Unit Corporation Annual Report 2017

Plain-text annual report

2017 Annual Report A Diversified Energy Company Corporate Profile Unit Corporation is a diversified energy company engaged through its subsidiaries in the exploration for and production of oil and natural gas, the acquisition of producing oil and natural gas properties, the contract drilling of onshore oil and natural gas wells, and the gathering and processing of natural gas. Unit’s common stock is traded on the New York Stock Exchange under the symbol “UNT”. REPLACED 300% OF 2017 PRODUCTION WITH NEW RESERVES CASPER OFFICE PITTSBURGH OFFICE DENVER OFFICE Mississippian Basin Anadarko Basin TULSA HEADQUARTERS OKLAHOMA CITY OFFICE Arkoma Basin Permian Basin Gulf Coast Basin HOUSTON OFFICE CONTRACT DRILLING OIL & NATURAL GAS MIDSTREAM Financial Information Year Ended December 31, ($ in thousands) Total Revenues Capital Expenditures 1 2017 739,640 327,211 $ $ 2016 602,177 186,713 $ $ $ $ 2015 2014 2013 854,231 $ 1,572,944 $ 1,351,850 561,632 $ 987,097 $ 703,984 Total Assets $ 2,581,452 $ 2,479,303 $ 2,799,842 $ 4,463,473 $ 4,010,546 Long-Term Debt $ 820,276 $ 800,917 $ 918,995 $ 801,908 $ 633,852 Shareholders’ Equity $ 1,345,560 $ 1,194,070 $ 1,313,580 $ 2,332,394 $ 2,173,392 Total Capitalization $ 2,165,836 $ 1,994,987 $ 2,232,575 $ 3,134,302 $ 2,807,244 1Capital expenditures (cash basis) including acquisitions. To Our Shareholders O ur outlook for 2017 was optimistic for continuing oil and gas price improvements. Improvement, we believed, would accelerate industry drilling and production levels, and our optimism was well placed. 2017 was marked by improvements and new successes for each of our three business segments. Our disciplined approach to addressing evolving economic conditions has well positioned us as we leave 2017 and look forward to 2018. In 2017, we said goodbye to some of our long-time leaders and hello to new future leaders. Notably, Michael Adcock was elected chairman of our Board of Directors with the retirement of John Nikkel. Brad Guidry, our Executive Vice President of Exploration, likewise, retired in March. With Brad’s departure, the board elected Frank Young to assume the role of Executive Vice President of Unit Petroleum Company. In August, David Merrill was named Chief Operating Officer after serving as our Chief Financial Officer for many years. David passed the role to Les Austin who joined the company as our Senior Vice President and Chief Financial Officer in November. To each of our departing friends, we say thank you for your many years of service and jobs well done. To the newest members of our leadership team—welcome, and we look forward to many years of strong contributions from each of you. Our oil and natural gas segment started the year facing the headwind of declining production because of our reduced drilling activity for much of 2016. With the prospect of increased product prices for 2017, we were able to increase this segment’s budget while keeping it in line with our expected cash flow for the year. Although confined by the limit of anticipated cash flow, this segment performed very well for the year. The production declines resulting from 2016 were reversed by the second quarter and our production growth continued through the balance of the year. Comparatively, first quarter 2017 average daily production was 41,970 Boe while fourth quarter 2017 was 46,848 Boe, an increase of 12%. We also replaced our production for the year by 300% with new oil and gas reserves, far surpassing our goal of replacing at least 150% of each year’s production with new reserves. Year-end 2017 total proved oil and natural gas reserves increased 27% over 2016. Contributing to our oil and natural gas segment’s results was an opportunistic acquisition we made in our core Hoxbar play and our legacy STACK and STACK Extension position we announced during the year. These additions improved our inventory of potential drilling locations providing us with further growth opportunities. The overall results we are experiencing from our wells drilled in our three core areas compare favorably with other active basins in the lower 48. Our oil and natural gas segment’s 2018 capital expenditures budget is $272 million. This represents a 26% increase over 2017, excluding acquisitions. We anticipate production growth of 7 to 9% in 2018. Like our oil and gas segment, our contract drilling segment started the year coming off a difficult 2016. Drilling rig utilization reached a low of 13 operating rigs in May 2016. From there, things slowly improved and by the beginning of 2017 we were operating 21 drilling rigs. During 2017, we returned several idle rigs to service reaching a high of 36 operating rigs. Activity levels paused during the fourth quarter, and we ended the year with 31 operating rigs. Overall, average rig utilization for put our 10th BOSS drilling rig into service. All ten of our BOSS drilling rigs operated continuously in 2017, a testament to the quality design and performance of those drilling rigs. For 2018, our capital expenditures budget for our contract drilling segment is $47 million, an increase of 30% over 2017. This budget anticipates completing our 11th and possibly starting a 12th rig as encouraging BOSS drilling discussions continue with existing and potential new customers. Our midstream segment performed well during the year despite a limited capital budget. For the year, this segment had an operating profit (revenues less operating expenses) of $51.7 million, a new record and a 7% increase over 2016. Most of this segment’s margins are from fee based contractual arrangements; however, it continues to have ample exposure to commodity-based contracts allowing for a great deal of cash flow uplift potential as NGL prices improve. The midstream capital expenditures budget for 2018 is $32 million, a 44% increase over 2017. Overall, we were pleased with the results each of our three segments achieved in 2017. So far, early indications for 2018 give us reason to believe the momentum will continue. Our overall company capital expenditure plan for 2018 is in keeping with our anticipated cash flow for the year. We will continue to guide the company in a manner consistent with the best interests of you, our stockholders, our customers, and our employees. Larry D. Pinkston Chief Executive Officer & President David T. Merrill Chief Operating Officer February 27, 2018 2017 increased 72% from 2016. Our proprietary BOSS drilling rig program continues to succeed. At the end of 2016, we placed our ninth BOSS drilling rig into service, and in the second quarter of 2017, we 1 Oil & Natural Gas Segment One highlight of the year was our acquisition of certain oil and natural gas assets in Grady and Caddo Counties in western Oklahoma, which is in our core Hoxbar play, for $54.3 million. This acquisition consisted of estimated proved oil and gas reserves of 3.2 MMBoe (as of January 1, 2017, the effective date of the acquisition), approximately 8,300 net oil and gas leasehold acres, and 47 proved developed producing wells. This acquisition provided us with 13 additional potential horizontal drilling locations not otherwise included within our existing acreage. Of the acreage acquired, approximately 71% was held by production. We also received one gathering system as part of the transaction. In our Wilcox play, in southeast Texas, in Polk, Tyler, Hardin, and Goliad Counties, we completed six vertical and two horizontal wells in 2017. Seven wells were completed as gas/condensate producers and one as an oil producer. For 2017, annual production from our Wilcox play averaged 91 MMcfe per day (12% oil, 30% NGLs, 58% natural gas). We anticipate completing approximately eight vertical wells and two horizontal wells during 2018. In addition, we plan to complete approximately 13-15 behind pipe gas and liquids zones. In our Southern Oklahoma Hoxbar Oil Trend (SOHOT) area, in Grady County, Oklahoma, we completed six horizontal oil wells in the Marchand zone of the Hoxbar interval. We anticipate completing approximately nine horizontal Marchand wells in our SOHOT play during 2018 with six being extended laterals. In our Texas Panhandle Granite Wash play, we completed six extended lateral horizontal gas/condensate wells in our Buffalo Wallow field. Annual production from the Texas Panhandle averaged 86.5 MMcfe per day (10% oil, 38% NGLs, 52% natural gas). We anticipate completing approximately 11 extended lateral Granite Wash horizontal wells in our Buffalo Wallow field during 2018. D uring the year, we produced liquids 16.0 MMBoe, with (oil and NGLs) production representing 47% of our total equivalent production. Our production growth started slowly as we overcame the decrease in production from the lack of drilling in 2016 and accelerated through the rest of the year. Our fourth quarter production grew 6% over that of the third quarter, representing three consecutive quarters of production growth. Importantly, we accomplished that growth while maintaining our capital expenditures in line with our cash flow. Our year-end 2017 total estimated proved reserves were 149.8 MMBoe, or 898.6 Bcfe, an increase of 27% over 2016. Of our total proved reserves, 75% are proved developed. Estimated proved reserves were 13% oil, 30% NGLs, and 57% natural gas. In 2017, we exceeded our annual goal of replacing at least 150% of each year’s production with new reserves and replaced 300% of production. Our 2017 oil and natural gas revenues increased 22% to $357.7 million. Our average commodity prices for the year were $2.46 for natural gas, $49.44 for oil and $18.35 for NGLs, reflecting an increase over 2016 of 19%, 22%, and 63%, respectively. PROVED OIL & NATURAL GAS RESERVES INCREASED 27% OVER 2016 2 Contract Drilling Segment D uring 2017, we placed our tenth BOSS drilling rig into service. The BOSS drilling rig is a proprietary rig design we began building in 2013. It is a 1,500 horsepower, high-spec AC drilling rig that combines the best technological innovations from high-tech drilling rig designs into a single unique drilling rig that meets the increasing technical demands of our customers. The BOSS rig fits all definitions of a super-spec or pad-optimal rig by industry standards. One feature that separates the BOSS rig from the rest of our competitors is our 2200 HP quintuplex mud pumps. Using two quintuplex pumps on each BOSS rig exceeds the operating capability and performance of rigs equipped with three conventional triplex mud pumps. Another of its design features allows for a quick assembly substructure which allows moving the drilling rig to a new location in fewer loads. Both features provide our operators increased efficiency and reduce their overall cost on a well. Our contract drilling segment’s performance for the year was good. All ten BOSS rigs worked full time during 2017. Equally important is that we returned to service 14 of our SCR rigs during the year, which allowed us to take advantage of the increased drilling rig market activity. After reaching 36 operating rigs during the third quarter, utilization pared back slightly as operators approached the limits of their 2017 capital budgets. We exited 2017 with 31 active rigs, and we have 32 drilling rigs now operating under contract. We have nine long-term contracts with original terms ranging from six months to two years. Eight are up for renewal in 2018, and one in 2019. For the year, our drilling revenues increased 43% over 2016 to $174.7 million. Our average number of drilling rigs working during 2017 was 30.0 compared to 17.4 for 2016. ALL 10 BOSS RIGS OPERATED CONTINUOUSLY UNDER CONTRACT DURING THE YEAR At year-end, our drilling rig fleet totaled 95 drilling rigs, up one rig from the beginning of the year with the addition of the tenth BOSS drilling rig we built and placed into service. Our rig fleet is in varying geographic areas with 20 drilling rigs in our Rocky Mountain operations and 75 in our Mid-Continent operations. The maximum depth capacities of our various drilling rigs range from 9,500 to 40,000 feet. 3 MIDSTREAM SEGMENT REVENUE INCREASED OVER 201611% Midstream Segment R evenues for this segment for 2017 increased 11% over 2016 to $207.2 million. During the fourth quarter, liquids sold and gas processed volumes for our midstream segment increased 10% and 6%, respectively. Our customer base consists of mainly independent producers in Oklahoma, Texas, Kansas, Pennsylvania, and West Virginia. We operate three gas treatment plants, 13 natural gas processing plants, 22 active gathering systems, and approximately 1,455 miles of pipeline. Our Cashion processing facility capacity in central Oklahoma is approximately 45 MMcf per day. During 2017, we connected 12 new wells from three producers. We are undertaking an extension of the system on behalf of a producer scheduled to actively drill in this area in 2018. So far we have connected four new wells from this producer and anticipate connecting several more wells throughout 2018. As volume increases on this system, we will evaluate the need to add additional processing capacity. At our Hemphill processing facility in the Texas panhandle, our total production of natural gas liquids increased to 188,600 gallons per day. During 2017, we connected six new wells to this processing system with several more wells scheduled to be connected in the first part of 2018. We have completed construction of the pipeline to connect the next well pad, and we are upgrading our compression facilities to handle the expected additional volume. During 2017, we connected 14 new wells to our Bellmon processing facility in the Mississippian play in North Central Oklahoma. We have two processing skids available that provide total processing capacity of 90 MMcf per day. Our Segno gathering facility in Southeast Texas can gather and dehydrate approximately 120 MMcf per day. During 2017, we connected three new wells to the system along with additional volume from existing well recompletions. In the Appalachian region, we continue to connect new well pads to our Pittsburgh Mills gathering system. During 2017, we added one new well pad with five new wells. We are constructing a new pipeline to connect the next well pad. Most of the preliminary environmental and permitting activities are completed, and we have obtained the necessary right of way. Construction of this new pipeline will start in the first quarter of 2018 with completion expected during the third quarter. This well pad is anticipated to have seven wells drilled, and we should receive gas from this pad by the end of 2018. The producer has indicated that it also plans to drill seven new infill wells on existing pads during 2018. 4 Operational Highlights Year Ended December 31 ($ in thousands except average price amounts) Proved Oil and Natural Gas Reserves Discounted at 10% (Before Income Taxes) Proved Oil and Natural Gas Reserves Discounted at 10% (After Income Taxes) Total Estimated Proved Reserves Natural Gas (MMcf) Oil (MBbl) Natural Gas Liquids (MBbl) Equivalent (MBoe) Production: Natural Gas (MMcf) Oil (MBbl) Natural Gas Liquids (MBbl) Equivalent (MBoe) Average Price: Natural Gas (Per Mcf) Oil (Per Bbl) Natural Gas Liquids (Per Bbl) Equivalent (Boe) Well Data: Wells Drilled Wells Completed Success Rate 2017 2016 2015 2014 2013 $ 897,525 $ 575,176 $ 690,693 $ 2,099,789 $ 1,791,903 $ 807,170 $ 518,210 $ 589,486 $ 1,435,744 $ 1,225,976 508,650 405,579 484,868 646,961 581,784 19,513 45,486 15,696 34,482 16,735 37,687 22,667 48,529 21,765 41,205 149,774 117,774 135,233 179,023 159,934 51,260 2,715 4,737 15,996 2.46 49.44 18.35 21.72 70 68 97% $ $ $ $ 55,735 2,974 5,014 17,277 2.07 40.50 11.26 16.92 21 21 100% $ $ $ $ 65,546 3,783 5,274 19,982 2.63 50.79 10.12 20.92 58 56 97% $ $ $ $ 58,854 3,844 4,628 18,281 3.92 89.43 30.95 39.25 186 181 97% $ $ $ $ 56,757 3,360 3,914 16,734 3.32 95.06 31.79 37.77 149 143 96% $ $ $ $ 2017 2016 2015 2014 2013 Producing Well Count: Gross Net Gross Net Gross Net Gross Net Gross Net Natural Gas 4,887 1,798 4,944 1,770 6,234 2,169 6,369 2,184 6,705 2,182 Oil Total 1,554 633 1,574 635 1,627 650 1,752 663 2,991 599 6,441 2,431 6,518 2,405 7,861 2,819 8,121 2,847 9,696 2,781 Contract Drilling Operations Data: Number of Drilling Rigs Available for Use at Year End Wells Drilled Total Footage Drilled (Feet in 1,000’s) Average Number of Drilling Rigs Utilized Midstream Operations Data: 2017 2016 2015 2014 2013 95 468 6,864 30.0 94 358 5,112 17.4 94 516 7,237 34.7 89 894 121 793 12,551 10,578 75.4 65.0 Natural Gas Gathered (Mcf/Day) 385,209 419,217 353,771 319,348 309,554 Natural Gas Processed (Mcf/Day) 137,625 155,461 182,684 161,282 140,584 Liquids Sold (Gallons/Day) 534,140 536,494 577,513 733,406 543,602 5 FORM 10-K 6 Table of ContentsUNITED STATESSECURITIES AND EXCHANGE COMMISSIONWASHINGTON, D.C. 20549FORM 10-KANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THESECURITIES EXCHANGE ACT OF 1934For the fiscal year ended December 31, 2017ORTRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THESECURITIES EXCHANGE ACT OF 1934For the transition period from to Commission file number: 1-9260UNIT CORPORATION(Exact name of registrant as specified in its charter)Delaware73-1283193(State or other jurisdiction of incorporation or organization)(I.R.S. Employer Identification No.)8200 South Unit Drive, Tulsa, Oklahoma74132(Address of principal executive offices)(Zip Code)(Registrant’s telephone number, including area code) (918) 493-7700Securities registered pursuant to Section 12(b) of the Act:Title of each className of each exchange on which registeredCommon Stock, par value $.20 per shareNYSESecurities registered pursuant to Section 12(g) of the Act: NoneIndicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes [x] No [ ]Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Exchange Act. Yes [ ] No [x]Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (orfor such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes [x] No [ ]Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and postedpursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes[x] No [ ]Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, indefinitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. [x]Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “largeaccelerated filer”, “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.Large accelerated filer [ x ] Accelerated filer [ ] Non-accelerated filer (Do not check if a smaller reporting company) [ ]Smaller reporting company [ ] Emerging growth company [ ]If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accountingstandards provided pursuant to Section 13(a) of the Exchange Act. [ ] Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act) Yes [ ] No [x]As of June 30, 2017 , the aggregate market value of the voting and non-voting common equity (based on the closing price of the stock on the NYSE on June 30, 2017 ) held by non-affiliates was approximately $958,140,471 . Determination of stock ownership by non-affiliates was made solely for the purpose of this requirement, and the registrant is not bound by thesedeterminations for any other purpose.Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.ClassOutstanding at February 13, 2018Common Stock, $0.20 par value per share53,061,832 sharesDOCUMENTS INCORPORATED BY REFERENCEDocumentParts Into Which IncorporatedPortions of the registrant’s definitive proxy statement (the Proxy Statement) with respect to its annual meeting of shareholders scheduled tobe held on May 2, 2018. The Proxy Statement will be filed within 120 days after the end of the fiscal year to which this report relates.Part IIIExhibit Index—See Page 122Table of ContentsFORM 10-KUNIT CORPORATIONTABLE OF CONTENTS Page PART I Item 1.Business1 Item 1A.Risk Factors22 Item 1B.Unresolved Staff Comments39 Item 2.Properties39 Item 3.Legal Proceedings39 Item 4.Mine Safety Disclosures40 PART II Item 5.Market for the Registrant’s Common Equity, Related Stockholder Matters, and Issuer Purchases of Equity Securities40 Item 6.Selected Financial Data42 Item 7.Management’s Discussion and Analysis of Financial Condition and Results of Operation43 Item 7A.Quantitative and Qualitative Disclosures about Market Risk71 Item 8.Financial Statements and Supplementary Data73 Item 9.Changes in and Disagreements with Accountants on Accounting and Financial Disclosure117 Item 9A.Controls and Procedures117 Item 9B.Other Information118 PART III Item 10.Directors, Executive Officers, and Corporate Governance118 Item 11.Executive Compensation120 Item 12.Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters121 Item 13.Certain Relationships and Related Transactions, and Director Independence121 Item 14.Principal Accountant Fees and Services121 PART IV Item 15.Exhibits and Financial Statement Schedules122Item 16.Form 10-K Summary125Signatures 126Table of ContentsDEFINITIONSThe following are explanations of some of the terms used in this report.ARO – Asset retirement obligations.ASC – FASB Accounting Standards Codification.ASU – Accounting Standards Update.Bcf – Billion cubic feet of natural gas.Bcfe – Billion cubic feet of natural gas equivalent. Determined using the ratio of one barrel of crude oil or NGLs to six Mcf of natural gas.Bbl – Barrel, or 42 U.S. gallons liquid volume.Boe – Barrel of oil equivalent. Determined using the ratio of six Mcf of natural gas to one barrel of crude oil or NGLs.BOKF – Bank of Oklahoma Financial Corporation.Btu – British thermal unit, used in gas volumes. Btu is used to refer to the amount of natural gas required to raise the temperature of one pound of water by one-degree Fahrenheit at one atmospheric pressure.Development drilling – The drilling of a well within the proved area of an oil or gas reservoir to the depth of a stratigraphic horizon known to be productive.DD&A – Depreciation, depletion, and amortization.FASB – Financial and Accounting Standards Board.Finding and development costs – Costs associated with acquiring and developing proved natural gas and oil reserves capitalized under generally acceptedaccounting principles, including any capitalized general and administrative expenses.Gross acres or gross wells – The total acres or wells in which a working interest is owned.IF – Inside FERC (U.S. Federal Energy Regulatory Commission).LIBOR – London Interbank Offered Rate.MBbls – Thousand barrels of crude oil or other liquid hydrocarbons.Mcf – Thousand cubic feet of natural gas.Mcfe – Thousand cubic feet of natural gas equivalent. Determined using the ratio of one barrel of crude oil or NGLs to six Mcf of natural gas.MMBbls – Million barrels of crude oil or other liquid hydrocarbons.MMBoe – Million barrels of oil equivalents.MMBtu – Million Btu’s.MMcf – Million cubic feet of natural gas.MMcfe – Million cubic feet of natural gas equivalent. Determined using the ratio of one barrel of crude oil or NGLs to six Mcf of natural gas.Net acres or net wells – The total fractional working interests owned in gross acres or gross wells.NGLs – Natural gas liquids.NYMEX – The New York Mercantile Exchange.Play – A term applied by geologists and geophysicists identifying an area with potential oil and gas reserves.Table of ContentsDEFINITIONS — (Continued)Producing property – A natural gas or oil property with existing production.Proved developed reserves – Reserves expected to be recovered through existing wells with existing equipment and operating methods or in which the cost of therequired equipment is relatively minor compared to the cost of a new well; and through installed extraction equipment and infrastructure operational at the time ofthe reserves estimate. For additional information, see the SEC’s definition in Rule 4-10(a)(3) of Regulation S-X.Proved reserves – Proved oil and gas reserves are those quantities of oil and gas, which, by analysis of geosciences and engineering data, can be estimated withreasonable certainty to be economically producible – from a given date forward, from known reservoirs and under existing economic conditions, operatingmethods, and government regulations – before the time when the contracts providing the right to operate expire, unless evidence indicates that renewal isreasonably certain, regardless of whether deterministic or probabilistic methods are used for the estimation. The project to extract the hydrocarbons must havecommenced or the operator must be reasonably certain that it will commence the project within a reasonable time. For additional information, see the SEC’sdefinition in Rule 4-10(a)(2)(i) through (iii) of Regulation S-X.Proved undeveloped reserves – Proved reserves expected to be recovered from new wells on undrilled acreage, or from existing wells where a relatively majorexpenditure is required for recompletion. For additional information, see the SEC’s definition in Rule 4-10(a)(4) of Regulation S-X.Reasonable certainty (regarding reserves) – If deterministic methods are used, reasonable certainty means high confidence that the quantities will be recovered. Ifprobabilistic methods are used, there should be at least a 90% probability that the quantities recovered will equal or exceed the estimate.Reliable technology – A grouping of one or more technologies (including computational methods) that has been field tested and has been demonstrated to providereasonably certain results with consistency and repeatability in the formation being evaluated or in an analogous formation.SARs – Stock appreciation rights.Unconventional play – Plays targeting tight sand, carbonates, coal bed, or oil and gas shale reservoirs. The reservoirs tend to cover large areas and lack the readilyapparent traps, seals, and discrete hydrocarbon-water boundaries that typically define conventional reservoirs. These reservoirs generally require horizontal wellsand fracture stimulation treatments or other special recovery processes to produce economically.Undeveloped acreage – Lease acreage on which wells have not been drilled or completed to a point that would permit the production of economic quantities ofnatural gas or oil regardless of whether the acreage contains proved reserves.Well spacing – The regulation of the number and location of wells over an oil or gas reservoir, as a conservation measure. Well spacing is normally accomplishedby order of the appropriate regulatory conservation commission.Workovers – Operations on a producing well to restore or increase production.WTI – West Texas Intermediate, the benchmark crude oil in the United States.Table of ContentsUNIT CORPORATIONAnnual ReportFor The Year Ended December 31, 2017PART IItem 1. BusinessUnless otherwise indicated or required by the context, the terms “Company”, “Unit”, “us”, “our”, “we”, and “its” refer to Unit Corporation or, as appropriate,one or more of its subsidiaries.Our executive offices are at 8200 South Unit Drive, Tulsa, Oklahoma 74132; our telephone number is (918) 493-7700.Information regarding our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and any amendments to these reports,will be provided free in print to any shareholders who request them. They are also available on our internet website at www.unitcorp.com , as soon as reasonablypracticable after we electronically file these reports with or furnish them to the Securities and Exchange Commission (SEC). Materials we file with the SEC maybe read and copied at the SEC’s Public Reference Room at 100 F. Street, N.E. Room 1580, N.W., Washington, D.C. 20549. Information on the operation of thePublic Reference Room may be obtained by calling the SEC at 1-800-SEC-0330. The SEC also maintains an Internet website at www.sec.gov that contains reports,proxy and information statements, and other information about us that we file electronically with the SEC.In addition, we post on our Internet website, www.unitcorp.com , copies of our corporate governance documents. Our corporate governance guidelines andcode of ethics, and the charters of our Board’s Audit, Compensation, and Nominating and Governance Committees, are available for free on our website or in printto any shareholder who requests them. We may occasionally provide important disclosures to investors by posting them in the investor information section of ourwebsite, as allowed by SEC rules.GENERALWe were founded in 1963 as an oil and natural gas contract drilling company. Today, besides our drilling operations, we have operations in the explorationand production and mid-stream areas. We operate, manage, and analyze our results of operations through our three principal business segments:•Oil and Natural Gas – carried out by our subsidiary Unit Petroleum Company. This segment explores, develops, acquires, and produces oil and naturalgas properties for our own account.•Contract Drilling – carried out by our subsidiary Unit Drilling Company. This segment contracts to drill onshore oil and natural gas wells for others andfor our own account.•Mid-Stream – carried out by our subsidiary Superior Pipeline Company, L.L.C. and its subsidiaries. This segment buys, sells, gathers, processes, andtreats natural gas for third parties and for our own account.Each company may conduct operations through subsidiaries of its own.1Table of ContentsThis table provides certain information about us as of February 13, 2018 :Oil and Natural Gas Completed gross wells in which we own an interest6,375Contract Drilling Number of drilling rigs available for use95Mid-Stream Number of natural gas treatment plants we own3Number of processing plants we own13Number of natural gas gathering systems we own (1)22_________________________ (1) In 2018, two gathering systems were transferred to our oil and natural gas segment.2017 SEGMENT OPERATIONS HIGHLIGHTSOil and Natural Gas•Acquired certain oil and natural gas assets located primarily in Grady and Caddo Counties in western Oklahoma for approximately $54.3 million.•Total year-end 2017 proved oil and natural gas reserves increased 27% over 2016.•Replaced 300% of 2017 production with new reserves.•Sold non-core assets with proceeds of $18.6 million.Contract Drilling•Utilization cycle during 2017:◦Started year with 21 drilling rigs operating;◦Placed one new BOSS drilling rig into service at the end of the second quarter;◦Returned to service 14 SCR drilling rigs and by mid-July had 36 drilling rigs operating; and◦Exited year with 31 drilling rigs operating, following weaker commodity prices in the third quarter and with commodity prices beginning toimprove late in the year.•All ten BOSS drilling rigs were operating during the year.Mid-Stream•Record operating profit (revenue less operating expense) of $51.7 million, a 7% increase over 2016.•Connected five wells to our Pittsburgh Mills gathering system resulting in increased gathered volume of up to 141 MMcf per day.•Began construction on a $14.0 million pipeline and compressor expansion project at our Cashion facility to allow us to gather and process productionfrom a new producer with a significant acreage dedication.•Connected three new wells to our Segno gathering system increasing our gathered volumes to a record high of 98.2 MMcf per day.•Connected six new wells to our Hemphill facility and upgraded compression facilities to handle expected higher volumes in the Buffalo Wallow area.FINANCIAL INFORMATION ABOUT SEGMENTSSee Note 16 of our Notes to Consolidated Financial Statements in Item 8 of this report for information regarding each of our segment’s revenues, profits orlosses, and total assets.2Table of ContentsOIL AND NATURAL GASGeneral. All our oil and natural gas properties are in the United States. Our producing oil and natural gas properties, unproved properties, and related assetsare in these locations:DivisionLocationWest divisionWestern and Southern Texas, Colorado, Wyoming, Montana, North Dakota, New Mexico, Southern Louisiana, andUtahEast divisionEastern Oklahoma and ArkansasCentral divisionWestern Oklahoma, Texas Panhandle, and KansasWhen we are the operator of a property, we attempt to use a drilling rig owned by our contract drilling segment, and we use our mid-stream segment togather our gas if it is economical for us to do so.This table presents certain information regarding our oil and natural gas operations as of December 31, 2017 :Our Divisions/AreaNumberofGrossWells Numberof NetWells Numberof GrossWells inProcess Numberof NetWells inProcess 2017 AverageNet Daily Production NaturalGas(Mcf) Oil(Bbls) NGLs (Bbls)West division1,163 430.75 — — 54,450 1,921 4,875East division192 105.00 — — 6,195 10 —Central division5,109 1,905.18 10 3.11 79,792 5,508 8,104Total6,464 2,440.93 10 3.11 140,437 7,439 12,979As of December 31, 2017 , we had no significant water floods, pressure maintenance operations, or any other material related activities that were in process.Description and Location of Our Core OperationsWest division. In our Wilcox play, located primarily in Polk, Tyler, Hardin, and Goliad Counties, Texas, we completed six vertical and two horizontal wells(average working interest 94.3%) in 2017. Seven wells were completed as gas/condensate producers and one well as an oil producer. Annual production from ourWilcox play averaged 91 MMcfe per day (12% oil, 30% NGLs, 58% natural gas) which is a decrease of approximately 4% compared to 2016. We averagedapproximately 0.5 Unit drilling rigs operating during 2017 and we plan to use approximately 0.8 Unit drilling rigs operating during 2018. We anticipate completingapproximately eight vertical wells and two horizontal wells during 2018. In addition, we plan to complete approximately 13 behind pipe gas and liquids zones.Central division. In our Southern Oklahoma Hoxbar Oil Trend (SOHOT) play, in western Oklahoma primarily in Grady County, we completed six horizontaloil wells (average working interest 88.8%) in the Marchand zone of the Hoxbar interval. Annual production from western Oklahoma averaged 60.5 MMcfe per day(29% oil, 22% NGLs, 49% natural gas) which is a decrease of approximately 7% compared to 2016. During 2017, we averaged approximately 0.75 Unit drillingrigs operating and we currently plan to use approximately one Unit drilling rigs operating during 2018. We anticipate completing approximately nine horizontalMarchand wells in our SOHOT play during 2018 with six being extended laterals.Also in Oklahoma, we intend to utilize 0.75 Unit drilling rigs throughout 2018 between our Western STACK and Red Fork plays. We anticipate completingone horizontal Osage, two extended lateral horizontal Meramec, one standard length horizontal Meramec, and two horizontal Red Fork wells.In our Texas Panhandle Granite Wash play, we completed six extended lateral horizontal gas/condensate wells (average working interest 99%) in our BuffaloWallow field. Annual production from the Texas Panhandle averaged 86.5 MMcfe per day (10% oil, 38% NGLs, 52% natural gas) which is a decrease ofapproximately 8% compared to 2016. We used one Unit drilling rig during 2017 and plan to continue using that rig during 2018. We anticipate completingapproximately 11 extended lateral Granite Wash horizontal wells in our Buffalo Wallow field during 2018.3Table of ContentsIn our Mississippian play in south central Kansas, we completed one horizontal oil well (working interest 100%). Annual production from Kansas averaged7.3 MMcfe per day (60% oil, 11% NGLs, 29% natural gas) which is an increase of approximately 18% compared to 2016.East division. Over the last several years, activity in our East division has been limited due to low gas prices since this area rarely has oil or NGLs associatedwith the gas. We drilled no wells in this division during 2017.Dispositions. We had non-core asset sales, net of related expenses, of $18.6 million , $67.2 million , and $1.9 million , in 2017 , 2016 , and 2015 ,respectively. Proceeds from these sales reduced the net book value of the full cost pool with no gain or loss recognized.During prior years, we determined the value of certain of our unproved oil and gas properties were diminished (in part or in whole) based on an impairmentevaluation and our anticipated future exploration plans. Those determinations resulted in $114.4 million , $7.6 million , and $10.5 million in 2015 , 2016 , and2017, respectively of costs being added to the total of our capitalized costs being amortized. We incurred a $1.6 billion pre-tax ( $1.0 billion net of tax) non-cashceiling test write-down of our oil and natural gas properties in 2015 due to a reduction of the 12-month average commodity prices during the year and including theimpaired value of those unproved properties. In 2016 , we incurred non-cash ceiling test write-downs of our oil and natural gas properties of $161.6 million pre-tax( $100.6 million net of tax) primarily due to the reduction of the 12-month average commodity prices during the first three quarters of the year. We had no ceilingtest write-downs for 2017.4Table of ContentsWell and Leasehold Data. The following tables identify certain information regarding our oil and natural gas exploratory and development drillingoperations: Year Ended December 31, 2017 2016 2015 Gross Net Gross Net Gross NetWells drilled: Development: Oil: West division1 1.00 — — 2 0.66East division— — — — — —Central division44 9.98 9 3.57 21 8.12Total oil45 10.98 9 3.57 23 8.78Natural gas: West division7 6.55 4 3.98 15 13.50East division— — — — — —Central division16 7.35 7 1.12 18 11.50Total natural gas23 13.90 11 5.10 33 25.00Dry: West division2 0.83 — — 1 1.00East division— — — — — —Central division— — — — 1 0.21Total dry2 0.83 — — 2 1.21Total development70 25.71 20 8.67 58 34.99Exploratory: Oil: West division— — 1 1.00 — —East division— — — — — —Central division— — — — — —Total oil— — 1 1.00 — —Natural gas: West division— — — — — —East division— — — — — —Central division— — — — — —Total natural gas— — — — — —Dry: West division— — — — — —East division— — — — — —Central division— — — — — —Total dry— — — — — —Total exploratory— — 1 1.00 — —Total wells drilled70 25.71 21 9.67 58 34.995Table of Contents Year Ended December 31, 2017 2016 (1) 2015 Gross Net Gross Net Gross NetWells producing or capable ofproducing: Oil: West division602 124.39 648 136.59 692 149.34East division11 — 18 0.72 28 1.79Central division941 508.46 908 497.25 907 498.75Total oil1,554 632.85 1,574 634.56 1,627 649.88Natural gas: West division546 298.97 582 296.71 659 325.57East division179 104.64 181 105.85 1,358 466.22Central division4,162 1,394.05 4,181 1,367.87 4,217 1,376.94Total natural gas4,887 1,797.66 4,944 1,770.43 6,234 2,168.73Total6,441 2,430.51 6,518 2,404.99 7,861 2,818.61_________________________ (1)During 2016, we had divestitures of 1,300 gross (407.70 net) wells. There were no significant divestitures in 2017 or 2015.As of February 13, 2018 , we were drilling or participating in 12 gross ( 4.22 net) wells started during 2018 .Cost for development drilling includes $41.6 million , $2.5 million , and $58.6 million in 2017 , 2016 , and 2015 , respectively, to develop previously bookedproved undeveloped oil and natural gas reserves.This table summarizes our leasehold acreage at December 31, 2017 : Year Ended December 31, 2017 Developed Undeveloped Total Gross Net Gross Net (1) Gross NetWest division254,887 81,989 74,387 58,608 329,274 140,597East division88,278 23,717 3,349 2,190 91,627 25,907Central division901,570 425,462 91,843 52,868 993,413 478,330Total1,244,735 531,168 169,579 113,666 1,414,314 644,834_________________________ (1)Approximately 70% (West – 76%; East – 95%; and Central – 61%) of the net undeveloped acres are covered by leases that will expire in the years 2018—2020 unless drilling orproduction extends the terms of those leases. Currently, we do not have any material proved undeveloped (PUD) reserves attributable to acreage where the expiration date precedes thescheduled PUD reserve development plan.6Table of ContentsPrice and Production Data. The following tables identify the average sales price, production volumes, and average production cost per equivalent barrel forour oil, NGLs, and natural gas production for the years indicated: Year Ended December 31, 2017 2016 2015Average sales price per barrel of oil produced: Price before derivatives$48.98 $39.05 $45.04Effect of derivatives0.46 1.45 5.75Price including derivatives$49.44 $40.50 $50.79Average sales price per barrel of NGLs produced: Price before derivatives$18.35 $11.26 $10.12Effect of derivatives— — —Price including derivatives$18.35 $11.26 $10.12Average sales price per Mcf of natural gas produced: Price before derivatives$2.49 $1.98 $2.25Effect of derivatives(0.03) 0.09 0.38Price including derivatives$2.46 $2.07 $2.637Table of Contents Year Ended December 31, 2017 2016 2015Oil production (MBbls): West division: Jazz Wilcox field533 589 422All other west division fields168 238 258Total west division701 827 680East division4 8 11Central division: Buffalo Wallow field127 120 145All other central division fields1,883 2,019 2,947Total central division2,010 2,139 3,092Total oil production2,715 2,974 3,783NGLs production (MBbls): West division: Jazz Wilcox field1,567 1,671 1,275All other west division fields212 216 266Total west division1,779 1,887 1,541East division— — 6Central division: Buffalo Wallow field728 592 724All other central division fields2,230 2,535 3,003Total central division2,958 3,127 3,727Total NGLs production4,737 5,014 5,274Natural gas production (MMcf): West division: Jazz Wilcox field16,799 18,145 14,538All other west division fields3,076 2,506 3,259Total west division19,875 20,651 17,797East division2,261 2,956 6,846Central division: Buffalo Wallow field6,228 5,506 6,895All other central division fields22,896 26,622 34,008Total central division29,124 32,128 40,903Total natural gas production51,260 55,735 65,546Total production (MBoe): West division: Jazz Wilcox field4,900 5,284 4,120All other west division fields893 872 1,067Total west division5,793 6,156 5,187East division381 500 1,158Central division: Buffalo Wallow field1,893 1,629 2,019All other central division fields7,929 8,992 11,618Total central division9,822 10,621 13,637Total production15,996 17,277 19,982Average production cost per equivalent Bbl (1)$5.86 $5.62 $7.06_______________________ (1)Excludes ad valorem taxes and gross production taxes.8Table of ContentsOur Buffalo Wallow field in Hemphill County, Texas, contained 24% , 13% , 10% of our total proved reserves in 2017 , 2016 , and 2015 , respectively,expressed on an oil equivalent barrels basis. Our Jazz Wilcox field in South Texas, which includes our Gilly, Segno, and Wildwood prospects and several smallerprospects, contained 18% , 26% , and 24% of our total proved reserves for those same years also expressed on an oil equivalent barrels basis. There are no otherfields that accounted for more than 15% of our proved reserves.Oil, NGLs, and Natural Gas Reserves. The following table identifies our estimated proved developed and undeveloped oil, NGLs, and natural gas reserves: Year Ended December 31, 2017 Oil(MBbls) NGLs (MBbls) NaturalGas(MMcf) TotalProvedReserves(MBoe)Proved developed: West division2,902 8,812 93,456 27,290East division— — 41,720 6,953Central division11,960 24,546 253,270 78,718Total proved developed14,862 33,358 388,446 112,961Proved undeveloped: West division329 1,220 12,255 3,592East division— — 1,394 232Central division4,322 10,908 106,555 32,989Total proved undeveloped4,651 12,128 120,204 36,813Total proved19,513 45,486 508,650 149,774Oil, NGLs, and natural gas reserves cannot be measured exactly. Estimates of those reserves require extensive judgments of reservoir engineering data andare generally less precise than other estimates made in financial disclosures. We use Ryder Scott Company L.P., (Ryder Scott), independent petroleum consultants,to audit the reserves prepared by our reservoir engineers. Ryder Scott has been providing petroleum consulting services throughout the world since 1937. Theirsummary report is attached as Exhibit 99.1 to this Form 10-K. The wells or locations for which reserve estimates were audited were taken from our reserve andincome projections as of December 31, 2017 , and comprised 83% of the total proved developed future net income discounted at 10% and 86% of the total proveddiscounted future net income (based on the SEC's unescalated pricing policy).Our Reservoir Engineering department is responsible for reserve determination for the wells in which we have an interest. Their primary objective is toestimate the wells' future reserves and future net value to us. Data is incorporated from multiple sources including geological, production engineering, marketing,production, land, and accounting departments. The engineers review this information for accuracy as it is incorporated into the reservoir engineering database. Ourinternal audit group reviews our internal controls to help provide assurance all the data has been provided. New well reserve estimates are provided to managementand the respective operational divisions for additional scrutiny. Major reserve changes on existing wells are reviewed regularly with the operational divisions toconfirm completeness and accuracy. As the external audit is being completed by Ryder Scott, the reservoir department performs a final review of all properties foraccuracy of forecasting.Technical QualificationsRyder Scott – Mr. Robert J. Paradiso was the primary technical person responsible for overseeing the estimate of the reserves, future production and incomeprepared by Ryder Scott.Mr. Paradiso, an employee of Ryder Scott since 2008, is a Vice President and serves as Project Coordinator, responsible for coordinating and supervisingstaff and consulting engineers in ongoing reservoir evaluation studies worldwide. Before joining Ryder Scott, Mr. Paradiso served in several engineering positionswith Getty Oil Company, Texaco, Union Texas Petroleum, Amax Oil and Gas, Inc., Norcen Explorer, Inc., Amerac Energy Corporation, Halliburton EnergyServices, Santa Fe Snyder Corp., and Devon Energy Corporation.9Table of ContentsMr. Paradiso earned a Bachelor of Science degree in Petroleum Engineering from Texas Tech University in 1979 and is a registered Professional Engineer inthe State of Texas. He is also a member of the Society of Petroleum Engineers (SPE).Besides gaining experience and competency through prior work experience, the Texas Board of Professional Engineers requires at least fifteen hours ofcontinuing education annually, including at least one hour in professional ethics, which Mr. Paradiso fulfills. As part of his 2017 continuing education hours, Mr.Paradiso attended 6 hours of formalized training during the 2017 RSC Reserves Conference relating to the definitions and disclosure guidelines in the UnitedStates Securities and Exchange Commission Title 17, Code of Federal Regulations, Modernization of Oil and Gas Reporting, Final Rule released January 14, 2009in the Federal Register. Mr. Paradiso attended an additional 37.5 hours of formalized in-house training during 2017 covering such topics as theSPE/WPC/AAPG/SPEE Petroleum Resources Management System, reservoir engineering, geoscience and petroleum economics evaluation methods, proceduresand software and ethics for consultants.Based on his educational background, professional training and over 38 years of practical experience in the estimation and evaluation of petroleum reserves,Mr. Paradiso has attained the professional qualifications as a Reserves Estimator and Reserves Auditor set forth in Article III of the “Standards Pertaining to theEstimating and Auditing of Oil and Gas Reserves Information” promulgated by the SPE as of February 19, 2007. For more information regarding Mr. Paradiso’sgeographic and job specific experience, please refer to the Ryder Scott Company website at http://www.ryderscott.com/Company/Employees.The Company – Responsibility for overseeing the preparation of our reserve report is shared by our reservoir engineers Trenton Mitchell and Derek Smith.Mr. Mitchell earned a Bachelor of Science degree in Petroleum Engineering from Texas A&M University in 1994. He has been an employee of Unit since2002. Initially, he was the Outside Operated Engineer and since 2003 he has served in the capacity of Reservoir Engineer and in 2010 he was promoted to Managerof Reservoir Engineering. Before joining Unit, he served in several engineering field and technical support positions with Schlumberger Well Services in theirpumping services segment (formerly Dowell Schlumberger). He obtained his Professional Engineer registration from the State of Oklahoma in 2004. He has been amember of SPE since 1991 and joined the Society of Petroleum Evaluation Engineers (SPEE) in 2017.Mr. Smith received a Bachelor of Science in Petroleum Engineering with a Minor in Business from the University of Tulsa in 2005. He worked for ApacheCorporation immediately after in Production Engineering, then Reservoir Engineering, followed by Drilling Engineering for approximately one year each beforemoving to Corporate Reserves in 2008. He joined Unit in 2009 as a Corporate Reserves Engineer involved in reserve evaluation, acquisition appraisals, andprospect reviews with increasing levels of responsibility. He has been a member of SPE since 2000.As part of their continuing education Mr. Mitchell and Mr. Smith have attended various seminars and forums to enhance their understanding of currentstandards and issues for reserves presentation. These forums have included those sponsored by various professional societies and professional service firmsincluding Ryder Scott.Definitions and Other. Proved oil, NGLs, and natural gas reserves, as defined in SEC Rule 4-10(a), are those quantities of oil and gas, which, by analysis ofgeoscience and engineering data, can be estimated with reasonable certainty to be economically producible – from a given date forward, from known reservoirsand under existing economic conditions, operating methods and government regulations – before the time the contracts providing the right to operate expire, unlessevidence indicates that renewal is reasonably certain, regardless of whether deterministic or probabilistic methods are used for estimation. The project to extract thehydrocarbons must have commenced or the operator must be reasonably certain that it will commence the project within a reasonable time.The area of the reservoir considered as "proved" includes:•The area identified by drilling and limited by any fluid contacts, and•Adjacent undrilled portions of the reservoir that can, with reasonable certainty, be judged to be continuous with it and to contain economicallyproducible oil or gas based on available geosciences and engineering data.Absent data on fluid contacts, proved quantities in a reservoir are limited by the lowest known hydrocarbons as incurred in a well penetration unlessgeosciences, engineering, or performance data and reliable technology establishes a lower contact with reasonable certainty.10Table of ContentsWhere direct observation from well penetrations has defined a highest known oil elevation and the potential exists for an associated gas cap, proved oilreserves may be assigned in the structurally higher portions of the reservoir only if geosciences, engineering, or performance data and reliable technology establishthe higher contact with reasonable certainty.Reserves which can be produced economically through application of improved recovery techniques (including, but not limited to, fluid injection) areincluded in the proved classification when:•Successful testing by a pilot project in an area of the reservoir with properties no more favorable than the reservoir as a whole;•The operation of an installed program in the reservoir or other evidence using reliable technology establishes reasonable certainty of the engineeringanalysis on which the project or program was based; and•The project has been approved for development by all necessary parties and entities, including governmental entities.Existing economic conditions include prices and costs at which economic producibility from a reservoir is to be determined. The price used is the average ofthe prices over the 12-month period before the ending date of the period covered by the report and is an unweighted arithmetic average of the first day of the monthprice for each month within the period, unless prices are defined by contractual arrangements, excluding escalations based on future conditions."Proved undeveloped" oil, NGLs, and natural gas reserves are proved reserves expected to be recovered from new wells on undrilled acreage, or fromexisting wells where a relatively major expense is required for completion. Reserves on undrilled acreage are limited to those directly offsetting developmentspacing areas reasonably certain of production when drilled, unless evidence using reliable technology exists that establishes reasonable certainty of economicproducibility at greater distances. Undrilled locations can be classified as having undeveloped reserves only if a development plan has been adopted indicating thatthey are scheduled to be drilled within five years, unless the specific circumstances, justify a longer time. Under no circumstances can estimates for provedundeveloped reserves be attributable to acreage for which an application of fluid injection or other improved recovery technique is contemplated, unless thosetechniques have been proved effective by actual projects in the same reservoir or an analogous reservoir, or by other evidence using reliable technologyestablishing reasonable certainty.Proved Undeveloped Reserves. As of December 31, 2017 , we had 99 gross proved undeveloped wells all of which we plan to develop within five years ofinitial disclosure at a net estimated cost of approximately $326.2 million . The future estimated development costs to develop our proved undeveloped oil andnatural gas reserves for the years 2018-2022, as disclosed in our December 31, 2017 oil and natural gas reserve report, are shown below:Year Number of Gross Wells Planned Estimated Net Development Cost(In millions)2018 35 $78.32019 36 152.22020 19 78.32021 9 17.42022 — — 99 $326.211Table of ContentsOur proved undeveloped reserves reported at December 31, 2017 did not include reserves we did not expect to develop within five years of initial disclosureof those reserves. Below is a summary of changes to our proved undeveloped reserves during 2017 : Oil(MMBbls) NGLs(MMBbls) Natural Gas(Bcf) Total(MMBoe)Proved undeveloped reserves, January 1, 20173.0 6.0 58.5 18.7Extensions and discoveries2.4 7.6 75.0 22.6Converted to developed(1.1) (1.1) (11.7) (4.2)Revisions of previous estimates(0.2) (0.7) (4.5) (1.7)Purchases of reserves0.6 0.3 2.9 1.4Proved undeveloped reserves, December 31, 20174.7 12.1 120.2 36.8During 2017 , we converted nine proved undeveloped well locations into proved developed wells at a cost of approximately $41.6 million . The increase inthe table above to our extensions and discoveries were due to a number of factors including increased drilling activity, higher commodity prices resulting in anincreased budget for future capital expenditures, all contributing to more wells being economic to develop in the next five years.Our estimated proved reserves and the standardized measure of discounted future net cash flows of the proved reserves at December 31, 2017 , 2016 , and2015 , the changes in quantities, and standardized measure of those reserves for the three years then ended, are shown in the Supplemental Oil and Gas Disclosuresin Item 8 of this report.Contracts. Our oil production is sold at or near our wells under purchase contracts at prevailing prices under arrangements customary in the oil industry. Ournatural gas production is sold to intrastate and interstate pipelines and to independent marketing firms under contracts with terms generally ranging from onemonth to a year. Few of these contracts contain provisions for readjustment of price as most are market sensitive.Customers. During 2017 , sales to Sunoco Logistics accounted for 10% of our oil and natural gas revenues. No other company accounted for over 10% ofour oil and natural gas revenues besides our mid-stream segment. During 2017 , our mid-stream segment purchased $63.2 million of our natural gas and NGLsproduction and provided gathering and transportation services of $6.7 million . Intercompany revenue from services and purchases of production between our mid-stream segment and our oil and natural gas segment has been eliminated in our consolidated financial statements. In 2016 and 2015 , we eliminated intercompanyrevenues of $51.9 million and $65.2 million , respectively, attributable to the intercompany purchase of our production of natural gas and NGLs and gathering andtransportation services.CONTRACT DRILLINGGeneral. Our contract drilling business is conducted through Unit Drilling Company. Through this company we drill onshore oil and natural gas wells forour own account and for other oil and natural gas companies. Our drilling operations are in Oklahoma, Texas, Louisiana, Kansas, Colorado, Wyoming, and NorthDakota. Until October 31, 2015, our drilling operations in Texas were conducted under Unit Texas Drilling L.L.C., a subsidiary of Unit Drilling Company.Effective October 31, 2015, that subsidiary was merged into Unit Drilling Company.12Table of ContentsThis table identifies certain information about our contract drilling segment: Year Ended December 31, 2017 2016 2015Number of drilling rigs available for use at year end95.0 94.0 94.0Average number of drilling rigs owned during year94.5 93.9 92.6Average number of drilling rigs utilized30.0 17.4 34.7Utilization rate (1)32% 19% 38%Average revenue per day (2)$15,935 $19,154 $20,950Total footage drilled (feet in 1,000’s)6,864 5,112 7,237Number of wells drilled468 358 516_________________________(1)Utilization rate is determined by dividing the average number of drilling rigs used by the average number of drilling rigs owned during the year.(2)Represents the total revenues from our contract drilling segment divided by the total days our drilling rigs were used during the year.Description and Location of Our Drilling Rigs. An on-shore drilling rig is composed of major equipment components like engines, drawworks or hoists,derrick or mast, substructure, mud pumps, blowout preventers, top drives, and drill pipe. Because of the normal wear and tear from operating 24 hours a day,several of the major components, like engines, mud pumps, top drives, and drill pipe, must be replaced or rebuilt on a periodic basis. Other major components, likethe substructure, mast, and drawworks, can be used for extended periods of time with proper maintenance. We also own additional equipment used in operating ourdrilling rigs, including iron roughnecks, automated catwalks, skidding systems, large air compressors, trucks, and other support equipment. Our drilling rigs can betransferred between divisions.The maximum depth capacities of our various drilling rigs range from 9,500 to 40,000 feet allowing us to cover a wide range of our customers drillingrequirements. In 2017 , 36 of our 95 drilling rigs were used in drilling services.This table shows certain information about our drilling rigs (including their distribution) as of February 13, 2018 :DivisionsContractedRigs Non-ContractedRigs TotalRigs AverageRatedDrillingDepth(ft)Mid-Continent25 50 75 17,260Rocky Mountain6 14 20 19,925Totals31 64 95 17,821The cyclical nature of the contract drilling business is reflected in drilling rig utilization rates. Drilling rig utilization at the end of 2015 was 26 drilling rigs.Then in 2016, utilization bottomed out in May at 13 operating drilling rigs. As commodity prices improved during the remainder 2016, we exited the year with 21active drilling rigs. The increased rig activity continued on into 2017 as we added one new BOSS drilling rig and returned to service 14 SCR drilling rigs to peak at36 drilling rigs utilized in the third quarter. Following which commodity prices weakened during the third quarter and our active drilling rig count dropped to 27drilling rigs. However, commodity prices rebounded late in the year and we finished 2017 with 31 drilling rigs operating.Mid-Continent. The Mid-Continent division manages operations from Oklahoma, Texas, Louisiana, and Kansas. The division operated an average of 23.8drilling rigs during 2017. As of December 31, 2017, this division was operating 26 drilling rigs, 18 of which were working in Oklahoma and the Texas Panhandle,one in East Texas, and seven in the Permian Basin of West Texas.Rocky Mountains. Our Rocky Mountain division covers Colorado, Utah, Wyoming, Montana, and North Dakota. This vast area has produced severalconventional and unconventional oil and gas fields. This division operated an average of 6.2 drilling rigs during 2017. We had two drilling rigs operating inWyoming and three drilling rigs operating in the Bakken Shale of North Dakota at the end of 2017.13Table of ContentsThe number of drilling rigs we can work depends on several conditions besides demand, including the availability of qualified labor and the availability ofneeded drilling supplies and equipment. The impact of these conditions affects the utilization for our drilling rigs. Our average utilization rate for 2017, 2016, and2015 was 32%, 19%, and 38%, respectively.The following table shows the average number of our drilling rigs working by quarter for the years indicated: 2017 2016 2015First quarter25.5 20.6 50.1Second quarter28.8 13.5 30.7Third quarter34.6 16.0 31.2Fourth quarter31.2 19.5 27.2Drilling Rig Fleet. The following table summarizes the changes to our drilling rig fleet in 2017 . A more complete discussion of changes over the last threeyears follows the table:Drilling rigs available for use at January 1, 201794Drilling rigs constructed1Total drilling rigs available for use at December 31, 201795Dispositions, Acquisitions, and Construction. During 2015, we recorded a write-down on 31 of our drilling rigs and related equipment of approximately$8.3 million pre-tax based on the estimated market value for similar equipment from auctions sales. We then sold all 31 of these drilling rigs and some otherdrilling equipment to unaffiliated third parties. The proceeds from the sale of those assets, less costs to sell, was less than the $11.3 million net book value resultingin a loss of $7.3 million pre-tax.During 2015, five BOSS drilling rigs were constructed and placed into service for third-party operators.During December 2016, we sold an idle 1,500 horsepower SCR drilling rig to an unaffiliated third party. We also built and placed into service for a thirdparty operator our ninth BOSS drilling rig. This new BOSS rig was constructed using the long lead time components purchased in prior years.During 2017, we built our tenth BOSS drilling rig and placed it into service for a third party operator under a long term contract.Drilling Contracts. Our drilling contracts are generally obtained through competitive bidding on a well by well basis. Contract terms and payment rates varydepending on the type of contract used, the duration of the work, the equipment and services supplied, and other matters. We pay certain operating expenses,including the wages of our drilling rig personnel, maintenance expenses, and incidental drilling rig supplies and equipment. The contracts are usually subject toearly termination by the customer subject to the payment of a fee. Our contracts also contain provisions regarding indemnification against certain types of claimsinvolving injury to persons, property, and for acts of pollution. The specific terms of these indemnifications are negotiable on a contract by contract basis.The type of contract used determines our compensation. Contracts are generally one of three types: daywork; footage; or turnkey. Under a daywork contract,we provide the drilling rig with the required personnel and the operator supervises the drilling of the well. Our compensation is based on a negotiated rate to bepaid for each day the drilling rig is used. Footage contracts usually require us to bear some of the drilling costs besides providing the drilling rig. We are paid oncompletion of the well at a negotiated rate for each foot drilled. Under turnkey contracts we drill the well to a specified depth for a set amount and provide most ofthe required equipment and services. We bear the risk of drilling the well to the contract depth and are paid when the contract provisions are completed. We mayincur losses if we underestimate the costs to drill the well or if unforeseen events occur that increase our costs or result in losing the well. We had no footage orturnkey contracts in 2017 , 2016 , or 2015 . Because market demand for our drilling rigs and the desires of our customers determine the types of contracts we use,we cannot predict when and if a part of our drilling will be conducted under footage or turnkey contracts.The majority of our contracts are on a well-to-well basis, with the rest under term contracts. Term contracts range from six months to two years and the ratescan either be fixed throughout the term or allow for periodic adjustments.14Table of ContentsCustomers. During 2017 , QEP Resources, Inc. was our largest drilling customer accounting for approximately 26% of our total contract drilling revenues.Our work for this customer was under multiple contracts and our business was not substantially dependent on any of these individual contracts. None of theseindividual contracts were considered to be material. No other third party customer accounted for 10% or more of our contract drilling revenues.Our contract drilling segment also provides drilling services for our oil and natural gas segment. During 2017 , 2016 , and 2015 , our contract drillingsegment drilled 27 , 10 , and 38 wells, respectively, for our oil and natural gas segment, or 6% , 3% , and 7% , respectively, of the total wells drilled by our contractdrilling segment. Depending on the timing of the drilling services performed on our properties those services may be deemed, for financial reporting purposes, tobe associated with acquiring an ownership interest in the property. Revenues and expenses for these services are eliminated in our statement of operations, with anyprofit recognized reducing our investment in our oil and natural gas properties. The contracts for these services are issued under similar terms and rates as thecontracts signed with unrelated third parties. By providing drilling services for the oil and natural gas segment, we eliminated revenue of $13.4 million and $22.1million during 2017 and 2015 , respectively, from our contract drilling segment and eliminated the associated operating expense of $11.8 million and $18.3 millionduring 2017 and 2015 , respectively, yielding $1.6 million and $3.8 million during 2017 and 2015 , respectively, as a reduction to the carrying value of our oil andnatural gas properties. We eliminated no revenue or expenses in our contract drilling segment during 2016.MID-STREAMGeneral. Our mid-stream operations are conducted through Superior Pipeline Company, L.L.C. and its subsidiaries. Its operations consist of buying, selling,gathering, processing, and treating natural gas. It operates three natural gas treatment plants, 13 processing plants, 24 active gathering systems, and approximately1,455 miles of pipeline. Superior and its subsidiaries operate in Oklahoma, Texas, Kansas, Pennsylvania, and West Virginia.This table presents certain information regarding our mid-stream segment for the years indicated: Year Ended December 31, 2017 2016 2015Gas gathered—Mcf/day385,209 419,217 353,771Gas processed—Mcf/day137,625 155,461 182,684NGLs sold—gallons/day534,140 536,494 577,513Dispositions and Acquisitions. This segment had no significant dispositions or acquisitions during 2015, 2016, or 2017.Contracts. Our mid-stream segment provides its customers with a full range of gathering, processing, and treating services. These services are usuallyprovided to each customer under long-term contracts (more than one year), but we have some short-term contracts. Our customer agreements include these types ofcontracts:•Fee-Based Contracts. These contracts provide for a set fee for gathering, transporting, compressing, and treating services. Our mid-stream’s revenue is afunction of the volume of natural gas and is not directly dependent on the value of the natural gas. For the year ended December 31, 2017 , 71% of ourmid-stream segment’s total volumes and 62% of its operating margins (as defined below) were under fee-based contracts.•Commodity-Based Contracts. These contracts consist of several contract structure types. Under these contract structures, our mid-stream segmentpurchases the raw well-head natural gas and settles with the producer at a stipulated price while retaining all sales proceeds from third parties or retains anegotiated percentage of the sales proceeds from the residue natural gas and NGLs it gathers and processes, with the remainder being paid to theproducer. For the year ended December 31, 2017 , 29% of our mid-stream segment’s total volumes and 38% of operating margins (as defined below)were under commodity-based contracts.For each of the above contracts, operating margin is defined as total operating revenues less operating expenses and does not include depreciation,amortization, and impairment, general and administrative expenses, interest expense, or income taxes.Customers. During 2017 , ONEOK, Inc. accounted for approximately 36% of our mid-stream revenues. We believe that if we lost this customer, there areother customers available to purchase our gas and NGLs. During 2017 , 2016 , and 2015 this segment purchased $63.2 million , $42.7 million , and $57.6 million ,respectively, of our oil and natural gas segment's natural gas and NGLs production, and provided gathering and transportation services of $6.7 million , $9.2million , and $7.6 million ,15Table of Contentsrespectively. Intercompany revenue from services and purchases of production between this business segment and our oil and natural gas segment has beeneliminated in our consolidated financial statements.VOLATILE NATURE OF OUR BUSINESSThe prevailing prices for oil, NGLs, and natural gas significantly affect our revenues, operating results, cash flow and our ability to grow our operations. Oil,NGLs, and natural gas prices have been volatile and they will probably continue to be so. For each period indicated, this table shows the highest and lowestaverage prices our oil and natural gas segment received for its sales of oil, NGLs, and natural gas without considering the effect of derivatives: Oil Price per Bbl NGLs Price per Bbl Natural Gas Price per McfQuarterHigh Low High Low High Low2015 First$46.70 $43.22 $18.90 $1.60 $2.85 $2.30Second$54.37 $49.28 $15.41 $10.21 $2.50 $2.11Third$49.02 $40.36 $9.49 $7.81 $2.51 $2.17Fourth$42.21 $33.29 $12.81 $9.03 $2.12 $1.642016 First$31.49 $26.62 $9.49 $4.54 $1.86 $1.20Second$45.13 $36.63 $13.19 $8.61 $1.52 $1.36Third$41.75 $41.40 $14.95 $9.87 $2.48 $2.32Fourth$48.80 $42.71 $19.07 $12.14 $2.85 $2.252017 First$50.48 $46.85 $20.71 $15.04 $3.76 $2.14Second$48.73 $43.49 $15.33 $14.36 $2.95 $2.30Third$49.66 $44.54 $19.99 $16.17 $2.53 $2.04Fourth$57.38 $49.62 $22.39 $21.13 $2.58 $1.93Prices for oil, NGLs, and natural gas are subject to wide fluctuations in response to relatively minor changes in the actual or perceived supply of and demandfor oil and natural gas, market uncertainty, and many additional factors that are beyond our control, including:•political conditions in oil producing regions;•the ability of the members of the Organization of Petroleum Exporting Countries (OPEC) to agree on prices and their ability or willingness to maintainproduction quotas;•actions taken by foreign oil and natural gas producing nations;•the price of foreign oil imports;•imports and exports of oil and liquefied natural gas;•actions of governmental authorities;•the domestic and foreign supply of oil, NGLs, and natural gas;•the level of consumer demand;•United States storage levels of oil, NGLs, and natural gas;•weather conditions;•domestic and foreign government regulations;•the price, availability, and acceptance of alternative fuels;•volatility in ethane prices causing rejection of ethane as part of the liquids processed stream; and•worldwide economic conditions.16Table of ContentsThese factors and the volatile nature of the energy markets make it impossible to predict with any certainty the future prices of oil, NGLs, and natural gas.You are encouraged to read the Risk Factors discussed in Item 1A of this report for additional risks that can affect our operations.Our contract drilling operations depend on the level of demand in our operating markets. Both short-term and long-term trends in oil, NGLs, and natural gasprices affect demand. Because oil, NGLs, and natural gas prices are volatile, the level of demand for our services can also be volatile.Our mid-stream operations provide us greater flexibility in delivering our (and third parties) natural gas and NGLs from the wellhead to major natural gasand NGLs pipelines. Margins received for the delivery of these natural gas and NGLs depend on the price for oil, NGLs, and natural gas and the demand fornatural gas and NGLs in our area of operations. If the price of NGLs falls without a corresponding decrease in the cost of natural gas, it may become uneconomicalto us to extract certain NGLs. The volumes of natural gas and NGLs processed depend highly on the volume and Btu content of the natural gas and NGLs gathered.COMPETITIONAll of our businesses are highly competitive and price sensitive. Competition in the contract drilling business traditionally involves factors such as demand,price, efficiency, condition of equipment, availability of labor and equipment, reputation, and customer relations.Our oil and natural gas operations likewise encounter strong competition from other oil and natural gas companies. Many competitors have greater financial,technical, and other resources than we do and have more experience than we do in the exploration for and production of oil and natural gas.Our drilling success and the success of other activities integral to our operations will depend, in part, during times of increased competition on our ability toattract and retain experienced geologists, engineers, and other professionals. Competition for these professionals can be intense.Our mid-stream segment competes with purchasers and gatherers of all types and sizes, including those affiliated with various producers, other majorpipeline companies, and independent gatherers for the right to purchase natural gas and NGLs, build gathering and processing systems, and deliver the natural gasand NGLs once the gathering and processing systems are established. The principal elements of competition include the rates, terms, and availability of services,reputation, and the flexibility and reliability of service.OIL AND NATURAL GAS PROGRAMS AND CONFLICTS OF INTERESTUnit Petroleum Company serves as the general partner of 13 oil and gas limited partnerships (the employee partnerships) which were formed to allow certainof our qualified employees and our directors to participate in Unit Petroleum’s oil and gas exploration and production operations. Employee partnerships wereformed for each year beginning with 1984 and ending with 2011. We also had three non-employee partnerships, one formed in 1984 and two formed in 1986(investments by third parties). Effective December 31, 2014, the 1984 partnership was dissolved and effective December 31, 2016, the two 1986 partnerships weredissolved.The employee partnerships formed in 1984 through 1999 have been combined into a single consolidated partnership. The employee partnerships each have aset annual percentage (ranging from 1% to 15%) of our interest that the partnership acquires in most of the oil and natural gas wells we drill or acquire for our ownaccount during the year in which the partnership was formed. The total interest the participants have in our oil and natural gas wells by participating in thesepartnerships does not exceed one percent of our interest in the wells.Under our partnership agreements, the general partner has broad discretionary authority to manage the business and operations of the partnership, includingthe authority to decide regarding the partnership’s participation in a drilling location or a property acquisition, the partnership’s expenditure of funds, anddistributing funds to partners. Because the business activities of the limited partners and the general partner are different, conflicts of interest will exist and it isimpossible to entirely eliminate these conflicts. Additionally, conflicts of interest may arise when we are the operator of an oil and natural gas well and alsoprovide contract drilling services. In these cases, the drilling operations are conducted under drilling contracts containing terms comparable to those contained inour drilling contracts with non-affiliated operators. We believe we fulfill our responsibility to each contracting party and comply fully with the terms of theagreements which regulate these conflicts.17Table of ContentsThese partnerships are further described in Notes 2 and 10 to the Consolidated Financial Statements in Item 8 of this report.EMPLOYEESAs of February 13, 2018 , we had approximately 910 employees in our contract drilling segment, 262 employees in our oil and natural gas segment, 124employees in our mid-stream segment, and 79 in our general corporate area. None of our employees are members of a union or labor organization nor have ouroperations ever been interrupted by a strike or work stoppage. We consider relations with our employees to be satisfactory.GOVERNMENTAL REGULATIONSGeneral. Our business depends on the demand for services from the oil and natural gas exploration and development industry, and therefore our business canbe affected by political developments and changes in laws and regulations that control or curtail drilling for oil and natural gas for economic, environmental, orother policy reasons.Various state and federal regulations affect the production and sale of oil and natural gas. All states in which we conduct activities impose varyingrestrictions on the drilling, production, transportation, and sale of oil and natural gas. This discussion of certain laws and regulations affecting our operationsshould not be relied on as an exhaustive review of all regulatory considerations affecting us, due to the multitude of complex federal, state, and local regulations,and their susceptibility to change at any time by later agency actions and court rulings that may affect our operations.Natural Gas Sales and Transportation. Under the Natural Gas Act of 1938, the Federal Energy Regulatory Commission (FERC) regulates the interstatetransportation and the sale in interstate commerce for resale of natural gas. FERC’s jurisdiction over interstate natural gas sales has been substantially modified bythe Natural Gas Policy Act under which FERC continued to regulate the maximum selling prices of certain categories of gas sold in “first sales” in interstate andintrastate commerce. Effective January 1, 1993, however, the Natural Gas Wellhead Decontrol Act (the Decontrol Act) deregulated natural gas prices for all “firstsales” of natural gas. Because “first sales” include typical wellhead sales by producers, all natural gas produced from our natural gas properties is sold at marketprices, subject to the terms of any private contracts which may be in effect. FERC’s jurisdiction over interstate natural gas transportation is not affected by theDecontrol Act.Our sales of natural gas are affected by intrastate and interstate gas transportation regulation. Beginning in 1985, FERC adopted regulatory changes that havesignificantly altered the transportation and marketing of natural gas. These changes are intended by FERC to foster competition by, among other things,transforming the role of interstate pipeline companies from wholesale marketers of natural gas to the primary role of gas transporters. All natural gas marketing bythe pipelines must divest to a marketing affiliate, which operates separately from the transporter and in direct competition with all other merchants. Because of thevarious omnibus rulemaking proceedings in the late 1980s and the later individual pipeline restructuring proceedings of the early to mid-1990s, interstate pipelinesmust provide open and nondiscriminatory transportation and transportation-related services to all producers, natural gas marketing companies, local distributioncompanies, industrial end users, and other customers seeking service. Through similar orders affecting intrastate pipelines that provide similar interstate services,FERC expanded the impact of open access regulations to certain aspects of intrastate commerce.FERC has pursued other policy initiatives that affected natural gas marketing. Most notable are (1) the large-scale divestiture of interstate pipeline-ownedgas gathering facilities to affiliated or non-affiliated companies; (2) further development of rules governing the relationship of the pipelines with their marketingaffiliates; (3) the publication of standards relating to using electronic bulletin boards and electronic data exchange by the pipelines to make available transportationinformation timely and to enable transactions to occur on a purely electronic basis; (4) further review of the role of the secondary market for released pipelinecapacity and its relationship to open access service in the primary market; and (5) development of policy and promulgation of orders pertaining to its authorizationof market-based rates (rather than traditional cost-of-service based rates) for transportation or transportation-related services on the pipeline’s demonstration oflack of market control in the relevant service market.Because of these changes, independent sellers and buyers of natural gas have gained direct access to the particular pipeline services they need and can betterconduct business with a larger number of counter parties. These changes generally have improved the access to markets for natural gas while substantiallyincreasing competition in the natural gas marketplace. However, we cannot predict what new or different regulations FERC and other regulatory agencies mayadopt or what effect later regulations may have on production and marketing of natural gas from our properties.18Table of ContentsAlthough in the past Congress has been very active in the area of natural gas regulation as discussed above, the more recent trend has been for deregulationand the promotion of competition in the natural gas industry. In addition to “first sales” deregulation, Congress also repealed incremental pricing requirements andnatural gas use restraints previously applicable. There continually are legislative proposals pending in the Federal and state legislatures which, if enacted, wouldsignificantly affect the petroleum industry. It is impossible to predict what proposals might be enacted by Congress or the various state legislatures and what effectthese proposals might have on the production and marketing of natural gas by us. Similarly, and despite the trend toward federal deregulation of the natural gasindustry, whether or to what extent that trend will continue or what the ultimate effect will be on the production and marketing of natural gas by us cannot bepredicted.Oil and Natural Gas Liquids Sales and Transportation. Our sales of oil and natural gas liquids currently are not regulated and are at market prices. Theprices received from the sale of these products are affected by the cost of transporting these products to market. Much of that transportation is through interstatecommon carrier pipelines. Effective as of January 1, 1995, FERC implemented regulations generally grandfathering all previously approved interstatetransportation rates and establishing an indexing system for those rates by which adjustments are made annually based on the rate of inflation, subject to certainconditions and limitations. These regulations may increase the cost of transporting oil and natural gas liquids by interstate pipeline, although the annualadjustments could cause decreased rates in a given year. These regulations have generally been approved on judicial review. Every five years, FERC examines therelationship between the annual change in the index and the actual cost changes experienced by the oil pipeline industry and makes any necessary adjustment in theindex to be used during the ensuing five years. We cannot predict with certainty what effect the periodic review of the index by FERC will have on us.Exploration and Production Activities. Federal, state, and local agencies also have promulgated extensive rules and regulations applicable to our oil andnatural gas exploration, production, and related operations. The states we operate in require permits for drilling operations, drilling bonds, and filing reports aboutoperations and impose other requirements relating to the exploration of oil and natural gas. Many states also have statutes or regulations addressing conservationmatters including provisions for the unitization or pooling of oil and natural gas properties, the establishment of maximum rates of production from oil and naturalgas wells, and regulating spacing, plugging and, abandonment of such wells. The statutes and regulations of some states limit the rate at which oil and natural gasis produced from our properties. The federal and state regulatory burden on the oil and natural gas industry increases our cost of doing business and affects ourprofitability. Because these rules and regulations are amended or reinterpreted frequently, we cannot predict the future cost or impact of complying with these laws.Environmental.General. Our operations are subject to federal, state, and local laws and regulations governing protection of the environment. These laws and regulationsmay require acquisition of permits before certain of our operations may be commenced and may restrict the types, quantities, and concentrations of varioussubstances that can be released into the environment. Planning and implementation of protective measures must prevent accidental discharges. Spills of oil, naturalgas liquids, drilling fluids, and other substances may subject us to penalties and cleanup requirements. Handling, storage, and disposal of both hazardous and non-hazardous wastes are subject to regulatory requirements.The federal Clean Water Act, as amended by the Oil Pollution Act, the federal Clean Air Act, the federal Resource Conservation and Recovery Act, and theirstate counterparts, are the primary vehicles for imposition of such requirements and for civil, criminal, and administrative penalties and other sanctions forviolation of their requirements. In addition, the federal Comprehensive Environmental Response Compensation and Liability Act and similar state statutes imposestrict liability, without regard to fault or the legality of the original conduct, on certain classes of persons considered responsible for the release of hazardoussubstances into the environment. Such liability, which may be imposed for the conduct of others and for conditions others have caused, includes the cost ofremedial action and damages to natural resources.The EPA in 2015 established publicly owned treatment works (POTWs) effluent guidelines and standards for oil and gas extraction facilities which reflectedindustry best practices for unconventional oil and gas extraction facilities.The EPA and the U.S. Army Corp of Engineers (Army) in 2015 proposed a new expansive definition of the “waters of the United States,” which the UnitedStates Court of Appeals for the Sixth Circuit stayed nationally. On February 28, 2017, an Executive Order was issued and directed that the EPA and Army considerinterpreting the term “navigable waters” in a manner consistent with Justice Scalia’s opinion in Rapanos v. United States (2006). On March 6, 2017, the EPA andArmy announced their intention to review and rescind or revise the 2015 Clean Water Rule and on June 27, 2017 they issued a proposed rule and writtenrecommendations. On January 22, 2018, the United States Supreme Court in National Association of Manufacturers v.19Table of ContentsDepartment of Defense, et al. vacated the Sixth Circuit’s nationwide stay. As a result, on January 31, 2018, the EPA and Army issued a rule providing that the2015 definition of “waters of the United States” will not apply until two years following the date this rule is published in the Federal Register. In addition, Armyincludes wetlands within its definition of “waters of the United States.” In 2016, the United States Supreme Court in U.S. Army Corps of Engineers v. Hawkesheld that landowners can challenge in court an Army Corps of Engineers jurisdictional determination. It is anticipated this decision will provide landowners animportant tool in negotiating and resolving conflicts with federal agencies over the extent of wetlands on a property.Endangered Species Act. The federal Endangered Species Act, called the “ESA,” and analogous state laws regulate many activities, including oil and gasdevelopment, which could have an adverse effect on species listed as threatened or endangered under the ESA or their habitats. Designating previously unidentifiedendangered or threatened species could cause oil and natural gas exploration and production operators and service companies to incur additional costs or becomesubject to operating delays, restrictions or bans in affected areas, which impacts could adversely reduce drilling activities in affected areas. All three of ourbusiness segments could be subject to the effect of one or more species being listed as threatened or endangered within the areas of our operations. Numerousspecies have been listed or proposed for protected status in areas in which we provide or could undertake operations. The U.S. Fish and Wildlife Service and theNational Marine Fisheries in 2016 issued final revised definitions relating to impacts on critical habitats for potentially endangered species allowing exclusion ofcertain areas if they will not result in the extinction of the species. In 2017, the Western Governor’s Association issued a Policy Resolution calling on Congress toamend and reauthorize the ESA based upon seven broad goals to make the act more workable and understandable. In December 2017, the Interior Departmentannounced that it is working on possible changes to the ESA with the U.S. Fish and Wildlife Service to revise the regulations for listing endangered and threatenedspecies and for designation of critical habitat. The presence of protected species in areas where we provide contract drilling or mid-stream services or conductexploration and production operations could impair our ability to timely complete or carry out those services and, consequently, hurt our results of operations andfinancial position.Climate Change. Recent scientific studies have suggested that emissions of certain gases, commonly called “greenhouse gases,” or GHGs, may becontributing to warming of the Earth’s atmosphere. As a result there have been many regulatory developments, proposals or requirements, and legislativeinitiatives introduced in the United States (and other parts of the World) that are focused on restricting the emission of carbon dioxide, methane, and othergreenhouse gases.In 2007, the United States Supreme Court in Massachusetts, et al. v. EPA , held that carbon dioxide may be regulated as an “air pollutant” under the federalClean Air Act if it represents a health hazard to the public. On December 7, 2009, the U.S. Environmental Protection Agency (EPA) responded to theMassachusetts, et al. v. EPA decision and issued a finding that the current and projected concentrations of GHGs in the atmosphere threaten the public health andwelfare of current and future generations, and that certain GHGs from new motor vehicles and motor vehicle engines contribute to the atmospheric concentrationsof GHG and hence to the threat of climate change. In addition, the EPA issued a final rule, effective in December 2009, requiring the reporting of GHG emissionsfrom specified large (25,000 metric tons or more) GHG emission sources in the U.S., beginning in 2011 for emissions in 2010. During 2010, the EPA proposedrevisions to these reporting requirements to apply to all oil and gas production, transmission, processing, and other facilities exceeding certain emission thresholds.On May 12, 2016, the EPA issued three final rules that together will curb emissions of methane, smog-forming volatile organic compounds (VOCs) and toxic air-pollutants such as benzene from new, reconstructed and modified oil and natural gas sources, while providing greater certainty about Clean Air Act permittingrequirements for the industry. First, the EPA issued updates to the New Source Performance Standards (NSPS) for the oil and natural gas industry to addrequirements that the industry reduce emissions of GHGs and to cover additional equipment and activities in the oil and natural gas distribution chain by settingemissions limits for methane and to require owners/operators to find and repair methane and VOC leaks. Second, the EPA issued a source determination ruleregarding the EPA’s air permitting rules as they apply to the oil and natural gas industry. The EPA clarified when multiple pieces of equipment and activities mustbe deemed a single source for determining whether (i) major source Prevention of Significant Deterioration (PSD) and Nonattainment New Source Reviewrequirements apply regarding preconstruction permitting and (ii) a Title V Operating permit is required. Third, the EPA issued a final rule to implement the MinorNew Source Review Program in Indian Country for oil and natural gas production designed to limit emissions of harmful air pollution while making thepreconstruction permitting process more streamlined and efficient. These regulations will cause additional costs to reduce emissions of GHGs associated with ouroperations and could hurt demand for the crude oil we gather, transport, store or otherwise handle in connection with our services. Although the EPA announced inApril 2017 it will reconsider the GHG oil and gas emissions rule and delay its compliance, lawsuits have prevented such an effort.Hydraulic Fracturing. Our oil and natural gas segment routinely applies hydraulic fracturing techniques to many of our oil and natural gas properties,including our unconventional resource plays in the Granite Wash of Texas and Oklahoma, the20Table of ContentsMarmaton of Oklahoma, the Wilcox of Texas, and the Mississippian of Kansas. On July 25, 2017, the Bureau of Land Management announced a proposal torescind the 2015 Department of Interior final rule on hydraulic fracturing, a rule that was never in effect due to pending litigation. Multiple bills have beenintroduced in Congress that would (i) block federal regulation of hydraulic fracturing in favor of state rules, (ii) allow a state to regulate hydraulic fracturing onfederal lands within that state, (iii) prevent federal regulation of hydraulic regulation to apply to any land held in trust or restricted status for the benefit of Indianswithout their express consent, (iv) repeal the exemption for hydraulic fracturing in the Safe Drinking Water Act, and/or (v) require the disclosure of chemicals usedin hydraulic fracturing. In addition, certain states in which we operate, including Texas, Oklahoma, Kansas, Colorado, and Wyoming have adopted, and other statesand municipalities and other local governmental entities in some states, have and others are considering adopting regulations and ordinances that could imposemore stringent permitting, public disclosure of fracking fluids, waste disposal, and well construction requirements on these operations, and even restrict or banhydraulic fracturing in certain circumstances.On December 31, 2016, the EPA released its scientific Final Report on Impacts from Hydraulic Fracturing Activities on Drinking Water. The EPA states thereport, which was done at the request of Congress, provides scientific evidence that hydraulic fracturing activities can affect drinking water resources in the UnitedStates under some circumstances. The EPA identifies six conditions under which impacts from hydraulic fracturing activities can be more frequent or severe andexisting uncertainties and data gaps. Both the EPA and the United States Geological Survey (USGS) have made statements indicating that activities associated withhydraulic fracturing may be causing earthquakes, with the focus being on wastewater disposal wells rather than injection wells. In an August 2015 report sent tothe Texas Railroad Commission, the EPA stated it believes there is a significant possibility that North Texas earthquake activity is associated with disposal wells.The USGS has stated that hydraulic fracturing causes small earthquakes, but they are almost always too small to be detected. Regarding disposal wells, the USGShas stated that the injection of wastewater and salt water by deep wells into the subsurface can cause earthquakes that are large enough to be felt and may causedamage. As a result, the USGS and its university partners have deployed seismometers at sites of known or possible injection induced earthquakes in Arkansas,Colorado, Kansas, Oklahoma, Ohio and Texas and that it is also developing methods to assess the earthquake hazard associated with wastewater injection wells.Any new laws, regulation, or permitting requirements regarding hydraulic fracturing could lead to operational delay, or increased operating costs or thirdparty or governmental claims, and could result in additional burdens that could delay or limit the drilling services we provide to third parties whose drillingoperations could be affected by these regulations or increase our costs of compliance and doing business and delay the development of unconventional gasresources from shale formations which are not commercial without using hydraulic fracturing. Restrictions on hydraulic fracturing could also reduce the oil andnatural gas we can ultimately produce from our reserves.Other; Compliance Costs. We cannot predict future legislation or regulations. It is possible that some future laws, regulations, and/or ordinances could causeincreasing our compliance costs or additional operating restrictions and those of our customers. Such future developments also might curtail the demand for fossilfuels which could hurt the demand for our services, which could hurt our future results of operations. Likewise we cannot predict with any certainty whether anychanges to temperature, storm intensity or precipitation patterns because of climate change (or otherwise) will have a material impact on our operations.Compliance with applicable environmental requirements has not, to date, had a material effect on the cost of our operations, earnings, or competitiveposition. However, as noted above in our discussion of the regulation of GHGs and hydraulic fracturing, compliance with amended, new or more stringentrequirements of existing environmental regulations or requirements may cause us to incur additional costs or subject us to liabilities that may have a materialadverse effect on our results of operations and financial condition.FINANCIAL INFORMATION ABOUT GEOGRAPHIC AREASHistorically, our revenues from our Canadian operations, and information relating to long-lived assets attributable to those operations were immaterial. Weno longer have any interests there or any other international operations.21Table of ContentsItem 1A. Risk FactorsFORWARD-LOOKING STATEMENTS/CAUTIONARY STATEMENT AND RISK FACTORSThis report contains “forward-looking statements” – meaning, statements related to future events within the meaning of Section 27A of the Securities Act of1933, as amended and Section 21E of the Securities Exchange Act of 1934, as amended. All statements, other than statements of historical facts, included orincorporated by reference in this document which addresses activities, events or developments which we expect or anticipate will or may occur, are forward-looking statements. The words “believes,” “intends,” “expects,” “anticipates,” “projects,” “estimates,” “predicts,” and similar expressions are used to identifyforward-looking statements. This report modifies and supersedes documents filed by us before this report. In addition, certain information we file with the SEC inthe future will automatically update and supersede information in this report.These forward-looking statements include, among others, such things as:•the amount and nature of our future capital expenditures and how we expect to fund our capital expenditures;•prices for oil, NGLs, and natural gas;•demand for oil, NGLs, and natural gas;•our exploration and drilling prospects;•the estimates of our proved oil, NGLs, and natural gas reserves;•oil, NGLs, and natural gas reserve potential;•development and infill drilling potential;•expansion and other development trends of the oil and natural gas industry;•our business strategy;•our plans to maintain or increase production of oil, NGLs, and natural gas;•the number of gathering systems and processing plants we plan to construct or acquire;•volumes and prices for natural gas gathered and processed;•expansion and growth of our business and operations;•demand for our drilling rigs and drilling rig rates;•our belief that the final outcome of our legal proceedings will not materially affect our financial results;•our ability to timely secure third-party services used in completing our wells;•our ability to transport or convey our oil, NGLs, or natural gas production to established pipeline systems;•impact of federal and state legislative and regulatory actions affecting our costs and increasing operating restrictions or delays and other adverseimpacts on our business;•our projected production guidelines for the year;•our anticipated capital budgets;•our financial condition and liquidity;•the number of wells our oil and natural gas segment plans to drill during the year; and•our estimates of the amounts of any ceiling test write-downs or other potential asset impairments we may have to record in future periods.These statements are based on certain assumptions and analyses made by us considering our experience and our perception of historical trends, currentconditions, and expected future developments and other factors we believe are appropriate in the circumstances. Whether actual results and developments willconform to our expectations and predictions is subject to several risks and uncertainties any one or combination of which could cause our actual results to differmaterially from our expectations and predictions, including:•the risk factors discussed in this document and in the documents (if any) we incorporate by reference;22Table of Contents•general economic, market, or business conditions;•the availability of and nature of (or lack of) business opportunities we pursue;•demand for our land drilling services;•changes in laws or regulations;•changes in the current geopolitical situation;•risks relating to financing, including restrictions in our debt agreements and availability and cost of credit;•risks associated with future weather conditions;•decreases or increases in commodity prices; and•other factors, most of which are beyond our control.You should not place undue reliance on these forward-looking statements. Except as required by law, we disclaim any intention to update forward-lookinginformation and to release publicly the results of any future revisions we may make to forward-looking statements to reflect events or circumstances after the dateof this document to reflect unanticipated events.To help provide you with a more thorough understanding of the possible effects of these influences on any forward-looking statements made by us, thisdiscussion outlines some (but not all) of the factors that could cause our consolidated results to differ materially from those that may be presented in any forward-looking statement made by us or on our behalf.Demand for our contract drilling and mid-stream services depends substantially on the levels of expenditures by the oil and gas industry. A substantial oran extended decline in oil and gas prices could cause lower expenditures by the oil and gas industry, which could have a material adverse effect on ourfinancial condition, results of operations and cash flows. Demand for our contract drilling and mid-stream services depends substantially on the level ofexpenditures by the oil and gas industry for the exploration, development and production of oil and natural gas reserves. These expenditures depend generally onthe industry’s view of future oil and natural gas prices and are sensitive to the industry’s view of future economic growth and the resulting impact on demand foroil and natural gas. Declines, and anticipated declines, in oil and gas prices could also result in project modifications, delays or cancellations, general businessdisruptions, and delays in payment of, or nonpayment of, amounts owed to us. These effects could have a material adverse effect on our financial condition, resultsof operations and cash flows.The oil and gas industry has historically experienced periodic downturns, which have been characterized by diminished demand for oilfield services anddownward pressure on the prices we charge. A significant downturn in the oil and gas industry could cause a reduction in demand for oilfield services and couldhurt our financial condition, results of operations and cash flows.Oil, NGLs, and Natural Gas Prices. Besides the impact oil and gas prices may have on our contract drilling and mid-stream segments, the prices we receivefor our oil, NGLs, and natural gas production directly affect our revenues, profitability, and cash flow and our ability to meet our projected financial andoperational goals. The prices for oil, NGLs, and natural gas are determined on several factors beyond our control, including:•the demand for and supply of oil, NGLs, and natural gas;•weather conditions in the continental United States (which can greatly influence the demand and prices for natural gas);•the amount and timing of oil, liquid natural gas, and liquefied petroleum gas imports and exports;•the ability of distribution systems in the United States to effectively meet the demand for oil, NGLs, and natural gas, particularly in times of peakdemand which may result because of adverse weather conditions;•the ability or willingness of the OPEC to set and maintain production levels for oil;•oil and gas production levels by non-OPEC countries;•the level of excess production capacity;•political and economic uncertainty and geopolitical activity;•governmental policies and subsidies;23Table of Contents•the costs of exploring for producing and delivering oil and gas; and•technological advances affecting energy consumption.Oil prices are extremely sensitive to influences domestic and foreign based on political, social or economic underpinnings, any of which could have animmediate and significant effect on the price and supply of oil . In addition, prices of oil, NGLs, and natural gas have been at various times influenced by tradingon the commodities markets. That trading has increased the volatility associated with these prices resulting in large differences in prices even on a week-to-weekand month-to-month basis. These factors, especially when coupled with much of our product prices being determined daily, can, and do, lead to wide fluctuationsin the prices we receive.Based on our 2017 production, a $0.10 per Mcf change in what we receive for our natural gas production, without the effect of derivatives, would cause acorresponding $410,000 per month ( $4.9 million annualized) change in our pre-tax operating cash flow. A $1.00 per barrel change in our oil price, without theeffect of derivatives, would have a $217,000 per month ( $2.6 million annualized) change in our pre-tax operating cash flow and a $1.00 per barrel change in ourNGLs price, without the effect of derivatives, would have a $380,000 per month ( $4.6 million annualized) change in our pre-tax operating cash flow.To reduce our exposure to short-term fluctuations in the price of oil, NGLs, and natural gas, we sometimes enter into derivative contracts such as swaps andcollars. To date, we have derivatives covering part, but not all of our production which provides price protection only against declines in oil, NGLs, and natural gasprices on the production subject to our derivatives, but not otherwise. Should market prices for the production we have derivatives exceed the prices due under ourderivative contracts, our derivative contracts then expose us to risk of financial loss and limit the benefit to us of those increases in market prices. During 2017 , allof our NGLs volumes, half of our oil, and about a quarter of our natural gas volumes were sold at market responsive prices. To help manage our cash flow andcapital expenditure requirements, we had derivative contracts on approximately 50% and 72% of our 2017 average daily production for oil and natural gas,respectively. A more thorough discussion of our derivative arrangements is contained in the Management’s Discussion and Analysis of Financial Condition andResults of Operations section of this report in Item 7.Uncertainty of Oil, NGLs, and Natural Gas Reserves; Ceiling Test. Many uncertainties are inherent in estimating quantities of oil, NGLs, and natural gasreserves and their values, including many factors beyond our control. The oil, NGLs, and natural gas reserve information in this report represents only an estimateof these reserves. Oil, NGLs, and natural gas reservoir engineering is a subjective and an inexact process of estimating underground accumulations of oil, NGLs,and natural gas that cannot be measured in an exact manner. Estimates of economically recoverable oil, NGLs, and natural gas reserves depend on several variablefactors, including historical production from the area compared with production from other producing areas, and assumptions about:•reservoir size;•the effects of regulations by governmental agencies;•future oil, NGLs, and natural gas prices;•future operating costs;•severance and excise taxes;•operational risks;•development costs; and•workover and remedial costs.Some or all of these assumptions may vary considerably from actual results. For these and other reasons, estimates of the economically recoverablequantities of oil, NGLs, and natural gas attributable to any group of properties, classifications of those oil, NGLs, and natural gas reserves based on risk ofrecovery, and estimates of the future net cash flows from oil, NGLs, and natural gas reserves prepared by different engineers or by the same engineers but atdifferent times may vary substantially. Accordingly, oil, NGLs, and natural gas reserve estimates may be subject to periodic downward or upward adjustments.Actual production, revenues, and expenditures regarding our oil, NGLs, and natural gas reserves will likely vary from estimates and those variances may bematerial.24Table of ContentsThe information regarding discounted future net cash flows in this report is not necessarily the current market value of the estimated oil, NGLs, and naturalgas reserves attributable to our properties. Using full cost accounting requires us to use the unweighted arithmetic average of the commodity prices existing on thefirst day of each of the 12 months before the end of the reporting period to calculate discounted future revenues, unless prices were otherwise determined undercontractual arrangements. Actual future prices and costs may be materially higher or lower. Actual future net cash flows are also affected, in part, by these factors:•the amount and timing of oil, NGLs, and natural gas production;•supply and demand for oil, NGLs, and natural gas;•increases or decreases in consumption; and•changes in governmental regulations or taxation.In addition, the 10% discount factor, required by the SEC for calculating discounted future net cash flows for reporting purposes, is not necessarily the mostappropriate discount factor based on interest rates in effect from time to time and the risks associated with our operations or the oil and natural gas industry.We review quarterly the carrying value of our oil and natural gas properties under the full cost accounting rules of the SEC. Under these rules, capitalizedcosts of proved oil and natural gas properties may not exceed the present value of estimated future net revenues from those proved reserves, discounted at 10%.Application of this “ceiling test” generally requires pricing future revenue at the unescalated 12-month average price and requires a write-down for accountingpurposes if we exceed the ceiling. We may be required to write-down the carrying value of our oil and natural gas properties when oil, NGLs, and natural gasprices are depressed. If a write-down is required, it would cause a charge to earnings but would not impact our cash flow from operating activities. Once incurred, awrite-down is not reversible.Debt and Bank Borrowing. We have incurred and expect to continue to incur substantial capital expenditures in our operations. Historically, we have fundedour capital needs through a combination of internally generated cash flow and borrowings under our bank credit agreement. In 2011 and 2012, we issued $250.0million (the 2011 Notes) and $400.0 million (the 2012 Notes), respectively, of senior subordinated notes (collectively, the Notes). We have, and will continue tohave, a certain amount of indebtedness. At December 31, 2017 , we had $178.0 million of outstanding long-term debt under our credit agreement, and $642.3million , net of unamortized discount and debt issuance costs, under the Notes.Depending on our debt, the cash flow needed to satisfy that debt and the covenants in our bank credit agreement and those applicable to the Notes could:•limit funds otherwise available for financing our capital expenditures, our drilling program or other activities or cause us to curtail these activities;•limit our flexibility in planning for or reacting to changes in our business;•place us at a competitive disadvantage to those of our competitors that are less indebted than we are;•make us more vulnerable during periods of low oil, NGLs, and natural gas prices or if a downturn in our business occurs; and•prevent us from obtaining additional financing on acceptable terms or limit amounts available under our existing or any future credit facilities.Our ability to meet our debt obligations depends on our future performance. If the requirements of our indebtedness are not satisfied, a default could bedeemed to occur and our lenders or the holders of the Notes could accelerate the payment of the outstanding indebtedness. If that were to happen, we would nothave sufficient funds available (and probably could not obtain the financing required) to meet our obligations.Our existing debt, and our future debt, if any, is, largely, based on the costs associated with the projects we undertake and of our cash flow. Generally, ournormal operating costs are those resulting from the drilling of oil and natural gas wells, the acquisition of producing properties, the costs associated with themaintenance, upgrade, or expansion of our drilling rig fleet, and the operations of our natural gas buying, selling, gathering, processing, and treating systems. Tosome extent, these costs, particularly the first two, are discretionary and we maintain some control regarding the timing or the need to incur them. But, sometimes,unforeseen circumstances may arise, like an unanticipated opportunity to make a large acquisition or the need to25Table of Contentsreplace a costly drilling rig component due to an unexpected loss, which could force us to incur additional debt above what we had expected or forecasted.Likewise, if our cash flow should prove insufficient to cover our cash requirements we would need to increase our debt either through bank borrowings orotherwise.RISK FACTORSMany other factors could hurt our business. This discussion describes the material risks currently known to us. However, additional risks we do not knowabout or that we currently view as immaterial may also impair our business or hurt the value of our securities. You should carefully consider the risks describedbelow together with the other information contained in, or incorporated by reference into, this report.If demand for oil, NGLs, and natural gas is reduced, our ability to market and produce our oil, NGLs, and natural gas may be negatively affected.Historically, oil, NGLs, and natural gas prices have been volatile, with significant increases and significant price drops being experienced occasionally.Various factors beyond our control will have a significant effect on oil, NGLs, and natural gas prices. Those factors include, among other things, the domestic andforeign supply of oil, NGLs, and natural gas, the price of imports, the levels of consumer demand, the price and availability of alternative fuels, the availability ofpipeline capacity, and changes in existing and proposed federal regulation and price controls.The oil, NGLs, and natural gas markets are also unsettled due to several factors. Production from oil and natural gas wells in some geographic areas of theUnited States has been curtailed for considerable periods of time due to a lack of market demand and transportation and storage capacity. It is possible, however,that some of our wells may be shut-in or that oil, NGLs, and natural gas will be sold on terms less favorable than might otherwise be obtained should demand foroil, NGLs, and natural gas decrease. Competition for markets has been vigorous and there remains great uncertainty about prices that purchasers will pay. Oil,NGLs, and natural gas surpluses could cause our inability to market oil, NGLs, and natural gas profitably, causing us to curtail production and/or receive lowerprices for our oil, NGLs, and natural gas, situations which would hurt us.Disruptions in the financial markets could affect our ability to obtain financing or refinance existing indebtedness on reasonable terms and may have otheradverse effects.Commercial-credit and equity market disruptions may cause tight capital markets in the United States. Liquidity in the global-capital markets can be severelycontracted by market disruptions making terms for certain financings less attractive, and in certain cases, result in the unavailability of certain types of financing.Because credit and equity market turmoil, we may not be able to obtain debt or equity financing, or refinance existing indebtedness on favorable terms, whichcould affect operations and financial performance.Oil, NGLs, and natural gas prices are volatile, and low prices have negatively affected our financial results and could do so in the future.Our revenues, operating results, cash flow, and growth depend substantially on prevailing prices for oil, NGLs, and natural gas. Historically, oil, NGLs, andnatural gas prices and markets have been volatile, and they are likely to continue to be volatile. Any decline in prices would have a negative impact on our futurefinancial results and our ability to grow our business segments.Prices for oil, NGLs, and natural gas are subject to wide fluctuations in response to relatively minor changes in the actual or perceived supply of and demandfor oil, NGLs, and natural gas, market uncertainty, and many additional factors that are beyond our control. These factors include:•political conditions in oil producing regions;•the ability of the members of the OPEC to agree on prices and their ability or willingness to maintain production quotas;•actions taken by foreign oil and natural gas companies;•the price of foreign oil imports;•imports and exports of oil and liquefied natural gas;26Table of Contents•actions of governmental authorities;•the domestic and foreign supply of oil, NGLs, and natural gas;•the level of consumer demand;•United States storage levels of oil, NGLs, and natural gas;•weather conditions;•domestic and foreign government regulations;•the price, availability, and acceptance of alternative fuels;•volatility in ethane prices causing rejection of ethane as part of the liquids processed stream; and•worldwide economic conditions.These factors and the volatile nature of the energy markets make it impossible to predict with any certainty the future prices of oil, NGLs, and natural gas.Our contract drilling operations depend on levels of activity in the oil, NGLs, and natural gas exploration and production industry.Our contract drilling operations depend on the level of activity in oil, NGLs, and natural gas exploration and production in our operating markets. Both short-term and long-term trends in oil, NGLs, and natural gas prices affect the level of that activity. Because oil, NGLs, and natural gas prices are volatile, the level ofexploration and production activity can also be volatile. Any decrease from current oil, NGLs, and natural gas prices could further depress the level of explorationand production activity. This, in turn, would likely result in further declines in the demand for our drilling services and would have an adverse effect on ourcontract drilling revenues, cash flows, and profitability. As a result, the future demand for our drilling services is uncertain.The industries in which we operate are highly competitive, and many of our competitors have resources greater than we do.The drilling industry in which we operate is generally very competitive. Most drilling contracts are awarded based on competitive bids, which may causeintense price competition. Some of our competitors in the contract drilling industry have greater financial and human resources than we do. These resources mayenable them to better withstand periods of low drilling rig utilization, to compete more effectively based on price and technology, to build new drilling rigs oracquire existing drilling rigs, and to provide drilling rigs more quickly than we do in periods of high drilling rig utilization.The oil and natural gas industry is also highly competitive. We compete in the areas of property acquisitions and oil and natural gas exploration,development, production, and marketing with major oil companies, other independent oil and natural gas concerns, and individual producers and operators. Inaddition, we must compete with major and independent oil and natural gas concerns in recruiting and retaining qualified employees. Many of our competitors inthe oil and natural gas industry have resources substantially greater than we do.The mid-stream industry is also highly competitive. We compete in areas of gathering, processing, transporting, and treating natural gas with other mid-stream companies. We are continually competing with larger mid-stream companies for acquisitions and construction projects. Many of our competitors havegreater financial resources, human resources, and geographic presence larger than we do.Growth through acquisitions is not assured.We have experienced growth in each segment, in part, through mergers and acquisitions. The contract land drilling industry, the exploration anddevelopment industry, and the gas gathering and processing industry, have experienced significant consolidation over the past several years, and there can be noassurance that acquisition opportunities will be available. Even if available, there is no assurance we would have the financial ability to pursue the opportunity.And we are likely to continue to face intense competition from other companies for acquisition opportunities.27Table of ContentsThere can be no assurance we will:•be able to identify suitable acquisition opportunities;•have sufficient capital resources to complete additional acquisitions;•successfully integrate acquired operations and assets;•effectively manage the growth and increased size;•maintain the crews and market share to operate any future drilling rigs we may acquire; or•improve our financial condition, results of operations, business or prospects in any material manner because of any completed acquisition.We may incur substantial indebtedness to finance future acquisitions and also may issue debt instruments, equity securities, or convertible securities inconnection with any acquisitions. Debt service requirements could represent a significant burden on our results of operations and financial condition and issuingadditional equity would be dilutive to existing shareholders. Also, continued growth could strain our management, operations, employees, and other resources.Successful acquisitions, particularly those of oil and natural gas companies or of oil and natural gas properties, require an assessment of several factors,many of which are beyond our control. These factors include recoverable reserves, exploration potential, future oil, NGLs, and natural gas prices, operating costs,and potential environmental and other liabilities. Such assessments are inexact and their accuracy is inherently uncertain.Our operations have significant capital requirements, and our indebtedness could have important consequences.We have experienced and will continue to experience substantial capital needs for our operations. We have $642.3 million of indebtedness outstanding (netof unamortized discount and debt issuance costs) under the senior subordinated notes we have issued to date and, in addition, may borrow up to $475.0 millionunder our credit agreement. As of February 13, 2018 , we had $173.8 million outstanding borrowings under our credit agreement. Our level of indebtedness, thecash flow to satisfy our indebtedness, and the covenants governing our indebtedness could:•limit funds available for financing capital expenditures, our drilling program or other activities or cause us to curtail these activities;•limit our flexibility in planning for, or reacting to changes in, our business;•place us at a competitive disadvantage to some of our competitors that are less leveraged than we are;•make us more vulnerable during periods of low oil, NGLs, and natural gas prices or if downturn in our business occurs; and•prevent us from obtaining additional financing on acceptable terms or limit amounts available under our existing or any future credit facilities.Our ability to meet our debt service and other contractual and contingent obligations will depend on our future performance. In addition, lower oil, NGLs,and natural gas prices could cause future reductions in the amount available for borrowing under our credit agreement, reducing our liquidity, and even triggeringmandatory loan repayments.The instruments governing our indebtedness contain various covenants limiting the conduct of our business.The indentures governing our senior subordinated notes and our credit agreement contain various restrictive covenants that limit the conduct of our business.These agreements place certain limits on our ability to, among other things:•incur additional indebtedness, guarantee obligations or issue disqualified capital stock;•pay dividends or distributions on our capital stock or redeem, repurchase or retire our capital stock;•make investments or other restricted payments;•grant liens on assets;•enter into transactions with stockholders or affiliates;28Table of Contents•sell assets;•issue or sell capital stock of certain subsidiaries; and•merge or consolidate.In addition, our credit agreement also requires us to maintain a minimum current ratio and a maximum senior indebtedness or leverage ratio.If we violate the restrictions in the indentures governing our senior subordinated notes, our credit agreement or any other subsequent financing agreements, adefault may allow the creditors, if the agreements so provide, to accelerate the related indebtedness and any other indebtedness to which a cross-acceleration orcross-default provision applies. If that occurs, we may not make the required payments or borrow sufficient funds to refinance that debt. Even if new financingwere available at that time, it may not be on terms acceptable to us. In addition, lenders may be able to terminate any commitments they had made to makeavailable further funds.Our future performance depends on our ability to find or acquire additional oil, NGLs, and natural gas reserves that are economically recoverable.Production from oil and natural gas properties declines as reserves are depleted, with the rate of decline depending on reservoir characteristics. Unless wereplace the reserves we produce, our reserves will decline, resulting eventually in a decrease in oil, NGLs, and natural gas production and lower revenues and cashflow from operations. Historically, we have increased reserves after taking production into account through exploration and development. We have conductedthese activities on our existing oil and natural gas properties and on newly acquired properties. We may not continue to replace reserves from these activities atacceptable costs. Lower prices of oil, NGLs, and natural gas may further limit the reserves that can economically be developed. Lower prices also decrease ourcash flow and may cause us to decrease capital expenditures.We are continually identifying and evaluating opportunities to acquire oil and natural gas properties, including acquisitions significantly larger than thoseconsummated by us. We cannot assure you we will successfully consummate any acquisition, that we can acquire producing oil and natural gas properties thatcontain economically recoverable reserves or that any acquisition will be profitably integrated into our operations.The competition for producing oil and natural gas properties is intense. This competition could mean that to acquire properties we must pay higher prices andaccept greater ownership risks than we have in the past.Our exploration and production and mid-stream operations involve high business and financial risk which could hurt us.Exploration and development involve numerous risks that may cause dry holes, the failure to produce oil, NGLs, and natural gas in commercial quantitiesand the inability to fully produce discovered reserves. The cost of drilling, completing, and operating wells is substantial and uncertain. Numerous factors beyondour control may cause the curtailment, delay, or cancellation of drilling operations, including:•unexpected drilling conditions;•pressure or irregularities in formations;•capacity of pipeline systems;•equipment failures or accidents;•adverse weather conditions;•compliance with governmental requirements; and•shortages or delays in the availability of drilling rigs, pressure pumping services, or delivery crews and the delivery of equipment.Exploratory drilling is a speculative activity. Although we may disclose our overall drilling success rate, those rates may decline. Although we may discussdrilling prospects we have identified or budgeted for, we may ultimately not lease or drill these prospects within the expected time frame, or at all. Lack of drillingsuccess will have an adverse effect on our future results of operations and financial condition.29Table of ContentsOur mid-stream operations involve numerous risks, both financial and operational. The cost of developing gathering systems and processing plants issubstantial and our ability to recoup these costs is uncertain. Our operations may be curtailed, delayed, or canceled because of many things beyond our control,including:•unexpected changes in the deliverability of natural gas reserves from the wells connected to the gathering systems;•availability of competing pipelines in the area;•capacity of pipeline systems;•equipment failures or accidents;•adverse weather conditions;•compliance with governmental requirements;•delays in developing other producing properties within the gathering system’s area of operation; and•demand for natural gas and its constituents.Many of the wells from which we gather and process natural gas are operated by other parties. We have little control over the operations of those wellswhich can act to increase our risk. Operators of those wells may act in ways not in our best interests.Competition for experienced technical personnel may negatively affect our operations or financial results.The success of our three segments and the success of our other activities integral to our operations will depend, in part, on our ability to attract and retainexperienced geologists, engineers, and other professionals. Competition for these professionals can be intense, particularly when the industry is experiencingfavorable conditions.Our derivative arrangements might limit the benefit of increases in oil, NGLs, and natural gas prices.To reduce our exposure to short-term fluctuations in the price of oil, NGLs, and natural gas, we sometimes enter into derivative contracts. These derivativecontracts apply to only a portion of our production and provide only partial price protection against declines in oil, NGLs, and natural gas prices. These derivativecontracts may expose us to risk of financial loss and limit the benefit to us of increases in prices.Estimates of our reserves are uncertain and may prove inaccurate.Numerous uncertainties are inherent in estimating quantities of proved reserves and their values, including many factors beyond our control. The reserve datarepresents only estimates. Reservoir engineering is a subjective and inexact process of estimating underground accumulations of oil and natural gas that cannot bemeasured in an exact manner. Estimates of economically recoverable oil, NGLs, and natural gas reserves depend on several variable factors, including historicalproduction from the area compared with production from other producing areas, and assumptions about:•the effects of regulations by governmental agencies;•future oil, NGLs, and natural gas prices;•future operating costs;•severance and excise taxes;•development costs; and•workover and remedial costs.Some or all of these assumptions may vary considerably from actual results. Estimates of the economically recoverable quantities of oil, NGLs, and naturalgas attributable to any group of properties, classifications of those reserves based on risk of recovery, and estimates of the future net cash flows from reservesprepared by different engineers or by the same engineers but at different times may vary substantially. Accordingly, reserve estimates may be subject to downwardor upward adjustment. Actual production, revenues and expenditures regarding our reserves will likely vary from estimates, and those variances may be material.30Table of ContentsThe information regarding discounted future net cash flows should not be considered as the current market value of the estimated oil, NGLs, and natural gasreserves attributable to our properties. As required by the SEC, the estimated discounted future net cash flows from proved reserves are based on prices on the firstday of the month for each month within the 12-month period before the end of the reporting period and costs as of the date of the estimate, while actual futureprices and costs may be materially higher or lower. Actual future net cash flows also will be affected by these factors:•the amount and timing of actual production;•supply and demand for oil, NGLs, and natural gas;•increases or decreases in consumption; and•changes in governmental regulations or taxation.In addition, the 10% per year discount factor, which is required by the SEC to be used in calculating discounted future net cash flows for reporting purposes,is not necessarily the most appropriate discount factor based on interest rates in effect from time to time and risks associated with our operations or the oil andnatural gas industry.If oil, NGLs, and natural gas prices decrease or are unusually volatile, we may have to take write-downs of our oil and natural gas properties, the carryingvalue of our drilling rigs or our natural gas gathering and processing systems.We review quarterly the carrying value of our oil and natural gas properties under the full cost accounting rules of the SEC. Under these rules, capitalizedcosts of proved oil and natural gas properties may not exceed the present value of estimated future net revenues from proved reserves, discounted at 10% per year.Application of the ceiling test generally requires pricing future revenue at the unweighted arithmetic average of the price on the first day of month for each monthwithin the 12-month period before the end of the reporting period, unless prices were defined by contractual arrangements, and requires a write-down foraccounting purposes if the ceiling is exceeded. We may be required to write-down the carrying value of our oil and natural gas properties when oil, NGLs, andnatural gas prices are depressed. If a write-down is required, it would cause a charge to earnings, but would not impact cash flow from operating activities. Onceincurred, a write-down of oil and natural gas properties is not reversible later. Because our ceiling tests use a rolling 12-month look back average price it is possiblethat a write down during a reporting period will not remove the need for us to take additional write downs in one or more succeeding periods. This would be thecase when months with higher commodity prices roll off the 12-month period and are replaced with more recent months having lower commodity prices.Our drilling equipment, transportation equipment, gas gathering and processing systems, and other property and equipment are carried at cost. We arerequired to periodically test to see if these values, including associated goodwill and other intangible assets, have been impaired whenever events or changes incircumstances suggest the carrying amount may not be recoverable. If any of these assets are determined to be impaired, the loss is measured as the amount bywhich the carrying amount of the asset exceeds its fair value. An estimate of fair value is based on the best information available, including prices for similarassets. Changes in these estimates could cause us to reduce the carrying value of property, equipment, and related intangible assets. Once these values have beenreduced, they are not reversible.Our operations present inherent risks of loss that, if not insured or indemnified against, could hurt our results of operations.Our contract drilling operations are subject to many hazards inherent in the drilling industry, including blowouts, cratering, explosions, fires, loss of wellcontrol, loss of hole, damaged or lost drilling equipment, and damage or loss from inclement weather. Our exploration and production and mid-stream operationsare subject to these and similar risks. These events could cause personal injury or death, damage to or destruction of equipment and facilities, suspension ofoperations, environmental damage, and damage to the property of others. Generally, drilling contracts provide for the division of responsibilities between a drillingcompany and its customer, and we seek to obtain indemnification from our drilling customers by contract for some of these risks. If we cannot transfer these risksto drilling customers by contract or indemnification agreements (or to the extent we assume obligations of indemnity or assume liability for certain risks under ourdrilling contracts), we seek protection from some of these risks through insurance. However, some risks are not covered by insurance and we cannot assure youthat the insurance we have or the indemnification agreements we have will adequately protect us against liability from the consequences of the hazards describedabove. An event not fully insured or indemnified against, or the failure of a customer to meet its indemnification obligations, could cause substantial losses. Inaddition, we cannot assure you that insurance will be available to cover any or all of these risks. Even if available, the insurance might not be adequate to cover allof our losses, or we might decide against obtaining that insurance because of high premiums or other costs.31Table of ContentsWe do not operate many of the wells in which we own an interest. Our operating risks for those wells and our ability to influence the operations for thosewells are less subject to our control. Operators of those wells may act in ways not in our best interests.Governmental and environmental regulations could hurt our business.Our business is subject to federal, state, and local laws and regulations on taxation, the exploration for and development, production, and marketing of oiland natural gas, and safety matters. Many laws and regulations require drilling permits and govern the spacing of wells, rates of production, prevention of waste,unitization and pooling of properties, and other matters. These laws and regulations have increased the costs of planning, designing, drilling, installing, operating,and abandoning our oil and natural gas wells and other facilities. In addition, these laws and regulations, and any others that are passed by the jurisdictions wherewe have production, could limit the number of wells drilled or the allowable production from successful wells, which could limit our revenues.We are (or could become) subject to complex environmental laws and regulations adopted by the jurisdictions where we own or operate. We could incurliability to governments or third parties for discharges of oil, natural gas or other pollutants into the air, soil or water, including responsibility for remedial costs.We could discharge these materials into the environment in many ways including:•from a well or drilling equipment at a drill site;•from gathering systems, pipelines, transportation facilities, and storage tanks;•damage to oil and natural gas wells resulting from accidents during normal operations;•sabotage; and•blowouts, cratering, and explosions.Because the requirements imposed by laws and regulations frequently change, we cannot assure you that future laws and regulations, including changes toexisting laws and regulations, will not hurt our business. The Congress and White House administration may impose or change laws and regulations that will hurtour business. Stricter standards, greater regulation, and more extensive permit requirements, could increase our future risks and costs related to environmentalmatters. In addition, because we acquire interests in properties operated in the past by others, we may be liable for environmental damage caused by the formeroperators, which liability could be material.Any future implementation of price controls on oil, NGLs, and natural gas would affect our operations.Certain groups have asserted efforts to have the United States Congress impose price controls on either oil, natural gas, or both. There is no way at this timeto know what result these efforts will have nor, if implemented, their effect on our operations. However, it is possible that these efforts, if successful, would limitthe amount we might get for our future oil, NGLs, and natural gas production. Any future limits on the price of oil, NGLs, and natural gas could also cause hurtingthe demand for our drilling services.Provisions of Delaware law and our by-laws and charter could discourage change in control transactions and prevent shareholders from receiving a premiumon their investment.Our by-laws and charter provide for a classified board of directors with staggered terms and authorizes the board of directors to set the terms of preferredstock. In addition, our charter and Delaware law contain provisions that impose restrictions on business combinations with interested parties. Because of our by-laws, charter, and Delaware law, persons considering unsolicited tender offers or other unilateral takeover proposals may be more likely to negotiate with our boardof directors rather than pursue non-negotiated takeover attempts. These provisions may make it more difficult for our shareholders to benefit from transactionsopposed by an incumbent board of directors.32Table of ContentsNew technologies may cause our exploration and drilling methods to become obsolete, resulting in an adverse effect on our production.Our industry is subject to rapid and significant advancements in technology, including the introduction of new products and services using new technologies.As competitors use or develop new technologies, we may be placed at a competitive disadvantage, and competitive pressures may force us to implement newtechnologies at a substantial cost. In addition, competitors may have greater financial, technical, and personnel resources that allow them to enjoy technologicaladvantages and may allow them to implement new technologies before we can. We cannot be certain that we can implement technologies timely or at a costacceptable to us. One or more technologies that we use or that we may implement may become obsolete or may not work as we expected and we may be hurt.We may be affected by climate change and market or regulatory responses to climate change.Climate change, including the impact of potential global warming regulations, could have a material adverse effect on our results of operations, financialcondition, and liquidity. Restrictions, caps, taxes, or other controls on emissions of greenhouse gasses, including diesel exhaust, could significantly increase ouroperating costs. Restrictions on emissions could also affect our customers that (a) use commodities we carry to produce energy, (b) use significant energy inproducing or delivering the commodities we carry, or (c) manufacture or produce goods that consume significant energy or burn fossil fuels, including chemicalproducers, farmers and food producers, and automakers and other manufacturers. Significant cost increases, government regulation, or changes of consumerpreferences for goods or services relating to alternative sources of energy or emissions reductions could materially affect the markets for the commoditiesassociated with our business, which could have a material adverse effect on our results of operations, financial condition, and liquidity. Government incentivesencouraging the use of alternative sources of energy could also affect certain of our customers and the markets for certain of the commodities associated with ourbusiness in an unpredictable manner that could alter our business activities. Finally, we could face increased costs related to defending and resolving legal claimsand other litigation related to climate change and the alleged impact of our operations on climate change. These factors, individually or in operation with one ormore of the other factors, or other unforeseen impacts of climate change could reduce the business activity we conduct and have a material adverse effect on ourresults of operations, financial condition, and liquidity.The results of our operations depend on our ability to transport oil, NGLs, and gas production to key markets.The marketability of our oil, NGLs, and natural gas production depends in part on the availability, proximity, and capacity of pipeline systems, refineries,and other transportation sources. The unavailability of or lack of capacity on these systems and facilities could cause the shut-in of producing wells or the delay ordiscontinuance of development plans for properties. Federal and state regulation of oil, NGLs, and natural gas production and transportation, tax and energypolicies, changes in supply and demand, pipeline pressures, damage to or destruction of pipelines, and general economic conditions could hurt our ability toproduce, gather and, transport oil, NGLs, and natural gas.Losing one or several of our larger customers could have a material adverse effect on our financial condition and results of operations.During 2017 , sales to Sunoco Logistics accounted for 10% of our oil and natural gas revenues. QEP Resources, Inc. was our largest drilling customeraccounting for approximately 26% of our total contract drilling revenues. And for our mid-stream segment, ONEOK, Inc. accounted for approximately 36% of ourrevenues. No other third party customer accounted for 10% or more of any of our individual segment revenues. Any of our customers may choose not to use ourservices and losing several our larger customers could have a material adverse effect on our financial condition and results of operations if we could not findreplacements.Shortage of completion equipment and services could delay or otherwise hurt our oil and natural gas segment's operations.As there is an increase in horizontal drilling activity in certain areas, shortages could cause the availability of third party equipment and services required forcompleting wells drilled by our oil and natural gas segment. We could experience delays in completing some of our wells. Although we can try to reduce thedelays associated with these services, we anticipate these services will be in high demand for the immediate future and could delay, restrict, or curtail part of ourexploration and development operations, which could in turn harm our results.33Table of ContentsOur mid-stream segment depends on certain natural gas producers and pipeline operators for a significant portion of its supply of natural gas and NGLs.Losing any of these producers could cause a decline in our volumes and revenues.We rely on certain natural gas producers for a significant portion of our natural gas and NGLs supply. While some of these producers are subject to long-term contracts, we may not negotiate extensions or replacements of these contracts on favorable terms, if at all. Losing all or even a portion of the natural gasvolumes supplied by these producers, because of competition or otherwise, could have a material adverse effect on our mid-stream segment unless we acquiredcomparable volumes from other sources.The counterparties to our commodity derivative contracts may not perform their obligations to us, which could materially affect our cash flows and results ofoperations.To reduce our exposure to adverse fluctuations in the prices of oil and natural gas, we currently, and may in the future, enter into commodity derivativecontracts for a significant portion of our forecasted oil, NGLs, and natural gas production. The extent of our commodity price exposure is related largely to theeffectiveness and scope of our derivative activities, and to the ability of counterparties under our commodity derivative contracts to satisfy their obligations to us. Ifone or more of our counterparties is unable or unwilling to pay us under our commodity derivative contracts, it could have a material adverse effect on ourfinancial condition and results of operations.Reliance on management.We depend greatly on the efforts of our executive officers and other key employees to manage our operations. The loss or unavailability of any of ourexecutive officers or other key employees could have a material adverse effect on our business.We are subject to various claims and litigation that could ultimately be resolved against us requiring material future cash payments and/or future materialcharges against our operating income and materially impairing our financial position.The nature of our business makes us highly susceptible to claims and litigation. We are subject to various existing legal claims and lawsuits, which couldhave a material adverse effect on our consolidated financial position, results of operations, or cash flows. Any claims or litigation, even if fully indemnified orinsured, could negatively affect our reputation among our customers and the public, and make it more difficult for us to compete effectively or obtain adequateinsurance in the future.Derivative regulations in current financial reform legislation could impede our ability to manage business and financial risks by restricting our use ofderivative instruments as hedges against fluctuating commodity prices and interest rates.In July 2010, the Dodd-Frank Wall Street Reform and Consumer Protection Act (the Act) was passed by Congress and signed into law. The Act containssignificant derivative regulations, requiring that certain transactions be cleared on exchanges and a requirement to post cash collateral (commonly called margin)for such transactions. The Act provides for a potential exception from these clearing and cash collateral requirements for commercial end-users and it includesseveral defined terms used in determining how this exception applies to particular derivative transactions and the parties to those transactions. We use crude oil and natural gas derivative instruments regarding a portion of our expected production to reduce commodity price uncertainty and enhancethe predictability of cash flows relating the marketing our crude oil and natural gas. As commodity prices increase, our derivative liability positions increase;however, none of our current derivative contracts require posting margin or similar cash collateral when there are changes in the underlying commodity pricesreferred to in these contracts.Depending on the rules and definitions adopted by the CFTC, we could have to post collateral with our dealer counterparties for our commodities derivativetransactions. Such a requirement could have a significant impact on our business by reducing our ability to execute derivative transactions to reduce commodityprice uncertainty and to protect cash flows. Requirements to post collateral would cause significant liquidity issues by reducing our ability to use cash forinvestment or other corporate purposes, or would require us to increase our level of debt. In addition, a requirement for our counterparties to post collateral wouldlikely cause additional costs being passed on to us, thereby decreasing the effectiveness of our derivative contracts and our profitability.34Table of ContentsProposed federal and state legislative and regulatory initiatives relating to hydraulic fracturing could cause increased costs and additional operatingrestrictions or delays.Hydraulic-fracturing is an essential and common practice in the oil and gas industry used to stimulate production of oil, natural gas, and associated liquidsfrom dense subsurface rock formations. Our oil and natural gas segment routinely apply hydraulic-fracturing techniques to many of our oil and natural gasproperties, including our unconventional resource plays in the Granite Wash of Texas and Oklahoma, the Marmaton and Hoxbar of Oklahoma, the Wilcox ofTexas, and the Mississippian of Kansas. Hydraulic-fracturing involves using water, sand, and certain chemicals to fracture the hydrocarbon-bearing rock formationto allow the flow of hydrocarbons into the wellbore. The process is typically regulated by state oil and natural gas commissions; however, the EPA has assertedfederal regulatory authority over certain hydraulic-fracturing activities involving diesel under the Safe Drinking Water Act and published permitting guidanceaddressing the performance of such activities using diesel. The EPA is also seeking to require companies to disclose information regarding the chemicals used inhydraulic fracturing and the bureau of Land Management has imposed requirements for hydraulic fracturing activities of federal lands. In addition, Congress hasoccasionally considered legislation to provide for federal regulation of hydraulic-fracturing and to require disclosure of the chemicals used in the hydraulic-fracturing process.Certain states in which we operate, including Texas, Oklahoma, Kansas, Colorado, and Wyoming, have adopted, and other states are considering adopting,regulations that could impose more stringent permitting, public disclosure of fracking fluids, waste disposal, and well construction requirements on hydraulic-fracturing operations or otherwise seek to ban fracturing activities altogether. For example, Texas adopted a law in June 2011 requiring disclosure to the RailroadCommission of Texas (RCT) and the public of certain information regarding the components used in the hydraulic-fracturing process. Besides state laws, local landuse restrictions, such as city ordinances, may restrict or prohibit the performance of well drilling and/or hydraulic fracturing. If state, local, or municipal legalrestrictions are adopted in areas where we are conducting, or plan to conduct operations, we may incur additional costs to comply with such requirements that maybe significant, experience delays or curtailment pursuing exploration, development, or production activities, and perhaps even be precluded from the drilling and/orcompletion of wells.There are certain governmental reviews either underway or being proposed that focus on environmental aspects of hydraulic-fracturing practices. The WhiteHouse Council on Environmental Quality is coordinating a review of hydraulic-fracturing practices, and a committee of the United States House of Representativesinvestigated hydraulic-fracturing practices. Furthermore, several federal agencies are analyzing, or have been requested to review, many environmental issuesassociated with hydraulic fracturing. The EPA is evaluating the potential environmental effects of hydraulic fracturing on drinking water and groundwater. Inaddition, the U.S. Department of Energy has investigated practices the agency could recommend to better protect the environment from drilling using hydraulic-fracturing completion methods.And certain members of the Congress have called on the U.S. Government Accountability Office to investigate how hydraulic fracturing might hurt waterresources, the U.S. Securities and Exchange Commission to investigate the natural gas industry and any possible misleading of investors or the public regarding theeconomic feasibility of pursuing natural gas deposits in shales by means of hydraulic fracturing, and the U.S. Energy Information Administration to provide abetter understanding of that agency’s estimates regarding natural gas reserves, including reserves from shale formations, and uncertainties associated with thoseestimates. These ongoing or proposed studies, depending on their course and results obtained, could spur initiatives to further regulate hydraulic fracturing underthe Safe Drinking Water Act or other regulatory processes.Increased regulation and attention given to the hydraulic fracturing process could lead to greater opposition, including litigation, to oil and gas productionactivities using hydraulic fracturing techniques. Additional legislation or regulation could also lead to operational delays or increased operating costs in theproduction of oil, natural gas, and associated liquids including from developing shale plays, or could make it more difficult to perform hydraulic fracturing. Theadoption of additional federal, state or local laws or implementing regulations regarding hydraulic fracturing could cause a decrease in completing of new oil andgas wells, increased compliance costs and time, which could hurt our financial position, results of operations, and cash flows.Our ability to produce crude oil, natural gas, and associated liquids economically and in commercial quantities could be impaired if we cannot acquireadequate supplies of water for our drilling operations and/or completions or cannot dispose of or recycle the water we use at a reasonable cost and under applicableenvironmental rules.To our knowledge, there have been no citations, suits, or contamination of potable drinking water arising from our fracturing operations. We do not haveinsurance policies in effect intended to provide coverage for losses solely related to35Table of Contentshydraulic fracturing operations; however, our general liability and excess liability insurance policies might cover third-party claims related to hydraulic fracturingoperations and associated legal expenses depending on the specific nature of the claims, the timing of the claims, and the specific terms of such policies.Uncertainty regarding increased seismic activity in Oklahoma and Kansas.We conduct oil and natural gas exploration, development and drilling activities in Oklahoma, Kansas, and elsewhere. In recent years, Oklahoma and Kansashas experienced a significant increase in earthquakes and other seismic activity. Some parties believe there is a correlation between certain oil and gas activitiesand the increased occurrence of earthquakes. The extent of this correlation is the subject of studies by both state and federal agencies the results of which remainuncertain. We cannot state at this time what if any impact this seismic activity may have on us or our industry.The hydraulic fracturing process on which we depend to produce commercial quantities of crude oil, natural gas, and associated NGLs from many reservoirsrequires the use and disposal of significant quantities of water.Our inability to secure sufficient amounts of water, or to dispose of or recycle the water used in our oil and natural gas segment operations, could adverselyaffect our operations. The imposition of new environmental initiatives and regulations could include restrictions on our ability to conduct certain operations such ashydraulic fracturing or disposal of wastes, including, but not limited to, produced water, drilling fluids, and other wastes associated with the exploration,development or production of oil and natural gas.Compliance with environmental regulations and permit requirements governing the withdrawal, storage and, use of surface water or groundwater necessaryfor hydraulic fracturing of wells may increase our operating costs and cause delays, interruptions, or termination of our operations, the extent of which cannot bepredicted, all of which could have an adverse effect on our operations and financial condition.We may decide not to drill some prospects we have identified, and locations we drill may not yield oil, NGLs, and natural gas in commercially viable quantities.Our oil and natural gas segment's prospective drilling locations are in various stages of evaluation, ranging from a prospect ready to drill to a prospect thatwill require additional geological and engineering analysis. Based on many factors, including future oil, NGLs, natural gas prices, the generation of additionalseismic or geological information, and other factors, we may decide not to drill one or more of these prospects. As a result, we may not increase or maintain ourreserves or production, which in turn could have an adverse effect on our business, financial position, and results of operations. In addition, the SEC's reservereporting rules require that, subject to limited exceptions, proved undeveloped reserves may only be booked if they relate to wells scheduled to be drilled withinfive years of booking. At December 31, 2017 , we had 99 proved undeveloped drilling locations. If we do not drill these locations within five years of initialbooking, they may not continue to qualify for classification as proved reserves, and we may have to reclassify such reserves as unproved reserves. Thereclassification of those reserves could also have a negative effect on the borrowing base under our credit facility.The cost of drilling, completing, and operating a well is often uncertain, and cost factors can hurt the economics of a well. Our efforts will be uneconomic ifwe drill dry holes or wells that are productive but do not produce enough oil, NGLs, and natural gas to be commercially viable after drilling, operating, and othercosts.The borrowing base under our credit agreement is determined semi-annually at the discretion of the lenders and is based in a large part on the prices for oil,NGLs, and natural gas.Significant declines in oil, NGLs, and natural gas prices may cause a decrease in our borrowing base. The lenders can unilaterally adjust the borrowing baseand therefore the borrowings permitted to be outstanding under our credit agreement. If outstanding borrowings are over the borrowing base, we must (a) repay theamount in excess of the borrowing base, (b) dedicate additional properties to the borrowing base, or (c) begin monthly principal payments under our creditagreement.Potential listing of species as “endangered” under the federal Endangered Species Act could cause increased costs and new operating restrictions or delays onour operations and that of our customers, which could hurt our operations and financial results.The federal Endangered Species Act, referred to as the “ESA,” and analogous state laws regulate a variety of activities, including oil and gas development,which could have an adverse effect on species listed as threatened or endangered under the36Table of ContentsESA or their habitats. The designation of previously unidentified endangered or threatened species could cause oil and natural gas exploration and productionoperators and service companies to incur additional costs or become subject to operating delays, restrictions or bans in affected areas, which impacts couldadversely reduce the amount of drilling activities in affected areas. All three of our business segments could be subject to the effect of one or more species beinglisted as threatened or endangered within the areas of our operations. Numerous species have been listed or proposed for protected status in areas in which weprovide or could in the future undertake operations. The U.S. Fish and Wildlife Service and the National Marine Fisheries in 2016 issued final revised definitionsrelating to impacts on critical habitats for potentially endangered species allowing exclusion of certain areas so long as they will not result in the extinction of thespecies. In 2017, the Western Governor’s Association issued a Policy Resolution calling on Congress to amend and reauthorize the ESA based upon seven broadgoals to make the act more workable and understandable. In December 2017, the Interior Department announced that it is working on possible changes to the ESAwith the U.S. Fish and Wildlife Service to revise the regulations for listing endangered and threatened species and for designation of critical habitat. The presenceof protected species in areas where we provide contract drilling or mid-stream services or conduct exploration and production operations could impair our ability totimely complete or carry out those services and, consequently, adversely affect our results of operations and financial position.Constructing our new proprietary BOSS drilling rigs is subject to risks, including delays and cost overruns, and may not meet our expectations.We have designed and built several new proprietary 1,500 horsepower AC electric drilling rigs, which we call BOSS drilling rigs. This new design shouldposition us to better meet the demands of our customers. Constructing any future new BOSS drilling rigs is subject to the risks of delays or cost overruns inherentin any large construction project because of numerous possible factors, including:•shortages of equipment, materials or skilled labor;•work stoppages and labor disputes;•unscheduled delays in the delivery of ordered materials and equipment;•unanticipated increases in the cost of equipment, labor and raw materials used in construction of our drilling rigs, particularly steel;•weather interferences;•difficulties in obtaining necessary permits or in meeting permit conditions;•unforeseen design and engineering problems;•failure or delay in obtaining acceptance of the drilling rig from our customer;•failure or delay of third party equipment vendors or service providers; and•lack of demand from the downturn in the oil and gas industry.On our new BOSS drilling rigs, there can be no assurance we will:•obtain additional new-build contract opportunities; or•improve our financial condition, results of operations or prospects because of the new drilling rigs.While we hold certain patents regarding our BOSS drilling rig design, it is still possible that third parties may claim we infringe their intellectual propertyrights. We may receive notices from others claiming that our BOSS drilling rig design infringes on their intellectual property rights. In that event we may resolvethese claims by signing royalty and licensing agreements, redesigning the drilling rig, or paying damages. These outcomes may cause operating margins to decline.Besides money damages, in some jurisdictions plaintiffs can seek injunctive relief that may limit or prevent marketing and use of our drilling rigs that haveinfringing technologies.Terrorist attacks or cyber-attacks could have a material adverse effect on our business, financial condition or results of operations.Terrorist attacks or cyber-attacks may significantly affect the energy industry, and economic conditions, including our operations and our customers, as wellas general economic conditions, consumer confidence and spending and market liquidity. Strategic targets, such as energy-related assets, may be at greater risk offuture attacks than other targets in the United States. A37Table of Contentscyber incident could result in information theft, data corruption, operational disruption and/or financial loss. Our insurance may not protect us against suchoccurrences. Consequently, it is possible that any of these occurrences, or a combination of them, could have a material adverse effect on our business, financialcondition and results of operations.The oil and natural gas industry has become increasingly dependent upon digital technologies, including information systems, infrastructure and cloudapplications and services, to operate our businesses, process and record financial and operating data, communicate with our employees and business partners,analyze seismic and drilling information, estimate quantities of natural gas reserves, and perform other activities related to our businesses. Our business partners,including vendors, service providers, and financial institutions, are also dependent on digital technology.As dependence on digital technologies has increased, cyber incidents, including deliberate attacks or unintentional events, have also increased. A cyber-attackcould include gaining unauthorized access to digital systems for purposes of misappropriating assets or sensitive information, corrupting data, or causingoperational disruption, or result in denial-of-service on websites.Our technologies, systems, networks, and those of our business partners may become the target of cyber-attacks or information security breaches that couldresult in the unauthorized release, gathering, monitoring, misuse, loss or destruction of proprietary and other information, or other disruption of our businessoperations. In addition, certain cyber incidents, such as surveillance, may remain undetected for an extended period.Deliberate attacks on our assets, or security breaches in our systems or infrastructure, the systems or infrastructure of third-parties or the cloud could lead tocorruption or loss of our proprietary data and potentially sensitive data, delays in production or delivery, difficulty in completing and settling transactions,challenges in maintaining our books and records, environmental damage, communication interruptions, other operational disruptions and third-party liability,including the following:•a cyber-attack on a vendor or service provider could result in supply chain disruptions which could delay or halt development of additionalinfrastructure, effectively delaying the start of cash flows from the project;•a cyber-attack on our facilities may result in equipment damage or failure;•a cyber-attack on mid-stream or downstream pipelines could prevent our product from being delivered, resulting in a loss of revenues;•a cyber-attack on a communications network or power grid could cause operational disruption resulting in loss of revenues;•deliberate corruption of our financial or operational data could result in events of non-compliance which could lead to regulatory fines or penalties; and•business interruptions could result in expensive remediation efforts, distraction of management, damage to our reputation, or a negative impact on theprice of our units.Implementation of various controls and processes to monitor and mitigate security threats and to increase security for our information, facilities andinfrastructure is costly and labor intensive. Moreover, there can be no assurance that such measures will be sufficient to prevent security breaches from occurring.As cyber threats continue to evolve, we may be required to expend significant additional resources to continue to modify or enhance our protective measures or toinvestigate and remediate any information security vulnerabilities. We are not aware that any such breaches have occurred.We are the subject of putative class action lawsuits that may result in substantial expenditures and divert management's attention.We are the subject of putative class action lawsuits in Oklahoma with respect to the alleged failure to pay interest with on untimely royalty payments andwith respect to the alleged underpayment of royalties. These lawsuits seek various remedies, including damages, injunctive relief, and attorney’s fees. Foradditional information on these lawsuits, see Item 3 Legal Proceedings in this Annual Report on Form 10-K.Although we believe that the allegations in these lawsuits are without merit and intend to defend such litigation vigorously, litigation is subject to inherentuncertainties, and an adverse result in one of these lawsuits or other matters that may arise from time to time could have a material adverse effect on our business,results of operations and financial condition.38Table of ContentsDefending the lawsuits may be costly and, further, could require significant involvement of our senior management and may divert management's attention fromour business and operations.Item 1B. Unresolved Staff CommentsNone.Item 2. PropertiesThe information called for by this item was consolidated with and disclosed in connection with Item 1 above.Item 3. Legal ProceedingsPanola Independent School District No. 4, et al . v. Unit Petroleum Company , No. CJ-07-215, District Court of Latimer County, Oklahoma.Panola Independent School District No. 4, Michael Kilpatrick, Gwen Grego, Carla Lessel, Thelma Christine Pate, Juanita Golightly, Melody Culberson, andCharlotte Abernathy are the Plaintiffs and are royalty owners in oil and gas drilling and spacing units for which the company’s exploration segment distributesroyalty. The Plaintiffs’ central allegation is that the company’s exploration segment has underpaid royalty obligations by deducting post-production costs ormarketing related fees. Plaintiffs sought to pursue the case as a class action on behalf of persons who receive royalty from us for our Oklahoma production. Wehave asserted several defenses including that the deductions are permitted under Oklahoma law. We have also asserted that the case should not be tried as a classaction due to the materially different circumstances that determine what, if any, deductions are taken for each lease. On December 16, 2009, the trial court enteredits order certifying the class. On May 11, 2012 the court of civil appeals reversed the trial court’s order certifying the class. The Plaintiffs petitioned the SupremeCourt for certiorari and on October 8, 2012, the Plaintiff’s petition was denied. On January 22, 2013, the Plaintiffs filed a second request to certify a class ofroyalty owners slightly smaller than their first attempt. Since then, the Plaintiffs have further amended their proposed class to just include royalty owners entitled toroyalties under certain leases in Latimer, Le Flore, and Pittsburg Counties, Oklahoma. In July 2014, a second class certification hearing was held where, besidesthe defenses described above, we argued that the amended class definition is still deficient under the court of civil appeals opinion reversing the initial classcertification. Closing arguments were held on December 2, 2014. There is no timetable for when the court will issue its ruling. The merits of Plaintiffs’ claims willremain stayed while class certification issues are pending.Cockerell Oil Properties, Ltd., v. Unit Petroleum Company , No. 16-cv-135-JHP, United States District Court for the Eastern District of Oklahoma.On March 11, 2016, a putative class action lawsuit was filed against Unit Petroleum Company styled Cockerell Oil Properties, Ltd., v. Unit PetroleumCompany in LeFlore County, Oklahoma. We removed the case to federal court in the Eastern District of Oklahoma. The plaintiff alleges that Unit Petroleumwrongfully failed to pay interest with respect to untimely royalty payments under Oklahoma’s Production Revenue Standards Act. The lawsuit seeks actual andpunitive damages, an accounting, disgorgement, injunctive relief, and attorney’s fees. Plaintiff is seeking relief on behalf of royalty owners in our Oklahoma wells.We have asserted several defenses including that the case cannot be properly certified as a class action because of the wide variety of circumstances that determinewhether a royalty payment was timely made or has accrued interest under Oklahoma law. At this point, the court has not taken any action on the issue of classcertification.Chieftain Royalty Company v. Unit Petroleum Company , No. CJ-16-230, District Court of LeFlore County, Oklahoma.On November 3, 2016, a putative class action lawsuit was filed against Unit Petroleum Company styled Chieftain Royalty Company v. Unit PetroleumCompany in LeFlore County, Oklahoma. Plaintiff alleges that Unit Petroleum breached its duty to pay royalties on natural gas used for fuel off the lease premises.The lawsuit seeks actual and punitive damages, an accounting, injunctive relief, and attorney’s fees. Plaintiff is seeking relief on behalf of Oklahoma citizens whoare or were royalty owners in our Oklahoma wells. We filed a motion to dismiss on the basis that the claims asserted by the Plaintiff and the putative class arebarred because they have already been asserted by the putative class in the Panola lawsuit and are subject to its reversal of class certification. The court denied ourmotion to dismiss and we have asked the court to certify its order so that it can be immediately appealed. That issue is still pending before the court. If we do notultimately prevail on our claim of issue preclusion, we have several other defenses, including that the case cannot be properly certified as a class action because ofthe wide variety of circumstances that determine whether a royalty payment was wrongfully withheld. At this point, the issue of class certification has not been setbefore the court.39Table of ContentsWe continue to vigorously defend against each of the pending claims. At this time we are unable to express an opinion with respect to the likelihood of anunfavorable outcome or provide an estimate of potential losses, if any.Item 4. Mine Safety DisclosuresNot applicable.PART IIItem 5. Market for the Registrant’s Common Equity, Related Stockholder Matters, and Issuer Purchases of Equity SecuritiesOur common stock trades on the New York Stock Exchange under the symbol “UNT.” This table identifies the high and low closing sales prices per share ofour common stock for the periods indicated: 2017 2016QuarterHigh Low High LowFirst$30.25 $20.73 $12.51 $4.41Second$24.26 $16.47 $17.81 $8.44Third$21.55 $15.42 $18.82 $11.29Fourth$22.83 $17.20 $28.11 $16.44On February 13, 2018 , the closing sale price of our common stock, as reported by the NYSE, was $20.16 per share. On that date, there were approximately793 holders of record of our common stock.We have declared no cash dividends on our common stock. Any future determination by our board of directors to pay dividends on our common stock willbe made only after considering our financial condition, results of operations, capital requirements, and other relevant factors. Our bank credit agreement and theNotes prohibit the payment of cash dividends on our common stock under certain circumstances. For further information regarding our bank credit agreement andthe Notes agreement’s impact on our ability to pay dividends see “Our Credit Agreement and Senior Subordinated Notes” under Item 7 of this report.40Table of ContentsPerformance Graph. The following graph and related information shall not be deemed “soliciting material” or be deemed to be “filed” with the SEC, norwill this information be incorporated by reference into any future filing, except to the extent that we specifically incorporate it by reference into that filing.Set forth below is a line graph comparing our cumulative total shareholder return on our common stock with the cumulative total return of the S&P 500Stock Index, S&P 600 Oil and Gas Exploration & Production and our peer group which includes Helmerich & Payne, Inc., Patterson – UTI Energy Inc., andPioneer Energy Services Corp. The graph below assumes an investment of $100 at the beginning of the period. The shareholder return set forth below is notnecessarily indicative of future performance.41Table of ContentsItem 6. Selected Financial DataThe following table shows selected consolidated financial data. The data should be read in conjunction with Item 7 “Management’s Discussion and Analysisof Financial Condition and Results of Operations,” for a review of 2017 , 2016 , and 2015 activity. As of and for the Year Ended December 31, 2017 2016 2015 2014 2013 (In thousands except per share amounts) Revenues$739,640 $602,177 $854,231 $1,572,944 $1,351,850 Net income (loss)$117,848 $(135,624)(3) $(1,037,361)(2) $136,276(1) $184,746 Net income (loss) per common share: Basic$2.31 $(2.71) $(21.12) $2.80 $3.83 Diluted$2.28 $(2.71) $(21.12) $2.78 $3.80 Total assets$2,581,452 $2,479,303(3) $2,799,842(2) $4,463,473(1) $4,010,546 Long-term debt (4)$820,276 $800,917 $918,995 $801,908 $633,852 Other long-term liabilities (5)$100,203 $103,479 $140,626 $148,785 $158,331 Cash dividends per common share$— $— $— $— $— _________________________ (1)In December 2014, we incurred a non-cash ceiling test write-down of our oil and natural gas properties of $76.7 million pre-tax ( $47.7 million , net of tax), a non-cash write-downassociated with the removal of 31 drilling rigs from our fleet along with certain other equipment and drill pipe of pre-tax $74.3 million pre-tax ($46.3 million, net of tax), and a non-cashwrite-down associated with a reduction in the carrying value of three mid-stream segment systems of $7.1 million pre-tax ($4.4 million, net of tax).(2)In total for 2015, we incurred non-cash ceiling test write-downs on our oil and natural gas properties of $1.6 billion pre-tax ( $1.0 billion , net of tax). We also incurred a non-cash write-down on certain drilling rigs and other equipment of approximately $8.3 million pre-tax ($5.1 million, net of tax), and a non-cash write-down associated with a reduction in the carryingvalue of three mid-stream segment systems of $27.0 million pre-tax ($16.8 million, net of tax).(3)For the first three quarters of 2016, we incurred non-cash ceiling test write-downs on our oil and natural gas properties of $161.6 million pre-tax ( $100.6 million , net of tax).(4)Long-term debt is net of unamortized discount and debt issuance costs.(5)Includes non-current derivative liabilities, if any.42Table of ContentsItem 7. Management’s Discussion and Analysis of Financial Condition and Results of OperationsPlease read this discussion of our financial condition and results of operations with the consolidated financial statements and related notes in Item 8 ofthis report.GeneralWe operate, manage, and analyze our results of operations through our three principal business segments:•Oil and Natural Gas – carried out by our subsidiary Unit Petroleum Company. This segment explores, develops, acquires, and produces oil and naturalgas properties for our own account.•Contract Drilling – carried out by our subsidiary Unit Drilling Company. This segment contracts to drill onshore oil and natural gas wells for others andfor our own account.•Mid-Stream – carried out by our subsidiary Superior Pipeline Company, L.L.C. and its subsidiaries. This segment buys, sells, gathers, processes, andtreats natural gas for third parties and for our own account.Business OutlookAs discussed in other parts of this report, our success depends, to a large degree, on the prices we receive for our oil and natural gas production, the demandfor oil, natural gas, and NGLs, and the demand for our drilling rigs which influences the amounts we can charge for those drilling rigs. While our operations arewithin the United States, events outside the United States affect us and our industry.Deteriorating commodity prices worldwide during the past several years brought about significant and adverse changes to our industry and us. As a result wereduced or stopped, for a time, our oil and natural gas segment's drilling activity. Industry wide reductions in drilling activity and spending for extended periodsalso reduces the rates for and the number of our drilling rigs we can work. In addition, sustained lower commodity prices impact the liquidity condition of some ofour industry partners and customers, which could limit their ability to meet their financial obligations to us.During 2016, commodity prices improved. In the fourth quarter of 2016, our oil and natural gas segment began using two of our drilling rigs and has beenusing two to three drilling rigs throughout 2017. Our contract drilling segment completed the construction and contracted the ninth and tenth BOSS drilling rigs inthe fourth quarter of 2016 and the second quarter of 2017, respectively. Our drilling rig segment's rig utilization increased from 16 drilling rigs working as of June30, 2016, to 31 drilling rigs working as of December 31, 2017. The extent and duration of this improvement remains uncertain.The reduction in oil, NGLs, and natural gas prices had several consequences for us (although, as noted, we are seeing improvements). Below are some ofthose consequences:•We incurred non-cash ceiling test write-downs in the first nine months of 2016 of $161.6 million ($100.6 million net of tax). We had no write-downsduring 2017. It is hard to predict with any reasonable certainty the need for or amount of any future impairments given the many factors that go into theceiling test calculation including, future pricing, operating costs, drilling and completion costs, upward or downward oil and gas reserve revisions, oil andgas reserve additions, and tax attributes. Subject to these inherent uncertainties, if we hold these same factors constant as they existed at December 31,2017, and only adjust the 12-month average price to an estimated first quarter ending average (holding February 2018 prices constant for the remainingone month of the first quarter of 2018), our forward looking expectation is that we will not recognize an impairment in the first quarter of 2018. Butcommodity prices (and other factors) remain volatile and they could negatively affect the 12-month average price resulting in the potential for a futureimpairment.•The number of gross wells our oil and gas segment drilled in 2017 verses 2016 increased from 21 wells to 70 wells due to increased cash flow. For 2018,we plan to increase the number of gross wells drilled to 75-85 wells (depending on future commodity prices).•The decline in drilling by our customers reduced the average use of our drilling rig fleet. At December 31, 2015, we had 26 drilling rigs operating. In2016, utilization continued downward bottoming out in May at 13 operating drilling rigs. After May commodity prices improved for the remainder of theyear and we exited 2016 with 21 active rigs. As of December 31, 2017, we had 31 drilling rigs operating. Operators have been increasing drilling, but theextent of further increases remains uncertain. As of December 31 2017, all ten of our BOSS drilling rigs were under contract.43Table of Contents•Due to low ethane price, we continue to operate some of our mid-stream processing facilities in ethane rejection mode which reduces the liquids sold. Ifethane price relative to natural gas price remains depressed, we expect to continue operating in ethane rejection mode at some of our processing facilities.Also, as noted elsewhere, beginning on April 4, 2017, we began an at-the-market offering for the sale of shares of our common stock. The offering allows usto sell shares, from time to time, up to an aggregate of $100.0 million in gross proceeds. As of December 31, 2017, we sold 787,547 shares for $18.6 million, net ofoffering costs of $0.4 million. Approximately $81.0 million remain available for sale under the program. Net proceeds from the offering will fund (or offset costsof) acquisitions, future capital expenditures, repay amounts outstanding under our revolving credit facility, and general corporate purposes.On April 3, 2017, we closed an acquisition of certain oil and natural gas assets from an unrelated third party. The acquisition included approximately 47proved developed producing wells and 8,300 net acres primarily in Grady and Caddo Counties in western Oklahoma. The final adjusted value of considerationgiven was $54.3 million. The effective date of this acquisition was January 1, 2017.Executive SummaryOil and Natural GasFourth quarter 2017 production from our oil and natural gas segment was 4,310 MBoe, an increase of 6% over the third quarter of 2017 and an increase of2% over the fourth quarter of 2016 . The increases mostly came from acquired wells and new wells drilled in 2017. Oil and NGLs production during the fourthquarter of 2017 was 46% of our total production compared to 47% of our total production during the fourth quarter of 2016 .Fourth quarter 2017 oil and natural gas revenues increase d 19% over the third quarter of 2017 and increase d 15% over the fourth quarter of 2016 . Theseincreases were primarily due to higher oil and NGLs prices and higher oil and natural gas production volumes.Our NGLs, oil, and natural gas prices for the fourth quarter of 2017 increase d 19% , 15% , and 1% , respectively, compared to the third quarter of 2017 . OurNGLs and oil prices increase d 50% and 18% , respectively, compared to the fourth quarter of 2016 , while our natural gas prices were essentially unchanged.Direct profit (oil and natural gas revenues less oil and natural gas operating expense) increase d 29% over the third quarter of 2017 and 10% over the fourthquarter of 2016 . The increase s were primarily due to higher revenues due to rising commodity prices and production volumes.Operating cost per Boe produced for the fourth quarter of 2017 decrease d 3% from the third quarter of 2017 and increase d 24% over the fourth quarter of2016 . The decrease from the third quarter of 2017 was primarily due to higher production volumes. The increase over the fourth quarter of 2016 was primarily dueto higher lease operating expenses (LOE), gross production taxes, general and administrative expenses offset partially by higher production.44Table of ContentsAt December 31, 2017 , these non-designated hedges were outstanding:Term Commodity Contracted Volume Weighted Average Fixed Price for Swaps Contracted MarketJan’18 – Dec’18 Natural gas – swap 20,000 MMBtu/day $3.013 IF – NYMEX (HH)Apr'18 – Oct'18 Natural gas – swap 10,000 MMBtu/day $2.990 IF – NYMEX (HH)Jan’18 – Mar'18 Natural gas – basis swap 10,000 MMBtu/day $(0.208) IF – NYMEX (HH)Nov’18 – Dec'18 Natural gas – basis swap 10,000 MMBtu/day $(0.208) IF – NYMEX (HH)Jan’18 – Mar'18 Natural gas – three-way collar 60,000 MMBtu/day $3.29 - $2.63 - $4.07 IF – NYMEX (HH)Apr’18 – Dec'18 Natural gas – three-way collar 20,000 MMBtu/day $3.00 - $2.50 - $3.51 IF – NYMEX (HH)Jan’18 – Dec'18 Crude oil – swap 3,000 Bbl/day $51.36 WTI – NYMEXJan’18 – Mar'18 Crude oil – collar 500 Bbl/day $55.00 - $59.50 WTI – NYMEXJan’18 – Dec'18 Crude oil – three-way collar 2,000 Bbl/day $47.50 - $37.50 - $56.08 WTI – NYMEXApr’18 – Sep'18 Liquids (Propane) – swap 1,000 Bbl/day $31.16 MONT BELVIEUAfter December 31, 2017 , these non-designated hedges were entered into:Term Commodity Contracted Volume Weighted Average Fixed Price for Swaps Contracted MarketApr’18 – Sep'18 Natural gas – swap 10,000 MMBtu/day $2.925 IF – NYMEX (HH)Apr’18 – Sep'18 Natural gas – collar 30,000 MMBtu/day $2.67 - $2.97 IF – NYMEX (HH)Feb’18 – Dec'18 Natural gas – basis swap 10,000 MMBtu/day $(0.678) PEPLFeb’18 – Dec'18 Natural gas – basis swap 10,000 MMBtu/day $(0.568) NGPL MIDCONApr’18 – Oct'18 Natural gas – basis swap 10,000 MMBtu/day $(0.190) NGPL TEXOKJan'19 – Dec'19 Natural gas – basis swap 10,000 MMBtu/day $(0.728) PEPLJan'19 – Dec'19 Natural gas – basis swap 10,000 MMBtu/day $(0.625) NGPL MIDCONJan'19 – Dec'19 Natural gas – basis swap 20,000 MMBtu/day $(0.273) NGPL TEXOKJan'20 – Dec'20 Natural gas – basis swap 20,000 MMBtu/day $(0.280) NGPL TEXOKApr'18 – Dec'18 Crude oil – swap 1,000 Bbl/day $60.00 WTI – NYMEXApr’18 – Sep'18 Liquids – swap 500 Bbl/day $34.10 MONT BELVIEUDuring 2017 , we participated in the drilling of 70 wells ( 25.71 net wells). For 2018 , we plan to participate in the drilling of approximately 75 to 85 grosswells. Our 2018 production guidance is approximately 17.1 to 17.4 MMBoe, an increase of 7 - 9% over 2017 , actual results will be subject to many factors. Thissegment’s capital budget for 2018 is approximately $272.0 million , a 26% increase over 2017 , excluding acquisitions and ARO liability.Contract DrillingThe average number of drilling rigs we operated in the fourth quarter was 31.2 compared to 34.6 and 19.5 in the third quarter of 2017 and fourth quarter of2016, respectively. As of December 31, 2017, 31 of our drilling rigs were operating.Revenue for the fourth quarter of 2017 decrease d 10% from the third quarter of 2017 and increase d 40% over the fourth quarter of 2016 . The decrease fromthe third quarter of 2017 was primarily due to fewer drilling rigs operating offset slightly by higher dayrates. The increase over the fourth quarter of 2016 wasprimarily due to more drilling rigs operating partially offset by lower dayrates.Dayrates for the fourth quarter of 2017 averaged $16,645 , a 1% increase over the third quarter of 2017 and a 1% decrease from the fourth quarter of 2016 .The increase over the third quarter of 2017 was primarily due to a labor increase that was passed through to contracted rigs. The decrease from the fourth quarter of2016 was primarily due to downward pressure on dayrates due to lower demand as higher rate contracts were expiring.45Table of ContentsOperating costs for the fourth quarter of 2017 decrease d 10% from the third quarter of 2017 and increase d 45% over the fourth quarter of 2016 . Thedecrease from the third quarter of 2017 was primarily due to fewer drilling rigs operating while the increase over the fourth quarter of 2016 was primarily due tomore drilling rigs operating.Direct profit (contract drilling revenue less contract drilling operating expense) for the fourth quarter of 2017 decrease d 9% from the third quarter of 2017and increase d 31% over the fourth quarter of 2016 . The decrease from the third quarter of 2017 was primarily due to fewer drilling rigs operating while theincrease over the fourth quarter of 2016 was primarily due to more drilling rigs operating.Operating cost per day for the fourth quarter of 2017 was essentially unchanged from the third quarter of 2017 and decrease d 9% from the fourth quarter of2016 . The decrease from the fourth quarter of 2016 was primarily due to an increase in drilling rigs operating.During 2017, almost all of our working drilling rigs were drilling horizontal or directional wells for oil and NGLs. The future demand for and the availabilityof drilling rigs to meet that demand will affect our future dayrates.As of December 31, 2017 , we had nine term drilling contracts with original terms ranging from six months to two years . Eight of these contracts are up forrenewal in 2018 , ( four in the first quarter, three in the second quarter, and one in the fourth quarter) and one is up for renewal in 2019 . Term contracts maycontain a fixed rate during the contract or provide for rate adjustments within a specific range from the existing rate. Some operators who had signed term contractshave opted to release the drilling rig and pay an early termination penalty for the remaining term of the contract. We recorded $0.8 million, $3.1 million, and $29.0million in early termination fees in 2017, 2016, and 2015, respectively.All ten of our existing BOSS drilling rigs are under contract.Our anticipated 2018 capital expenditures for this segment are approximately $47.0 million , a 30% increase over 2017 .Mid-StreamFourth quarter 2017 liquids sold per day increase d 10% and 9% over the third quarter of 2017 and the fourth quarter of 2016 , respectively. The increaseswere due primarily to more processed volume due to connecting additional wells to our systems. For the fourth quarter of 2017 , gas processed per day increase d6% and 5% over the third quarter of 2017 and the fourth quarter of 2016 , respectively. The increases were due to connecting additional wells to our processingsystems. For the fourth quarter of 2017 , gas gathered per day was essentially unchanged from the third quarter of 2017 and decrease d 10% from the fourth quarterof 2016 . The decrease from the fourth quarter of 2016 was primarily due to declining volumes from the Appalachian region.NGLs prices in the fourth quarter of 2017 increase d 17% and 44% over the prices received in the third quarter of 2017 and the fourth quarter of 2016 ,respectively. Because certain of the contracts used by our mid-stream segment for NGLs transactions are commodity-based contracts – under which we receive ashare of the proceeds from the sale of the NGLs – our revenues from those commodity-based contracts fluctuate based on NGLs prices.Direct profit (mid-stream revenues less mid-stream operating expense) for the fourth quarter of 2017 decrease d 2% and 11% from the third quarter of 2017and fourth quarter of 2016 , respectively. The decrease from the third quarter was primarily due to a demand fee expiring in the fourth quarter of 2017 at ourPittsburgh Mills facility. The decrease from the fourth quarter of 2016 was also primarily due to the expiring demand fee at our Pittsburgh Mills facility in thefourth quarter of 2017 along with a short-fall fee that was recognized in the fourth quarter of 2016. Total operating cost for this segment for the fourth quarter of2017 increase d 14% over both the third quarter of 2017 and the fourth quarter of 2016 , respectively due primarily to the combination of the higher cost of gaspurchased and increased purchase volumes.46Table of ContentsAt our Cashion processing facility in central Oklahoma, our total throughput volume for the fourth quarter of 2017 averaged approximately 37.3 MMcf perday and our total production of natural gas liquids increased to approximately 198,600 gallons per day. The total processing capacity at this facility isapproximately 45 MMcf per day. During 2017, we connected 12 new wells to this system from three producers. We are continuing a pipeline extension project fora producer scheduled to actively drill in the Cashion area in 2018. We have already connected four new wells from this producer and anticipate connecting severalmore wells throughout 2018. As volume increases on this system, we will evaluate the need to add additional processing capacity. If volume continues to increase,we may need to add an additional processing plant in the Cashion area.At our Hemphill processing facility in the Texas panhandle, our average gathered volume for the fourth quarter of 2017 was approximately 68.5 MMcf perday and our total production of natural gas liquids increased to 188,600 gallons per day. During 2017, we connected six new wells to this processing system withseveral more wells scheduled to be connected in the first part of 2018. We have completed construction of the pipeline to connect the next well pad and we areupgrading our compression facilities to handles the expected additional volume.At our Bellmon processing facility in the Mississippian play in north central Oklahoma, during 2017 we connected 14 new wells to this system. Our totalthroughput volume for the fourth quarter of 2017 averaged approximately 27 MMcf per day. We have two processing skids available that provide total processingcapacity of 90 MMcf per day. At our Segno gathering facility in Southeast Texas, our average gathered volume for the fourth quarter of 2017 was approximately 86.4 MMcf per day. Thegathering and dehydration capacity for this facility is approximately 120 MMcf per day. During 2017, we connected three new wells to this gathering system alongwith additional volume from recompletion activity in the area around our system.In the Appalachian region, at our Pittsburgh Mills gathering system, we continue to connect new well pads to this system. During 2017, we connected onenew well pad with five new wells to this gathering system. By adding these new wells our average gathered volume for the fourth quarter was approximately 117.2MMcf per day. We are constructing a new pipeline to connect the next well pad to this system. Most of the preliminary environmental and permitting activitieshave been completed and right of way has been obtained. In the first quarter of 2018, we will start the construction of the pipeline with an expected completiondate in the third quarter of 2018. This new well pad is expected to have seven wells drilled and we anticipate receiving gas from this pad at the end of 2018. Thiswell pad is on the south end of our system and will be connected to our Kissick compressor station. And we have been notified by the producer they will drill seveninfill wells on already existing pads in 2018.Anticipated 2018 capital expenditures for this segment are approximately $32.0 million , a 44% increase over 2017 .Critical Accounting Policies and EstimatesSummaryIn this section, we identify those critical accounting policies we follow in preparing our financial statements and related disclosures. Many policies require usto make difficult, subjective, and complex judgments while making estimates of matters inherently imprecise. Some accounting policies involve judgments anduncertainties to such an extent there is reasonable likelihood that materially different amounts could have been reported under different conditions, or had differentassumption been used. We evaluate our estimates and assumptions regularly. We base our estimates on historical experience and various other assumptions webelieve are reasonable under the circumstances, the results of which support making judgments about the carrying values of assets and liabilities not readilyapparent from other sources. Actual results may differ from these estimates and assumptions used in preparation of our financial statements. In this discussion weattempt to explain the nature of these estimates, assumptions and judgments, and the likelihood that materially different amounts would be reported in our financialstatements under different conditions or using different assumptions.47Table of ContentsThis table lists the critical accounting policies, identifies the estimates and assumptions that can have a significant impact on applying of these accountingpolicies, and the financial statement accounts affected by these estimates and assumptions.Accounting Policies Estimates or Assumptions Accounts AffectedFull cost method of accounting for oil, NGLs, andnatural gas properties • Oil, NGLs, and natural gas reserves, estimates,and related present value of future net revenues• Valuation of unproved properties• Estimates of future development costs • Oil and natural gas properties• Accumulated depletion, depreciation andamortization• Provision for depletion, depreciation andamortization• Impairment of oil and natural gas properties• Long-term debt and interest expense Accounting for ARO for oil, NGLs, and natural gasproperties • Cost estimates related to the plugging andabandonment of wells• Timing of cost incurred• Credit adjusted risk free rate • Oil and natural gas properties• Accumulated depletion, depreciation andamortization• Provision for depletion, depreciation andamortization• Current and non-current liabilities• Operating expense Accounting for impairment of long-lived assets • Forecast of undiscounted estimated future netoperating cash flows • Drilling and mid-stream property and equipment• Accumulated depletion, depreciation andamortization• Provision for depletion, depreciation andamortization Goodwill • Forecast of discounted estimated future netoperating cash flows• Terminal value• Weighted average cost of capital • Goodwill Accounting for value of stock compensationawards • Estimates of stock volatility• Estimates of expected life of awards granted• Estimates of rates of forfeitures• Estimates of performance shares granted • Oil and natural gas properties• Shareholder’s equity• Operating expenses• General and administrative expenses Accounting for derivative instruments • Derivatives measured at fair value • Current and non-current derivative assets andliabilities• Gain (loss) on derivativesSignificant Estimates and AssumptionsFull Cost Method of Accounting for Oil, NGLs, and Natural Gas Properties. Determining our oil, NGLs, and natural gas reserves is a subjective process. Itentails estimating underground accumulations of oil, NGLs, and natural gas that cannot be measured in an exact manner. Accuracy of these estimates depends onseveral factors, including, the quality and availability of geological and engineering data, the precision of the interpretations of that data, and individual judgments.Each year, we hire an independent petroleum engineering firm to audit our internal evaluation of our reserves. The audit of our reserve wells or locations as ofDecember 31, 2017 covered those that we projected to comprise 83% of the total proved developed future net income discounted at 10% and 86% of the totalproved discounted future net income (based on the SEC's unescalated pricing policy). Included in Part I, Item 1 of this report are the qualifications of ourindependent petroleum engineering firm and our employees responsible for preparing our reserve reports.48Table of ContentsAs a rule, the accuracy of estimating oil, NGLs, and natural gas reserves varies with the reserve classification and the related accumulation of available data,as shown in this table:Type of Reserves Nature of Available Data Degree of Accuracy Proved undeveloped Data from offsetting wells, seismic data Less accurate Proved developed non-producing The above and logs, core samples, well tests, pressure data More accurate Proved developed producing The above and production history, pressure data over time Most accurateAssumptions of future oil, NGLs, and natural gas prices and operating and capital costs also play a significant role in estimating these reserves and theestimated present value of the cash flows to be received from the future production of those reserves. Volumes of recoverable reserves are influenced by theassumed prices and costs due to the economic limit (that point when the projected costs and expenses of producing recoverable oil, NGLs, and natural gas reservesis greater than the projected revenues from the oil, NGLs, and natural gas reserves). But more significantly, the estimated present value of the future cash flowsfrom our oil, NGLs, and natural gas reserves is sensitive to prices and costs and may vary materially based on different assumptions. Companies, like ours, usingfull cost accounting use the unweighted arithmetic average of the commodity prices existing on the first day of each of the 12 months before the end of thereporting period to calculate discounted future revenues, unless prices were otherwise determined under contractual arrangements.We compute DD&A on a units-of-production method. Each quarter, we use these formulas to compute the provision for DD&A for our producing properties:•DD&A Rate = Unamortized Cost / End of Period Reserves Adjusted for Current Period Production•Provision for DD&A = DD&A Rate x Current Period ProductionUnamortized cost includes all capitalized costs, estimated future expenditures to be incurred in developing proved reserves and estimated dismantlement andabandonment costs, net of estimated salvage values less accumulated amortization, unproved properties, and equipment not placed in service.Oil, NGLs, and natural gas reserve estimates have a significant impact on our DD&A rate. If future reserve estimates for a property or group of propertiesare revised downward, the DD&A rate will increase because of the revision. If reserve estimates are revised upward, the DD&A rate will decrease. Based on our2017 production level of 16.0 MMBoe, a decrease in our 2017 oil, NGLs, and natural gas reserves by 5% would increase our DD&A rate by $0.36 per Boe andwould decrease pre-tax income by $5.8 million annually. Conversely, an increase in our 2017 oil, NGLs, and natural gas reserves by 5% would decrease ourDD&A rate by $0.30 per Boe and would increase pre-tax income by $4.8 million annually.The DD&A expense on our oil and natural gas properties is calculated each quarter using period end reserve quantities adjusted for period production.We account for our oil and natural gas exploration and development activities using the full cost method of accounting. Under this method, we capitalize allcosts incurred in the acquisition, exploration, and development of oil and natural gas properties. At the end of each quarter, the net capitalized costs of our oil andnatural gas properties are limited to that amount which is the lower of unamortized costs or a ceiling. The ceiling is defined as the sum of the present value (using a10% discount rate) of the estimated future net revenues from our proved reserves (based on the unescalated 12-month average price on our oil, NGLs, and naturalgas adjusted for any cash flow hedges), plus the cost of properties not being amortized, plus the lower of the cost or estimated fair value of unproved propertiesincluded in the costs being amortized, less related income taxes. If the net capitalized costs of our oil and natural gas properties exceed the ceiling, we are requiredto write-down the excess amount. A ceiling test write-down is a non-cash charge to earnings. If required, it reduces earnings and impacts shareholders’ equity inthe period of occurrence and results in lower DD&A expense in future periods. Once incurred, a write-down cannot be reversed.The risk we will be required to write-down the carrying value of our oil and natural gas properties increases when the prices for oil, NGLs, and natural gasare depressed or if we have large downward revisions in our estimated proved oil, NGLs, and natural gas reserves. Application of these rules during periods ofrelatively low prices, even if temporary, increases the49Table of Contentschance of a ceiling test write-down. At December 31, 2017 , our reserves were calculated based on applying 12-month 2017 average unescalated prices of $51.34per barrel of oil, $31.83 per barrel of NGLs, and $2.98 per Mcf of natural gas (then adjusted for price differentials) over the estimated life of each of our oil andnatural gas properties. We had no ceiling test write-down for 2017.It is hard to predict with any reasonable certainty the need for or amount of any future impairments given the many factors that go into the ceiling testcalculation including, but not limited to, future pricing, operating costs, drilling and completion costs, upward or downward oil and gas reserve revisions, oil andgas reserve additions, and tax attributes. Subject to these inherent uncertainties, if we hold these same factors constant as they existed at December 31, 2017 andonly adjust the 12-month average price to an estimated first quarter ending average (holding February 2018 prices constant for the remaining one month of the firstquarter of 2018), our forward looking expectation is that we will not recognize an impairment in the first quarter of 2018. But commodity prices (and other factors)remain volatile and they could negatively affect the 12-month average price resulting in the potential for an impairment in the first quarter.We use the sales method for recording natural gas sales. This method allows for the recognition of revenue, which may be more or less than our share of pro-rata production from certain wells. Our policy is to expense our pro-rata share of lease operating costs from all wells as incurred. The expenses relating to the wellsin which we have a production imbalance are not material.Costs Withheld from Amortization. Costs associated with unproved properties are excluded from our amortization base until we have evaluated theproperties. The costs associated with unevaluated leasehold acreage and related seismic data, wells drilling and capitalized interest are initially excluded from ouramortization base. Leasehold costs are transferred to our amortization base with the costs of drilling a well on the lease or are assessed at least annually for possibleimpairment or reduction in value. Leasehold costs are transferred to our amortization base to the extent a reduction in value has occurred.Our decision to withhold costs from amortization and the timing of transferring those costs into the amortization base involve significant judgment and maybe subject to changes over time based on several factors, including our drilling plans, availability of capital, project economics and results of drilling on adjacentacreage. In December 2015, December 2016, and December 2017, we determined the value of certain unproved oil and gas properties were diminished (in part orin whole) based on an impairment evaluation and our anticipated future exploration plans. Those determinations resulted in $114.4 million , $7.6 million , and$10.5 million in 2015 , 2016 , and 2017, respectively of costs being added to the total of our capitalized costs being amortized. At December 31, 2017, we hadapproximately $296.8 million of costs excluded from the amortization base of our full cost pool.Accounting for ARO for Oil, NGLs, and Natural Gas Properties. We record the fair value of liabilities associated with the future plugging and abandonmentof wells. In our case, when the reserves in each of our oil or gas wells deplete or otherwise become uneconomical, we must incur costs to plug and abandon thewells. These costs are recorded in the period in which the liability is incurred (at the time the wells are drilled or acquired). We have no assets restricted to settlethese ARO liabilities. Our engineering staff uses historical experience to determine the estimated plugging costs considering the type of well (either oil or naturalgas), the depth of the well, the physical location of the well, and the ultimate productive life to determine the estimated plugging costs. A risk-adjusted discountrate and an inflation factor are used on these estimated costs to determine the current present value of this obligation. To the extent any change in theseassumptions affect future revisions and impact the present value of the existing ARO, a corresponding adjustment is made to the full cost pool.Accounting for Impairment of Long-Lived Assets. Drilling equipment, transportation equipment, gas gathering and processing systems, and other propertyand equipment are carried at cost less accumulated depreciation. Renewals and enhancements are capitalized while repairs and maintenance are expensed. Wereview the carrying amounts of long-lived assets for potential impairment annually, typically during the fourth quarter, or when events occur or changes incircumstances suggest these carrying amounts may not be recoverable. Changes that could prompt such an assessment may include equipment obsolescence,changes in the market demand for a specific asset, changes in commodity prices, periods of relatively low drilling rig utilization, declining revenue per day,declining cash margin per day, or overall changes in market conditions. Assets are determined to be impaired if a forecast of undiscounted estimated future netoperating cash flows directly related to the asset, including disposal value if any, is less than the carrying amount of the asset. If any asset is determined to beimpaired, the loss is measured as the amount by which the carrying amount of the asset exceeds its fair value. The estimate of fair value is based on the bestinformation available, including prices for similar assets. Changes in these estimates could cause us to reduce the carrying value of property and equipment. Assetimpairment evaluations are, by nature, highly subjective. They involve expectations about future cash flows generated by our assets and reflect management’sassumptions and judgments regarding50Table of Contentsfuture industry conditions and their effect on future utilization levels, dayrates, and costs. Using different estimates and assumptions could cause materiallydifferent carrying values of our assets.On a periodic basis, we evaluate our fleet of drilling rigs for marketability based on the condition of inactive rigs, expenditures that would be necessary tobring them to working condition and the expected demand for drilling services by rig type. The components comprising inactive rigs are evaluated, and thosecomponents with continuing utility to the Company’s other marketed rigs are transferred to other rigs or to its yards to be spare equipment. The remainingcomponents of these rigs are retired. During 2015, we recorded a write-down on 31 of our drilling rigs and related equipment of approximately $8.3 million pre-taxbased on the estimated market value for similar equipment from auctions sales. We then sold all 31 of these drilling rigs and some other drilling equipment tounaffiliated third parties. The proceeds from the sale of those assets, less costs to sell, was less than the $11.3 million net book value resulting in a loss of $7.3million pre-tax. No impairments were recorded in 2016 or 2017.In 2015, our mid-stream segment incurred a $27.0 million pre-tax write-down of its systems, Bruceton Mills, Spring Creek, and Midwell due to anticipatedfuture cash flow and future development around these systems not being sufficient to support their carrying value. The estimated future cash flows were less thanthe carrying value on these systems. No impairments were recorded in 2016 or 2017.Goodwill. Goodwill represents the excess of the cost of acquisitions over the fair value of the net assets acquired. Goodwill is not amortized, but animpairment test is performed at least annually to determine whether the fair value has decreased and is performed additionally when events indicate an impairmentmay have occurred. For impairment testing, goodwill is evaluated at the reporting unit level. Our goodwill is all related to our contract drilling segment, and, theimpairment test is generally based on the estimated discounted future net cash flows of our drilling segment, utilizing discount rates and other factors indetermining the fair value of our drilling segment. Inputs in our estimated discounted future net cash flows include drilling rig utilization, day rates, gross marginpercentages, and terminal value. No goodwill impairment was recorded at December 31, 2017 , 2016 , or 2015 . Based on our impairment test performed as ofDecember 31, 2017 , the fair value of our drilling segment exceeded its carrying value by 41%. A period of sustained reduced commodity prices resulting in furtherreductions in the number of our drilling rigs working and the rates we charge for them could cause a non-cash goodwill impairment in future periods.Turnkey and Footage Drilling Contracts. Because our contract drilling operations do not bear the risk of completion of a well being drilled under a“daywork” contract, we recognize revenues and expense generated under “daywork” contracts as the services are performed. Under “footage” and “turnkey”contracts we bear the risk of completion of the well, so revenues and expenses are recognized when the well is substantially completed. Substantial completion isdetermined when the well bore reaches the depth specified in the contract. The entire amount of any loss is recorded when the loss can be reasonably determined,however, any profit is recorded only at the time the well is finished. The costs of drilling contracts uncompleted at the end of the reporting period (which includesexpenses incurred on “footage” or “turnkey” contracts) are included in other current assets. We drilled no wells under turnkey or footage contracts in 2017 , 2016 ,or 2015 .Accounting for Value of Stock Compensation Awards. To account for stock-based compensation, compensation cost is measured at the grant date based onthe fair value of an award and is recognized over the service period, which is usually the vesting period. We elected to use the modified prospective method, whichrequires compensation expense to be recorded for all unvested stock options and other equity-based compensation beginning in the first quarter of adoption.Determining the fair value of an award requires significant estimates and subjective judgments regarding, among other things, the appropriate option pricingmodel, the expected life of the award and performance vesting criteria assumptions. As there are inherent uncertainties related to these factors and our judgment inapplying them to the fair value determinations, there is risk that the recorded stock compensation may not accurately reflect the amount ultimately earned by theemployee.Accounting for Derivative Instruments and Hedging. All derivatives are recognized on the balance sheet and measured at fair value. Any changes in ourderivatives' fair value before their maturity (i.e., temporary fluctuations in value) along with any derivatives settled are reported in gain (loss) on derivatives in ourConsolidated Statements of Operations.51Table of ContentsNew Accounting StandardsCompensation—Stock Compensation. The FASB issued ASU 2017-09, to clarify and reduce both (i) diversity in practice and (ii) cost and complexity whenapplying its guidance to changes in the terms of a share-based payment award. The amendment is effective for reporting periods beginning after December 15,2017. This amendment will not have a material impact on our financial statements.Intangibles—Goodwill and Other: Simplifying the Test for Goodwill Impairment. The FASB issued ASU 2017-04, to simplify the measurement of goodwill.The amendment eliminates Step 2 from the goodwill impairment test. The amendment will be effective prospectively for reporting periods beginning afterDecember 15, 2019, and early adoption is permitted. This amendment will not have a material impact on our financial statements.Business Combinations; Clarifying the Definition of a Business. The FASB issued ASU 2017-01, clarifying the definition of a business. The amendmentshould help companies and other organizations evaluate whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. Forpublic companies, the amendment is effective for annual periods beginning after December 15, 2017. This amendment will not have a material impact on ourfinancial statements.Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payments. The FASB issued ASU 2016-15, to address diversity in how certaintransactions are presented and classified in the statement of cash flows. The amendment will be effective retrospectively for reporting periods beginning afterDecember 31, 2017, and early adoption is permitted. This amendment will not have a material impact on our financial statements.Leases. The FASB has issued ASU 2016-02. The amendment will require lessees to recognize at the commencement date a lease liability, which is a lessee'sobligation to make lease payments arising from a lease, measured on a discounted basis; and a right-of-use asset, which is an asset that represents the lessee's rightto use a specified asset for the lease term. Lessor accounting is largely unchanged. For public companies, the amendment is effective for annual periods beginningafter December 15, 2018, and interim periods within those annual periods. The standard will not apply to leases of mineral rights. We are evaluating the impact thisamendment will have on our financial statements and currently evaluating a plan for implementation.Revenue from Contracts with Customers. The FASB has issued ASU 2014-09. This standard affects any entity using U.S. GAAP that either contracts withcustomers to transfer goods or services or enters into contracts for transferring nonfinancial assets unless those contracts are within the scope of other standards(e.g., insurance contracts or lease contracts). The core principle of the amendments is that an entity should recognize revenue to depict the transfer of promisedgoods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU2014-09 has been amended several times pre-issuance, which is codified in the new Topic 606, effective January 1, 2018. The guidance in this update supersedesthe revenue recognition requirements in Topic 605, Revenue Recognition, and most industry-specific guidance throughout the Industry Topics of the Codification.We adopted this standard January 1, 2018 using the modified retrospective approach, which resulted in a cumulative effect adjustment upon adoption for our mid-stream segment. This adjustment related to the timing of revenue on certain demand fees which was not material to the company. Both our oil and natural gas andcontract drilling segments had no retained earnings adjustment.The application of Topic 606 will not have a material effect on our statement of operations or our balance sheet, as the timing of revenue recognized will notbe materially modified, but additional footnote disclosures are required with respect to revenue. In our oil and natural gas segment, the classification of certaincosts as either a deduction from revenue or an expense will be determined based on when control of the commodity transfers to the customer, which would impacttotal revenue recognized, but will not affect gross profit.Part of our review included evaluation of these issues:•Based on an analysis of whether the transportation of gas is a performance obligation that occurs at a point in time or over time, the timing of when werecognize certain revenue elements will change. Specifically related to our mid-stream segment, certain fees collectible during a contract will berecognized over the life of the contract because these fees are part of the single performance obligation associated with the contract.•Certain of our contracts include promises to deliver a minimum volume of commodity to the customer over a defined period. If we do not meet thiscommitment, a deficiency fee is payable to the customer. Topic 606 requires these arrangements represent variable consideration related to the sale of thecommodity, and requires that we include an52Table of Contentsestimate of any deficiency fees expected within revenue, rather than as operating costs. In addition, we will also be required to analyze fees that arebillable for deficiencies in minimum volume commitments from customers for our mid-stream segment. In these instances, we will assess the likelihoodof earning these fees each reporting period based on the customer’s performance and recognize variable revenue when it is not expected to be subject to asignificant reversal.Our internal control framework did not materially change, but the existing internal controls have been modified to consider our new revenue recognitionpolicy effective January 1, 2018. As we implement the new standard, we have added internal controls to ensure that we adequately evaluate new contracts underthe five-step model under ASU 2014-09.Adopted StandardsIncome Taxes: Balance Sheet Classification of Deferred Taxes. The FASB has issued ASU 2015-17. This changes how deferred taxes are classified onorganizations' balance sheets. Organizations must classify all deferred tax assets and liabilities as noncurrent. The amendments apply to all organizations thatpresent a classified balance sheet. For public companies, the amendments were effective for financial statements issued for annual periods beginning afterDecember 15, 2016, and interim periods within those annual periods. The amendment requires current deferred tax assets to be combined with noncurrent deferredtax assets. We have adopted this ASU during the first quarter of 2017 on a prospective basis. Previously, we had a net current deferred tax asset now netted withour noncurrent deferred tax liability. P rior periods were not retrospectively adjusted.Compensation—Stock Compensation: Improvements to Employee Share-Based Payment Accounting. The FASB has issued ASU 2016-09. The amendmentshould improve the accounting for employee share-based payments and affect all organizations that issue share-based payment awards to their employees. Severalaspects of the accounting for share-based payment award transactions are simplified, including: (a) income tax consequences; (b) classification of awards as eitherequity or liabilities; and (c) classification on the statement of cash flows. For public companies, the amendment was effective for annual periods beginning afterDecember 15, 2016, and interim periods within those annual periods. The amendment primarily affects classification within the statement of cash flows betweenfinancial and operating activities. This did not have a material impact on our financial statements.Financial Condition and LiquiditySummary.Our financial condition and liquidity primarily depends on the cash flow from our operations and borrowings under our credit agreement. The principalfactors determining our cash flow are:•the amount of natural gas, oil, and NGLs we produce;•the prices we receive for our natural gas, oil, and NGLs production;•the demand for and the dayrates we receive for our drilling rigs; and•the fees and margins we obtain from our natural gas gathering and processing contracts.We believe we have sufficient cash flow and liquidity to meet our obligations and remain in compliance with our debt covenants for the next twelve months.Our ability to meet our debt covenants (under our credit agreement and our Indenture) and our capacity to incur additional indebtedness will depend on our futureperformance, which in turn will be affected by financial, business, economic, regulatory, and other factors. For example, lower oil, natural gas, and NGLs pricessince the last redetermination under our credit agreement could cause a redetermination of the borrowing base to a lower level and therefore reduce or limit ourability to borrow funds. We monitor our liquidity and capital resources, endeavor to anticipate potential covenant compliance issues and work with the lendersunder our credit agreement to address any of those issues ahead of time.53Table of ContentsBelow is a summary of certain financial information for the years ended December 31: 2017 2016 2015 (In thousands) Net cash provided by operating activities$279,588 $240,130 $446,944 Net cash used in investing activities(306,998) (110,971) (549,778) Net cash provided by (used in) financing activities27,218 (129,101) 102,620 Net increase (decrease) in cash and cash equivalents$(192) $58 $(214) Cash flows from Operating ActivitiesOur operating cash flow is primarily influenced by the prices we receive for our oil, NGLs, and natural gas production, the quantity of oil, NGL, and naturalgas we produce, settlements of derivative contracts, third-party demand for our drilling rigs and mid-stream services, and the rates we can charge for those services.Our cash flows from operating activities are also affected by changes in working capital.Net cash provided by operating activities during 2017 increased by $39.5 million from 2016 due primarily to higher revenues due to higher commodity pricesand higher drilling rig utilization partially offset by changes in operating assets and liabilities related to the timing of cash receipts and disbursements.Cash flows from Investing ActivitiesWe dedicate and expect to continue to dedicate a substantial portion of our capital budget to the exploration for and production of oil, NGLs, and natural gas.These expenditures are necessary to off-set the inherent production declines typically experienced in oil and gas wells.Cash flows used in investing activities increased by $196.0 million in 2017 compared to 2016. The change was due primarily to an increase in capitalexpenditures due to an oil and gas property acquisition, the restarting of our drilling program in 2017, the construction of a new BOSS drilling rig, and a decreasein the proceeds received from the disposition of assets. See additional information on capital expenditures below under Capital Requirements.Cash Flows from Financing ActivitiesCash flows provided by (used in) financing activities increased by $156.3 million in 2017 compared to 2016. The increase was primarily due to proceedsfrom the ATM common stock program coupled with an increase in net borrowing after paying down long-term debt in 2016.At December 31, 2017 , we had unrestricted cash totaling $0.7 million and had borrowed $178.0 million of the $475.0 million we have available under ourcredit agreement.54Table of ContentsBelow is a summary of certain financial information as of December 31, and for the years ended December 31: 2017 2016 2015 (In thousands) Working capital$(62,264) $(43,719) $(10,633) Long-term debt (1)$820,276 $800,917 $918,995 Shareholders’ equity (2)$1,345,560 $1,194,070 $1,313,580 Net income (loss) (2)$117,848 $(135,624) $(1,037,361) _________________________(1)Long-term debt is net of unamortized discount and debt issuance costs.(2)In 2016 and 2015, we incurred non-cash ceiling test write-downs of our oil and natural gas properties of $161.6 million , and $1.6 billion pre-tax ( $100.6 million and $1.0 billion , net oftax), respectively. In 2015, we incurred a non-cash write-down associated with the removal of 31 drilling rigs from our fleet along with certain other equipment and drill pipe of $8.3million pre-tax ($5.1 million, net of tax). In December 2015, we incurred a non-cash write-down associated with the reduction in the carrying value of three mid-stream segment gatheringsystems of $27.0 million pre-tax ($16.8 million, net of tax). The write-downs affected our shareholders’ equity, ratio of long-term debt to total capitalization, and net income (loss) for2015. There was no impact on our compliance with the covenants in our credit agreement.Working CapitalTypically, our working capital balance fluctuates, in part, because of the timing of our trade accounts receivable and accounts payable and the fluctuation incurrent assets and liabilities associated with the mark to market value of our derivative activity. We had negative working capital of $62.3 million , $43.7 million,and $10.6 million as of December 31, 2017 , 2016 , and 2015 , respectively. This is primarily due to increased accounts payable due to increased activity in ourdrilling program and increased drilling rig utilization and the reclassification of the current deferred tax asset to long-term asset per ASU 2015-17 partially offsetby increased accounts receivable from increased revenues and the change in the value of outstanding derivatives. Our credit agreement is used primarily forworking capital and capital expenditures. At December 31, 2017 , we had borrowed $178.0 million of the $475.0 million available to us under our creditagreement. The effect of our derivatives decreased working capital by $7.1 million as of December 31, 2017 , and increased working capital by $21.6 million and$10.2 million as of December 31, 2016 and 2015 , respectively.55Table of ContentsThis table summarizes certain operating information for the years ended December 31: 2017 2016 2015 Oil and Natural Gas: Oil production (MBbls)2,715 2,974 3,783 Natural gas liquids production (MBbls)4,737 5,014 5,274 Natural gas production (MMcf)51,260 55,735 65,546 Average oil price per barrel received$49.44 $40.50 $50.79 Average oil price per barrel received excluding derivatives$48.98 $39.05 $45.04 Average NGLs price per barrel received$18.35 $11.26 $10.12 Average NGLs price per barrel received excluding derivatives$18.35 $11.26 $10.12 Average natural gas price per mcf received$2.46 $2.07 $2.63 Average natural gas price per mcf received excluding derivatives$2.49 $1.98 $2.25 Contract Drilling: Average number of our drilling rigs in use during the period30.0 17.4 34.7 Total drilling rigs available for use at the end of the period95 94 94 Average dayrate$16,256 $17,784 $19,455 Mid-Stream: Gas gathered—Mcf/day385,209 419,217 353,771 Gas processed—Mcf/day137,625 155,461 182,684 Gas liquids sold—gallons/day534,140 536,494 577,513 Number of natural gas gathering systems24 25 25(1) Number of processing plants13 13 13 _________________________(1)In 2015, our mid-stream segment transferred 11 natural gas gathering systems to our oil and natural gas segment.Oil and Natural Gas OperationsAny significant change in oil, NGLs, or natural gas prices has a material effect on our revenues, cash flow, and the value of our oil, NGLs, and natural gasreserves. Generally, prices and demand for domestic natural gas are influenced by weather conditions, supply imbalances, and by worldwide oil price levels.Domestic oil prices are primarily influenced by world oil market developments. These factors are beyond our control and we cannot predict nor measure theirfuture influence on the prices we will receive.Based on our 2017 production, a $0.10 per Mcf change in what we are paid for our natural gas production, without the effect of derivatives, would cause acorresponding $410,000 per month ( $4.9 million annualized) change in our pre-tax operating cash flow. Our 2017 average natural gas price was $2.46 comparedto an average natural gas price of $2.07 for 2016 and $2.63 for 2015 . A $1.00 per barrel change in our oil price, without the effect of derivatives, would have a$217,000 per month ( $2.6 million annualized) change in our pre-tax operating cash flow and a $1.00 per barrel change in our NGLs prices, without the effect ofderivatives, would have a $380,000 per month ( $4.6 million annualized) change in our pre-tax operating cash flow based on our production in 2017 . Our 2017average oil price per barrel was $49.44 compared with an average oil price of $40.50 in 2016 and $50.79 in 2015 , and our 2017 average NGLs price per barrel was$18.35 compared with an average NGLs price of $11.26 in 2016 and $10.12 in 2015 .Because commodity prices affect the value of our oil, NGLs, and natural gas reserves, declines in those prices can cause a decline in the carrying value ofour oil and natural gas properties. At December 31, 2017, the 12-month average unescalated prices were $51.34 per barrel of oil, $31.83 per barrel of NGLs, and$2.98 per Mcf of natural gas, and then are adjusted for price differentials. We did not have to take a write down in 2017.It is hard to predict with any reasonable certainty the need for or amount of any future impairments given the many factors that go into the ceiling testcalculation including, but not limited to, future pricing, operating costs, drilling and completion costs, upward or downward oil and gas reserve revisions, oil andgas reserve additions, and tax attributes. Subject to these inherent uncertainties, if we hold these same factors constant as they existed at December 31, 2017 andonly adjust the 12-month average price to an estimated first quarter ending average (holding February 2018 prices constant for the remaining56Table of Contentsone month of the first quarter of 2018), our forward looking expectation is that we will not recognize an impairment in the first quarter of 2018. Commodity pricesremain volatile and they could negatively affect the 12-month average price and the potential for an impairment in the first quarter.Our natural gas production is sold to intrastate and interstate pipelines, to independent marketing firms and gatherers under contracts with terms generallyranging from one month to five years. Our oil production is sold to independent marketing firms generally under six-month contracts.Contract Drilling OperationsMany factors influence the number of drilling rigs we have working and the costs and revenues associated with that work. These factors include the demandfor drilling rigs in our areas of operation, competition from other drilling contractors, the prevailing prices for oil, NGLs, and natural gas, availability and cost oflabor to run our drilling rigs, and our ability to supply the equipment needed.Competition to keep qualified labor continues. We increased compensation for some rig personnel in the third quarter of 2017 and again during the firstquarter of 2018.During 2017 , almost all of our working drilling rigs were drilling horizontal or directional wells for oil and NGLs. The continuous fluctuations incommodity prices for oil and natural gas changes demand for drilling rigs. These factors ultimately affect the demand and mix of the type of drilling rigs used byour customers. The future demand for and the availability of drilling rigs to meet that demand will affect our future dayrates. For 2017 , our average dayrate was$16,256 per day compared to $17,784 and $19,455 per day for 2016 and 2015 , respectively. Our average number of drilling rigs used (utilization %) in 2017 was30.0 ( 32% ) compared with 17.4 ( 19% ) and 34.7 ( 38% ) in 2016 and 2015 , respectively. Based on the average utilization of our drilling rigs during 2017 , a$100 per day change in dayrates has a $3,000 per day ( $1.1 million annualized) change in our pre-tax operating cash flow.Our contract drilling segment provides drilling services for our exploration and production segment. Some of the drilling services we perform on ourproperties are, depending on the timing of those services, deemed associated with acquiring an ownership interest in the property. In those cases, revenues andexpenses for those services are eliminated in our statement of operations, with any profit recognized as a reduction in our investment in our oil and natural gasproperties. The contracts for these services are issued under the same conditions and rates as the contracts entered into with unrelated third parties. By providingdrilling services for the oil and natural gas segment, we eliminated revenue of $13.4 million and $22.1 million during 2017 and 2015 , respectively, from ourcontract drilling segment and eliminated the associated operating expense of $11.8 million and $18.3 million during 2017 and 2015 , respectively, yielding $1.6million and $3.8 million during 2017 and 2015 , respectively, as a reduction to the carrying value of our oil and natural gas properties. We eliminated no revenue orexpenses in our contract drilling segment during 2016.Mid-Stream OperationsThis segment is engaged primarily in the buying, selling, gathering, processing, and treating of natural gas. It operates three natural gas treatment plants, 13processing plants, 24 gathering systems, and approximately 1,455 miles of pipeline. Its operations are in Oklahoma, Texas, Kansas, Pennsylvania, and WestVirginia. This segment enhances our ability to gather and market not only our own natural gas and NGLs but also that owned by third parties and serves as amechanism through which we can construct or acquire existing natural gas gathering and processing facilities. During 2017 , 2016 , and 2015 this segmentpurchased $63.2 million , $42.7 million , and $57.6 million , respectively, of our oil and natural gas segment's natural gas and NGLs production, and providedgathering and transportation services of $6.7 million , $9.2 million , and $7.6 million , respectively. Intercompany revenue from services and purchases ofproduction between this business segment and our oil and natural gas segment has been eliminated in our consolidated financial statements.Our mid-stream segment gathered an average of 385,209 Mcf per day in 2017 compared to 419,217 Mcf per day in 2016 and 353,771 Mcf per day in 2015 .It processed an average of 137,625 Mcf per day in 2017 compared to 155,461 Mcf per day in 2016 and 182,684 Mcf per day in 2015 , and sold NGLs of 534,140gallons per day in 2017 compared to 536,494 gallons per day in 2016 and 577,513 gallons per day in 2015 . Gas gathering volumes per day in 2017 decreasedprimarily due to lower volumes from our fee-based Appalachian systems. Volumes processed decreased primarily due to lower purchased volumes and fewer newwells connected to our processing systems in 2017. NGLs sold decreased primarily due to lower purchased volumes and continuing to operate most of our systemsin ethane rejection mode.57Table of ContentsAt-the-Market (ATM) Common Stock ProgramOn April 4, 2017, we entered into a Distribution Agreement (the Agreement) with a sales agent, under which we may offer and sell, from time to time,through the sales agent shares of our common stock, par value $0.20 per share (the Shares), up to an aggregate offering price of $100.0 million. We intend to usethe net proceeds from these sales to fund (or offset costs of) acquisitions, future capital expenditures, repay amounts outstanding under our revolving credit facility,and general corporate purposes.Under the Agreement, the sales agent may sell the Shares by methods deemed to be an “at-the-market” offering as defined in Rule 415 promulgated under theSecurities Act of 1933, as amended, including sales made directly on the NYSE, on any other existing trading market for the Shares or to or through a marketmaker. In addition, under the Agreement, the sales agent may sell the Shares by any other method permitted by law, including in privately negotiated transactions.Subject to the terms of the Agreement, the sales agent will use commercially reasonable efforts, consistent with its normal trading and sales practices andapplicable state and federal law, rules and regulations and the rules of the NYSE, to sell the Shares from time to time, based on our instructions (including anyprice, time or size limits or other customary parameters or conditions we may impose).We do not have to make any sales of the Shares under the Agreement. The offering of Shares under the Agreement will terminate on the earlier of (1) the saleof all of the Shares subject to the Agreement or (2) the termination of the Agreement by the sales agent or us. We will pay the sales agent a commission of 2.0% ofthe gross sales price per share sold and have agreed to provide the sales agent with customary indemnification and contribution rights.Since entering into the Agreement through February 13, 2018, we have sold 787,547 shares of our common stock resulting in net proceeds of approximately$18.6 million. No shares were sold in the fourth quarter of 2017. Approximately $81.0 million remain available for sale under the program.Our Credit Agreement and Senior Subordinated NotesCredit Agreement. On April 8, 2016, we amended our Senior Credit Agreement (credit agreement) scheduled to mature on April 10, 2020. The amount wecan borrow is the lesser of the amount we elect (from time to time) as the commitment amount or the value of the borrowing base as determined by the lenders, butin either event not to exceed the maximum credit agreement amount of $875.0 million . Our elected commitment amount is $475.0 million . Our borrowing base is$475.0 million . We are charged a commitment fee of 0.50% on the amount available but not borrowed. The fee varies based on the amount borrowed as apercentage of the total borrowing base. We paid $1.0 million in origination, agency, syndication, and other related fees. We are amortizing these fees over the lifeof the credit agreement. With the new amendment, we pledged the following collateral: (a) 85% of the proved developed producing (discounted as present worth at8%) total value of our oil and gas properties and (b) 100% of our ownership interest in our mid-stream affiliate, Superior Pipeline Company, L.L.C.The lenders under our credit agreement and their respective participation interests are: LenderParticipationInterestBOK (BOKF, NA, dba Bank of Oklahoma)17%Compass Bank17%BMO Harris Financing, Inc.15%Bank of America, N.A.15%Comerica Bank8%Wells Fargo Bank, N.A.8%Canadian Imperial Bank of Commerce8%Toronto Dominion (New York), LLC8%The Bank of Nova Scotia4% 100%The borrowing base amount–which is subject to redetermination by the lenders on April 1st and October 1st of each year, is based primarily on a percentageof the discounted future value of our oil and natural gas reserves and on our cash flows from our mid-stream segment. The October 2017 redetermination did notresult in any changes. We or the lenders may request a58Table of Contentsonetime special redetermination of the borrowing base between each scheduled redetermination. In addition, we may request a redetermination following thecompletion of an acquisition that meets the requirements in the credit agreement.At our election, any part of the outstanding debt under the credit agreement may be fixed at a London Interbank Offered Rate (LIBOR). LIBOR interest iscomputed as the sum of the LIBOR base for the applicable term plus 2.00% to 3.00% depending on the level of debt as a percentage of the borrowing base and ispayable at the end of each term, or every 90 days , whichever is less. Borrowings not under LIBOR bear interest at the prime rate specified in the credit agreementthat cannot be less than LIBOR plus 1.00% plus a margin . Interest is payable at the end of each month and the principal may be repaid in whole or in part at anytime, without a premium or penalty. At December 31, 2017 and February 13, 2018 , we had $178.0 million and $173.8 million , respectively, outstandingborrowings under our credit agreement.We can use borrowings for financing general working capital requirements for (a) exploration, development, production and acquisition of oil and gasproperties, (b) acquisitions and operation of mid-stream assets, (c) issuance of standby letters of credit, (d) contract drilling services, and (e) general corporatepurposes.The credit agreement prohibits, among other things:•the payment of dividends (other than stock dividends) during any fiscal year over 30% of our consolidated net income for the preceding fiscal year;•the incurrence of additional debt with certain limited exceptions; and•the creation or existence of mortgages or liens, other than those in the ordinary course of business, on any of our properties, except for our lenders.The credit agreement also requires that we have at the end of each quarter:•a current ratio (as defined in the credit agreement) of not less than 1 to 1 .Through the quarter ending March 31, 2019, the credit agreement also requires that we have at the end of each quarter:•a senior indebtedness ratio of senior indebtedness to consolidated EBITDA (as defined in the credit agreement) for the most recently ended rolling fourquarters of no greater than 2.75 to 1.Beginning with the quarter ending June 30, 2019, and for each quarter ending thereafter, the credit agreement requires:•a leverage ratio of funded debt to consolidated EBITDA (as defined in the credit agreement) for the most recently ended rolling four fiscal quarters of nogreater than 4 to 1 .As of December 31, 2017 , we were in compliance with the covenants in the credit agreement.6.625% Senior Subordinated Notes. We have an aggregate principal amount of $650.0 million , 6.625% senior subordinated notes (the Notes). Interest on theNotes is payable semi-annually (in arrears) on May 15 and November 15 of each year. The Notes will mature on May 15, 2021 . In issuing the Notes, we incurred$14.7 million of fees that are being amortized as debt issuance cost over the life of the Notes.The Notes are subject to an Indenture dated as of May 18, 2011, between us and Wilmington Trust, National Association (successor to Wilmington TrustFSB), as Trustee (the Trustee), as supplemented by the First Supplemental Indenture dated as of May 18, 2011, between us, the Guarantors, and the Trustee, and asfurther supplemented by the Second Supplemental Indenture dated as of January 7, 2013, between us, the Guarantors and the Trustee (as supplemented, the 2011Indenture), establishing the terms and providing for issuing the Notes. The Guarantors are our direct and indirect subsidiaries. The discussion of the Notes in thisreport is qualified by and subject to the actual terms of the 2011 Indenture.Unit, as the parent company, has no independent assets or operations. The guarantees by the Guarantors of the Notes (registered under registrationstatements) are full and unconditional, joint and several, subject to certain automatic customary releases, are subject to certain restrictions on the sale, disposition,or transfer of the capital stock or substantially all of the assets of a subsidiary guarantor, and other conditions and terms set out in the Indenture. Any of oursubsidiaries that are not Guarantors are minor. There are no significant restrictions on our ability to receive funds from our subsidiaries through dividends, loans,advances or otherwise.59Table of ContentsWe may redeem all or, from time to time, a part of the Notes at certain redemption prices, plus accrued and unpaid interest. If a “change of control” occurs,subject to certain conditions, we must offer to repurchase from each holder all or any part of that holder’s Notes at a purchase price in cash equal to 101% of theprincipal amount of the Notes plus accrued and unpaid interest, if any, to the date of purchase. The 2011 Indenture contains customary events of default. The 2011Indenture also contains covenants that, among other things, limit our ability and the ability of certain of our subsidiaries to incur or guarantee additionalindebtedness; pay dividends on our capital stock or redeem capital stock or subordinated indebtedness; transfer or sell assets; make investments; incur liens; enterinto transactions with our affiliates; and merge or consolidate with other companies. We were in compliance with all covenants of the Notes as of December 31,2017 .Capital RequirementsOil and Natural Gas Dispositions, Acquisitions, and Capital Expenditures. Most of our capital expenditures for this segment are discretionary and directedtoward growth. Any decision to increase our oil, NGLs, and natural gas reserves through acquisitions or through drilling depends on the prevailing or expectedmarket conditions, potential return on investment, future drilling potential, and opportunities to obtain financing, which provide us flexibility in deciding when andif to incur these costs. We completed drilling 70 gross wells ( 25.71 net wells) in 2017 compared to 21 gross wells ( 9.67 net wells) in 2016 , and 58 gross wells (34.99 net wells) in 2015 .On April 3, 2017, we closed an acquisition of certain oil and natural gas assets located primarily in Grady and Caddo Counties in western Oklahoma. Thefinal adjusted value of consideration given was $54.3 million. As of January 1, 2017, the effective date of the acquisition, the estimated proved oil and gas reservesof the acquired properties were 3.2 million barrels of oil equivalent (MMBoe). The acquisition added approximately 8,300 net oil and gas leasehold acres to ourcore Hoxbar area in southwestern Oklahoma including approximately 47 proved developed producing wells. This acquisition included 13 potential horizontaldrilling locations not otherwise included in our existing acreage. Of the acreage acquired, approximately 71% was held by production. We also received onegathering system as part of the transaction.Capital expenditures for oil and gas properties on the full cost method for 2017 by this segment, excluding a $4.0 million reduction in the ARO liability and$59.0 million in acquisitions (including associated ARO), totaled $215.4 million compared to 2016 capital expenditures of $119.9 million (excluding a $30.9million reduction in the ARO liability and $0.6 million in acquisitions), and 2015 capital expenditures of $273.5 million (excluding an $5.7 million reduction in theARO liability and $0.2 million in acquisitions).For 2018, we plan to participate in drilling approximately 75 to 85 gross wells and estimate our total capital expenditures (excluding any possibleacquisitions) for our oil and natural gas segment will be approximately $272.0 million . Whether we drill all of those wells depends on several factors, many ofwhich are beyond our control and include the availability of drilling rigs, availability of pressure pumping services, prices for oil, NGLs, and natural gas, demandfor oil, NGLs, and natural gas, the cost to drill wells, the weather, and the efforts of outside industry partners.We sold non-core oil and natural gas assets, net of related expenses, for $18.6 million , $67.2 million , and $1.9 million during 2017 , 2016 , and 2015 ,respectively. Proceeds from those dispositions reduced the net book value of our full cost pool with no gain or loss recognized.Contract Drilling Dispositions, Acquisitions, and Capital Expenditures. During 2015, we recorded a write-down on 31 of our drilling rigs and relatedequipment of approximately $8.3 million pre-tax based on the estimated market value for similar equipment from auctions sales. We then sold all 31 of thesedrilling rigs and some other drilling equipment to unaffiliated third parties. The proceeds from the sale of those assets, less costs to sell, was less than the $11.3million net book value resulting in a loss of $7.3 million pre-tax.During 2015, five BOSS drilling rigs were constructed and placed into service for third-party operators.During December 2016, we sold an idle 1500 HP SCR drilling rig to an unaffiliated third party. We also fabricated and placed into service our ninth newBOSS drilling rig for a third party operator. This new BOSS rig was constructed using the long lead time components purchased in prior years.During 2017, we built our tenth BOSS drilling rig and placed it into service for a third party operator under a long term contract. We also returned to service14 SCR drilling rigs that had been previously stacked.Our anticipated 2018 capital expenditures for this segment is approximately $47.0 million . We spent $36.1 million for capital expenditures during 2017compared to $19.1 million in 2016 , and $84.8 million in 2015 .60Table of ContentsMid-Stream Dispositions, Acquisitions, and Capital Expenditures . At our Cashion processing facility in central Oklahoma, our total throughput volume forthe fourth quarter of 2017 averaged approximately 37.3 MMcf per day and our total production of natural gas liquids increased to approximately 198,600 gallonsper day. The total processing capacity at this facility is approximately 45 MMcf per day. During 2017, we connected 12 new wells to this system from threeproducers. We are continuing a pipeline extension project for a producer scheduled to actively drill in the Cashion area in 2018. We have already connected fournew wells from this producer and anticipate connecting several more wells throughout 2018. As volume increases on this system, we will evaluate the need to addadditional processing capacity. If volume continues to increase, we may need to add an additional processing plant in the Cashion area.At our Hemphill processing facility in the Texas panhandle, our average gathered volume for the fourth quarter of 2017 was approximately 68.5 MMcf perday and our total production of natural gas liquids increased to 188,600 gallons per day. During 2017, we connected six new wells to this processing system withseveral more wells scheduled to be connected in the first part of 2018. We have completed construction of the pipeline to connect the next well pad and we areupgrading our compression facilities to handles the expected additional volume.At our Bellmon processing facility in the Mississippian play in north central Oklahoma, during 2017 we connected 14 new wells to this system. Our totalthroughput volume for the fourth quarter of 2017 averaged approximately 27 MMcf per day. We have two processing skids available that provide total processingcapacity of 90 MMcf per day. At our Segno gathering facility in Southeast Texas, our average gathered volume for the fourth quarter of 2017 was approximately 86.4 MMcf per day. Thegathering and dehydration capacity for this facility is approximately 120 MMcf per day. During 2017, we connected three new wells to this gathering system alongwith additional volume from recompletion activity in the area around our system.In the Appalachian region, at our Pittsburgh Mills gathering system, we continue to connect new well pads to this system. During 2017, we connected onenew well pad with five new wells to this gathering system. By adding these new wells our average gathered volume for the fourth quarter was approximately 117.2MMcf per day. We are constructing a new pipeline to connect the next well pad to this system. Most of the preliminary environmental and permitting activitieshave been completed and right of way has been obtained. In the first quarter of 2018, we will start the construction of the pipeline with an expected completiondate in the third quarter of 2018. This new well pad is expected to have seven wells drilled and we anticipate receiving gas from this pad at the end of 2018. Thiswell pad is on the south end of our system and will be connected to our Kissick compressor station. And we have been notified by the producer they will drill seveninfill wells on already existing pads in 2018.During 2017 , our mid-stream segment incurred $22.2 million in capital expenditures as compared to $16.8 million in 2016 , and $63.5 million , in 2015 . For2018 , our estimated capital expenditures is approximately $32.0 million .61Table of ContentsContractual CommitmentsAt December 31, 2017 , we had these contractual obligations: Payments Due by Period Total Less Than1 Year 2-3Years 4-5Years After5 Years (In thousands)Long-term debt (1)$986,931 $49,133 $271,871 $665,927 $—Operating leases (2)3,878 2,717 1,024 137 —Capital lease interest and maintenance (3)7,048 2,324 4,172 552 —Drill pipe, drilling components, and equipmentpurchases (4)3,887 3,887 — — —Total contractual obligations$1,001,744 $58,061 $277,067 $666,616 $—_________________________ (1)See previous discussion in MD&A regarding our long-term debt. This obligation is presented under the Notes and credit agreement and includes interest calculated using our December 31,2017 interest rates of 6.625% for the Notes and 3.4% for the credit agreement.(2)We lease office space or yards in Edmond and Oklahoma City, Oklahoma; Houston, Texas; Englewood, Colorado; Pinedale, Wyoming; and Canonsburg, Pennsylvania under the terms ofoperating leases expiring through December 2021. And, we have several equipment leases and lease space on short-term commitments to stack excess drilling rig equipment andproduction inventory.(3)Maintenance and interest payments are included in our capital lease agreements. The capital leases are discounted using annual rates of 4.0%. Total maintenance and interest remaining are$5.9 million and $1.2 million , respectively.(4)We have committed to purchase approximately $3.9 million of new drilling rig components over the next year.62Table of ContentsAt December 31, 2017 , we also had these commitments and contingencies that could create, increase or accelerate our liabilities: Estimated Amount of Commitment Expiration Per PeriodOther CommitmentsTotalAccrued LessThan 1Year 2-3Years 4-5Years After 5Years (In thousands)Deferred compensation plan (1)$5,390 Unknown Unknown Unknown UnknownSeparation benefit plans (2)$6,524 $657 Unknown Unknown UnknownARO liability (3)$69,444 $1,726 $42,409 $3,908 $21,401Gas balancing liability (4)$3,283 Unknown Unknown Unknown UnknownRepurchase obligations (5)$— Unknown Unknown Unknown UnknownWorkers’ compensation liability (6)$13,340 $6,775 $1,712 $917 $3,936Capital lease obligations (7)$15,224 $3,844 $8,164 $3,216 $—Derivative liabilities—commodity hedges$7,763 $7,763 $— $— $—_________________________ (1)We provide a salary deferral plan which allows participants to defer the recognition of salary for income tax purposes until actual distribution of benefits, which occurs at either terminationof employment, death or certain defined unforeseeable emergency hardships. We recognize payroll expense and record a liability, included in other long-term liabilities in our ConsolidatedBalance Sheets, at the time of deferral.(2)Effective January 1, 1997, we adopted a separation benefit plan (Separation Plan). The Separation Plan allows eligible employees whose employment with us is involuntarily terminated orwith an employee who has completed 20 years of service, voluntarily or involuntarily terminated, to receive benefits equivalent to four weeks salary for every whole year of servicecompleted with the company up to a maximum of 104 weeks. To receive payments the recipient must waive certain claims against us in exchange for receiving the separation benefits. OnOctober 28, 1997, we adopted a Separation Benefit Plan for Senior Management (Senior Plan). The Senior Plan provides certain officers and key executives of the company with benefitsgenerally equivalent to the Separation Plan. The Compensation Committee of the Board of Directors has absolute discretion in the selection of the individuals covered in this plan. OnMay 5, 2004 we also adopted the Special Separation Benefit Plan (Special Plan). This plan is identical to the Separation Benefit Plan with the exception that the benefits under the plan veston the earliest of a participant’s reaching the age of 65 or serving 20 years with the company.(3)When a well is drilled or acquired, under ASC 410 “Accounting for Asset Retirement Obligations,” we record the fair value of liabilities associated with the retirement of long-lived assets(mainly plugging and abandonment costs for our depleted wells).(4)We have recorded a liability for those properties we believe do not have sufficient oil, NGLs, and natural gas reserves to allow the under-produced owners to recover their under-production from future production volumes.(5)We formed The Unit 1984 Oil and Gas Limited Partnership and the 1986 Energy Income Limited Partnership along with private limited partnerships (the Partnerships) with certainqualified employees, officers and directors from 1984 through 2011. One of our subsidiaries serves as the general partner of each of these programs. Effective December 31, 2014, the 1984partnership was dissolved and effective December 31, 2016, the two 1986 partnerships were also dissolved. The Partnerships were formed to conduct oil and natural gas acquisition,drilling and development operations and serving as co-general partner with us in any additional limited partnerships formed during that year. The Partnerships participated on aproportionate basis with us in most drilling operations and most producing property acquisitions commenced by us for our own account during the period from the formation of thePartnership through December 31 of that year. These partnership agreements require, on the election of a limited partner, that we repurchase the limited partner’s interest at amounts to bedetermined by appraisal in the future. Repurchases in any one year are limited to 20% of the units outstanding. We made repurchases of approximately $2,900 , $5,000, and $118,000 in2017, 2016, and 2015, respectively.(6)We have recorded a liability for future estimated payments related to workers’ compensation claims primarily associated with our contract drilling segment.(7)This amount includes commitments under capital lease arrangements for compressors in our mid-stream segment.Derivative ActivitiesPeriodically we enter into derivative transactions locking in the prices to be received for a portion of our oil, NGLs, and natural gas production. Any changein the fair value of all our derivatives are reflected in the statement of operations.63Table of ContentsCommodity Derivatives . Our commodity derivatives should reduce our exposure to price volatility and manage price risks. Our decision on the type andquantity of our production and the price(s) of our derivative(s) is based, in part, on our view of current and future market conditions. As of December 31, 2017 ,based on our fourth quarter 2017 average daily production, the approximated percentages of our production under derivative contracts are as follows: Mark-to-Market 2018 Q1 Q2 Q3 Q4Daily oil production70% 63% 63% 63%Daily natural gas production53% 33% 33% 29%Daily NGLs production—% 7% 7% —%Regarding the commodities subject to derivative contracts, those contracts limit the risk of adverse downward price movements. However, they also limitincreases in future revenues that would otherwise result from price movements above the contracted prices.Using derivative transactions has the risk that the counterparties may not meet their financial obligations under the transactions. Based on our evaluation atDecember 31, 2017 , we believe the risk of non-performance by our counterparties is not material. At December 31, 2017 , the fair values of the net assets(liabilities) we had with each of the counterparties to our commodity derivative transactions are: December 31, 2017 (In millions)Canadian Imperial Bank of Commerce$0.7Bank of America Merrill Lynch(2.5)Bank of Montreal(5.3)Total assets (liabilities)$(7.1)If a legal right of set-off exists, we net the value of the derivative arrangements we have with the same counterparty in our Consolidated Balance Sheets. AtDecember 31, 2017 , we recorded the fair value of our commodity derivatives on our balance sheet as current derivative assets of $0.7 million and currentderivative liabilities of $7.8 million . At December 31, 2016, we recorded the fair value of our commodity derivatives on our balance sheet as non-currentderivative assets of $0.4 million and current and non-current derivative liabilities of $21.6 million and $0.4 million, respectively. All derivatives are recognized on the balance sheet and measured at fair value. Any changes in our derivatives' fair value before their maturity (i.e.,temporary fluctuations in value) are reported in gain (loss) on derivatives in our Consolidated Statements of Operations. These gains (losses) are as follows at December 31: 2017 2016 2015 (In thousands)Gain (loss) on derivatives, included are amounts settled during the period of $173, $9,658, and$46,615, respectively$14,732 $(22,813) $26,345Stock and Incentive CompensationDuring 2017 , we granted awards covering 708,276 shares of restricted stock. These awards were granted as retention incentive awards. These stock awardshad an estimated fair value as of the grant date of $17.4 million . Compensation expense will be recognized over the awards' three year vesting period. During 2017, we recognized $7.0 million in additional compensation expense and capitalized $1.1 million for these awards. During 2016 , we granted awards covering 736,451shares of restricted stock. These awards were granted as retention incentive awards and are being recognized over the awards' three year vesting period. During2015 , we granted awards covering 750,290 shares of restricted stock. These awards were granted as retention incentive awards and are being recognized over theirtwo and three year vesting periods. No SAR awards were made during 2017 , 2016 , or 2015 .64Table of ContentsDuring 2017 , we recognized compensation expense of $13.3 million for our restricted stock grants and capitalized $1.8 million of compensation cost for oiland natural gas properties.InsuranceWe are self-insured for certain losses relating to workers’ compensation, general liability, control of well, and employee medical benefits. Insured policiesfor other coverage contain deductibles or retentions per occurrence that range from zero to $1.0 million. We have purchased stop-loss coverage to limit, to theextent feasible, per occurrence and aggregate exposure to certain types of claims. There is no assurance that the insurance coverage we have will protect us againstliability from all potential consequences. If insurance coverage becomes more expensive, we may choose to self-insure, decrease our limits, raise our deductibles,or any combination of these rather than pay higher premiums.Oil and Natural Gas Limited Partnerships and Other Entity Relationships.We are the general partner of 13 oil and natural gas partnerships formed privately or publicly. Each partnership’s revenues and costs are shared underformulas set out in that partnership’s agreement. The partnerships repay us for contract drilling, well supervision and general and administrative expense. Relatedparty transactions for contract drilling and well supervision fees are the related party’s share of such costs. These costs are billed the same as billings to unrelatedthird parties for similar services. General and administrative reimbursements consist of direct general and administrative expense incurred on the related party’sbehalf and indirect expenses assigned to the related parties. Allocations are based on the related party’s level of activity and are considered by us to be reasonable.During 2017 , 2016 , and 2015 , the total we received for these fees was $0.2 million , $0.3 million , and $0.4 million , respectively. Our proportionate share ofassets, liabilities, and net income relating to the oil and natural gas partnerships is included in our consolidated financial statements.Effects of InflationThe effect of inflation in the oil and natural gas industry is primarily driven by the prices for oil, NGLs, and natural gas. Increases in these prices increase thedemand for our contract drilling rigs and services. This increase in demand affects the dayrates we can obtain for our contract drilling services. During periods ofhigher demand for our drilling rigs we have experienced increases in labor costs and the costs of services to support our drilling rigs. Historically, during this sameperiod, when oil, NGLs, and natural gas prices declined, labor rates did not come back down to the levels existing before the increases. If commodity pricesincrease substantially for a long period, shortages in support equipment (like drill pipe, third party services, and qualified labor) can cause additional increases inour material and labor costs. Increases in dayrates for drilling rigs also increase the cost of our oil and natural gas properties. Commodity prices also can affect ourfracking and completion costs. How inflation will affect us in the future will depend on increases, if any, realized in our drilling rig rates, the prices we receive forour oil, NGLs, and natural gas, and the rates we receive for gathering and processing natural gas. Due to increased demand for drilling rigs and the need tomaintain qualified labor, we increased pay for some of our drilling personnel in the fourth quarter of 2017 and again in the first quarter of 2018.Off-Balance Sheet ArrangementsWe do not currently utilize any off-balance sheet arrangements with unconsolidated entities to enhance liquidity and capital resource positions, or for anyother purpose. However, as is customary in the oil and gas industry, we are subject to various contractual commitments.65Table of ContentsResults of Operations2017 versus 2016 2017 2016 PercentChange (1) (In thousands unless otherwise specified) Total operating revenue$739,640 $602,177 23 %Net income (loss)$117,848 $(135,624) 187 % Oil and Natural Gas: Revenue$357,744 $294,221 22 %Operating costs excluding depreciation, depletion, amortization, and impairment$130,789 $120,184 9 %Depreciation, depletion, and amortization$101,911 $113,811 (10)%Impairment of oil and gas properties$— $161,563 (100)% Average oil price received (Bbl)$49.44 $40.50 22 %Average NGL price received (Bbl)$18.35 $11.26 63 %Average natural gas price received (Mcf)$2.46 $2.07 19 %Oil production (MBbls)2,715 2,974 (9)%NGLs production (MBbls)4,737 5,014 (6)%Natural gas production (MMcf)51,260 55,735 (8)%Depreciation, depletion, and amortization rate (Boe)$6.00 $6.24 (4)% Contract Drilling: Revenue$174,720 $122,086 43 %Operating costs excluding depreciation$122,600 $88,154 39 %Depreciation$56,370 $46,992 20 % Percentage of revenue from daywork contracts100% 100% — %Average number of drilling rigs in use30.0 17.4 72 %Average dayrate on daywork contracts$16,256 $17,784 (9)% Mid-Stream: Revenue$207,176 $185,870 11 %Operating costs excluding depreciation and amortization$155,483 $137,609 13 %Depreciation and amortization$43,499 $45,715 (5)% Gas gathered—Mcf/day385,209 419,217 (8)%Gas processed—Mcf/day137,625 155,461 (11)%Gas liquids sold—gallons/day534,140 536,494 — % Corporate and other: General and administrative expense$38,087 $33,337 14 %Other depreciation$7,477 $1,835 NMGain on disposition of assets$327 $2,540 (87)%Other income (expense): Interest expense, net$(38,334) $(39,829) (4)%Gain (loss) on derivatives$14,732 $(22,813) 165 %Other$21 $307 (93)%Income tax benefit$(57,678) $(71,194) 19 %Average interest rate6.0% 5.7% 5 %Average long-term debt outstanding$810,734 $868,332 (7)%_________________________(1)NM – A percentage calculation is not meaningful due to a zero-value denominator or a percentage change greater than 200.66Table of ContentsOil and Natural GasOil and natural gas revenues increase d $63.5 million or 22% in 2017 as compared to 2016 due primarily to higher commodity prices partially offset by adecrease in production. Oil production decrease d 9% , NGLs production decrease d 6% , and natural gas production decrease d 8% . Average oil prices betweenthe comparative years increase d 22% to $49.44 per barrel, NGLs prices increase d 63% to $18.35 per barrel, and natural gas prices increased 19% to $2.46 perMcf.Oil and natural gas operating costs increase d $10.6 million or 9% between the comparative years of 2017 and 2016 primarily due to higher LOE and grossproduction taxes partially offset by lower saltwater disposal expense.DD&A decrease d $11.9 million or 10% primarily due to a 4% decrease in our DD&A rate and by the effect of a 7% decrease in equivalent production. Thedecrease in our DD&A rate in 2017 compared to 2016 resulted primarily from the effect of the ceiling test write-downs throughout 2016. Our DD&A expense onour oil and natural properties is calculated each quarter using period end reserve quantities adjusted for period production.During 2016, we recorded non-cash ceiling test write-downs of our oil and natural gas properties totaling $161.6 million pre-tax ( $100.6 million net of tax).We did not have a non-cash ceiling test write-down in 2017. The write-downs were due primarily from the reduction of the 12-month average commodity pricesduring 2016.Contract DrillingDrilling revenues increase d $52.6 million or 43% in 2017 as compared to 2016 . The increase was due primarily to a 72% increase in the average number ofdrilling rigs in use partially offset by a 9% decrease in the average dayrate compared to 2016. Average drilling rig utilization increased from 17.4 drilling rigs in2016 to 30.0 drilling rigs in 2017 .Drilling operating costs increase d $34.4 million or 39% in 2017 compared to 2016 . The increase was due primarily to more drilling rigs operating. Contractdrilling depreciation increase d $9.4 million or 20% also due primarily to more drilling rigs operating.Mid-StreamOur mid-stream revenues increase d $21.3 million or 11% in 2017 as compared to 2016 primarily due to increased NGLs and condensate sales. Gasprocessing volumes per day decrease d 11% between the comparative years primarily due to fewer new well connections to our processing systems. Gas gatheringvolumes per day decrease d 8% primarily due to declining volumes in the Appalachian region.Operating costs increase d $17.9 million or 13% in 2017 compared to 2016 primarily due to increased natural gas, NGLs, and condensate prices.Depreciation and amortization decrease d $2.2 million or 5% primarily due to less capital expenditures this year while older assets became fully depreciated.General and AdministrativeGeneral and administrative expenses increase d $4.8 million or 14% in 2017 compared to 2016 primarily due to higher employee costs.Other DepreciationOther depreciation increase d $5.6 million in 2017 compared to 2016 primarily due to the depreciation on the new ERP system and the corporate officefacility.Gain on Disposition of AssetsGain on disposition of assets decreased $2.2 million in 2017 compared to 2016. The gain in 2017 was primarily for the sale of a corporate aircraft andvehicles, while the pre-tax gain of $3.2 million in 2016 was primarily for the sale of one drilling rig, various drilling rig components, vehicles, and other equipmentsomewhat offset by losses from our oil and natural gas and mid-stream segments in 2016.67Table of ContentsOther Income (Expense)Interest expense, net of capitalized interest, decrease d $1.5 million between the comparative years of 2017 and 2016 . We capitalized interest based on thenet book value associated with unproved properties not being amortized, the construction of additional drilling rigs, and the construction of gas gathering systems.Capitalized interest for 2017 was $15.9 million compared to $15.3 million in 2016, and was netted against our gross interest of $54.2 million and $55.1 million for2017 and 2016, respectively. Our average interest rate increase d from 5.7% to 6.0% and our average debt outstanding was $57.6 million lower in 2017 ascompared to 2016 primarily due to the decrease in our outstanding borrowings under our credit agreement over the comparative periods.Gain (loss) on derivatives increased from a loss of $22.8 million in 2016 to a gain of $14.7 million in 2017 primarily due to fluctuations in forward pricesused to estimate the fair value in mark-to-market accounting.Income Tax BenefitIncome tax benefit decreased $13.5 million in 2017 compared to 2016 primarily. During the fourth quarter of 2017, the U.S. government enacted the TaxCuts and Jobs Act (the Tax Act). Among other provisions, the Tax Act reduces the federal corporate tax rate from the existing maximum rate of 35% to 21%,effective January 1, 2018. As a result of the Tax Act, the Company recorded a tax benefit of $81.3 million due to a revaluation of our net deferred taxliability. Without this income tax benefit charge, income tax expense would have been $23.6 million in 2017 compared to an income tax benefit of $71.2 million in2016 or an increase of $94.8 million which is commensurate with the increase in pre-tax income for 2017 compared to 2016.Our effective tax rate was (95.9%) for 2017 compared to 34.4% for 2016. The effective tax rate for the current year was dramatically lower due to the TaxAct and revaluation of our net deferred tax liability. Without the $81.3 million income tax benefit, our effective tax rate for 2017 would have been 39.3% The ratechange without consideration of deferred tax liability revaluation was primarily due to increased deferred income tax expense related to our restricted stockvestings in both years whereby the increase in 2017 increased our deferred income tax expense and the increase in 2016 decreased our income tax benefit. We didnot pay any income taxes during 2017. 68Table of Contents2016 versus 2015 2016 2015 PercentChange (1) (In thousands unless otherwise specified) Total operating revenue$602,177 $854,231 (30)%Net loss$(135,624) $(1,037,361) 87 % Oil and Natural Gas: Revenue$294,221 $385,774 (24)%Operating costs excluding depreciation, depletion, amortization, and impairment$120,184 $166,046 (28)%Depreciation, depletion, and amortization$113,811 $251,944 (55)%Impairment of oil and natural gas properties$161,563 $1,599,348 (90)% Average oil price received (Bbl)$40.50 $50.79 (20)%Average NGLs price received (Bbl)$11.26 $10.12 11 %Average natural gas price received (Mcf)$2.07 $2.63 (21)%Oil production (MBbls)2,974 3,783 (21)%NGLs production (MBbls)5,014 5,274 (5)%Natural gas production (MMcf)55,735 65,546 (15)%Depreciation, depletion, and amortization rate (Boe)$6.24 $12.30 (49)% Contract Drilling: Revenue$122,086 $265,668 (54)%Operating costs excluding depreciation and impairment$88,154 $156,408 (44)%Depreciation$46,992 $56,135 (16)%Impairment of contract drilling equipment$— $8,314 (100)% Percentage of revenue from daywork contracts100% 100% — %Average number of drilling rigs in use17.4 34.7 (50)%Average dayrate on daywork contracts$17,784 $19,455 (9)% Mid-Stream: Revenue$185,870 $202,789 (8)%Operating costs excluding depreciation, amortization, and impairment$137,609 $161,556 (15)%Depreciation and amortization$45,715 $43,676 5 %Impairment of gas gathering and processing systems$— $26,966 (100)% Gas gathered—Mcf/day419,217 353,771 18 %Gas processed—Mcf/day155,461 182,684 (15)%Gas liquids sold—gallons/day536,494 577,513 (7)% Corporate and other: General and administrative expense$33,337 $34,358 (3)%Other depreciation$1,835 $987 86 %Gain (loss) on disposition of assets$2,540 $(7,229) 135 %Other income (expense): Interest expense, net$(39,829) $(31,963) 25 %Gain (loss) on derivatives$(22,813) $26,345 (187)%Other$307 $45 NMIncome tax benefit$(71,194) $(626,948) 89 %Average interest rate5.7% 5.4% 6 %Average long-term debt outstanding$868,332 $897,391 (3)%_________________________(1)NM – A percentage calculation is not meaningful due to a zero-value denominator or a percentage change greater than 200.69Table of ContentsOil and Natural GasOil and natural gas revenues decreased $91.6 million or 24% in 2016 as compared to 2015 due primarily to lower oil and natural gas prices and a decrease inproduction. Oil production decreased 21%, NGLs production decreased 5%, and natural gas production decreased 15%. Average oil prices between thecomparative years decreased 20% to $40.50 per barrel, NGLs prices increased 11% to $11.26 per barrel, and natural gas prices decreased 21% to $2.07 per Mcf.Oil and natural gas operating costs decreased $45.9 million or 28% between the comparative years of 2016 and 2015 due to lower LOE, saltwater disposal,and general and administrative expense.DD&A decreased $138.1 million or 55% primarily due to a 49% decrease in our DD&A rate and by the effect of a 14% decrease in equivalent production.The decrease in our DD&A rate in 2016 compared to 2015 resulted primarily from the effect of the ceiling test write-downs during 2015 and 2016. Our DD&Aexpense on our oil and natural properties is calculated each quarter using period end reserve quantities adjusted for period production.During 2016, we recorded non-cash ceiling test write-downs of our oil and natural gas properties totaling $161.6 million pre-tax ($100.6 million, net of tax)compared to a non-cash ceiling test write-down of our oil and natural gas properties of $1.6 billion pre-tax ($1.0 billion net of tax) in 2015. These write-downswere due primarily from the reduction of the 12-month average commodity prices during each year.Contract DrillingDrilling revenues decreased $143.6 million or 54% in 2016 as compared to 2015. The decrease was due primarily to a 50% decrease in the average numberof drilling rigs in use, a 9% decrease in the average dayrate, and $25.9 million less received for fees on contracts terminated early in 2016 compared to 2015.Average drilling rig utilization decreased from 34.7 drilling rigs in 2015 to 17.4 drilling rigs in 2016.Drilling operating costs decreased $68.3 million or 44% in 2016 compared to 2015. The decrease was due primarily to fewer drilling rigs operating. Contractdrilling depreciation decreased $9.1 million or 16% also due primarily to fewer drilling rigs operating. During the second quarter of 2015, we recorded animpairment of approximately $8.3 million on 31 drilling rigs and other equipment sold at auction during the third quarter.Mid-StreamOur mid-stream revenues decreased $16.9 million or 8% in 2016 as compared to 2015 due primarily to gas sold per day decreasing 16% and NGLs sold perday decreasing 7%. Gas processing volumes per day decreased 15% between the comparative years primarily from fewer well connections near our processingsystems. Gas gathering volumes per day increased 18% primarily from new well connections in the Appalachian region.Operating costs decreased $23.9 million or 15% in 2016 compared to 2015 primarily due to a 6% decrease in prices paid for natural gas purchased and a 15%decrease in purchase volumes. Depreciation and amortization increased $2.0 million or 5% primarily due to capital expenditures for upgrades and well connects.In December 2015, our mid-stream segment had a $27.0 million pre-tax write-down of three of its systems, Bruceton Mills, Midwell, and Spring Creek dueto anticipated future cash flow and future development around these systems not being sufficient to support their carrying value. The estimated future cash flowswere less than the carrying value on these systems.Due to continued depressed NGLs prices, we were operating most of our processing facilities in full ethane rejection mode which reduced the liquids soldthroughout 2016. Our mid-stream segment also experienced a reduction in processed volumes in 2016 due to the low pricing environment and reduced drillingactivity around our systems.General and AdministrativeGeneral and administrative expenses decreased $1.0 million or 3% in 2016 compared to 2015 primarily due to lower employee costs.70Table of ContentsOther DepreciationOther depreciation increased $0.8 million or 86% in 2016 compared to 2015 primarily due to the depreciation on the corporate office facility.Gain (loss) on Disposition of AssetsGain (loss) on disposition of assets increased $9.8 million in 2016 compared to 2015 primarily due to the gain of $3.2 million pre-tax on the sale of onedrilling rig, various drilling rig components, vehicles, and other equipment somewhat offset by losses from our oil and natural gas and mid-stream segments,compared to a loss of $7.3 million pre-tax on the sale of 31 drilling rigs and other drilling equipment somewhat offset by the gains on the sale of one gatheringsystem, various drilling rig components, vehicles, and a drilling rig during 2015.Other Income (Expense)Interest expense, net of capitalized interest, increased $7.9 million between the comparative years of 2016 and 2015. We capitalized interest based on the netbook value associated with unproved properties not being amortized, the construction of additional drilling rigs, and the construction of gas gathering systems.Capitalized interest for 2016 was $15.3 million compared to $21.7 million in 2015, and was netted against our gross interest of $55.1 million and $53.7 million for2016 and 2015, respectively. Our average interest rate increased from 5.4% to 5.7% and our average debt outstanding was $29.1 million lower in 2016 ascompared to 2015 primarily due to the decrease in our outstanding borrowings under our credit agreement over the comparative periods.Gain (loss) on derivatives decreased from a gain of $26.3 million in 2015 to a loss of $22.8 million in 2016 primarily due to fluctuations in forward pricesused to estimate the fair value in mark-to-market accounting.Income Tax BenefitIncome tax benefit decreased $555.8 million in 2016 compared to 2015 primarily due to a lower pre-tax loss from a reduction in non-cash ceiling test write-downs in 2016 compared to 2015. Our effective tax rate was 34.4% for 2016 and 37.7% for 2015. This decrease was primarily due to increased deferred taxexpense in 2016 related to our restricted stock vestings in 2016 after the exhaustion of our remaining accumulated excess tax benefits. The current income taxbenefit was minimal in 2016 compared to a current income tax benefit of $20.6 million for 2015. The $20.6 million current income tax benefit in 2015 wasprimarily due to an anticipated alternative minimum tax (AMT) net operating loss (NOL) carryback refund claim. We paid $42,000 in income taxes during 2016.Item 7A. Quantitative and Qualitative Disclosures about Market RiskOur operations are exposed to market risks primarily because of changes in the prices for natural gas and oil and interest rates.Commodity Price Risk. Our major market risk exposure is in the prices we receive for our oil, NGLs, and natural gas production. Those prices are primarilydriven by the prevailing worldwide price for crude oil and market prices applicable to our natural gas production. Historically, these prices have fluctuated and theywill probably continue to do so. The price of oil, NGLs, and natural gas also affects both the demand for our drilling rigs and the amount we can charge for ourdrilling rigs. Based on our 2017 production, a $0.10 per Mcf change in what we are paid for our natural gas production would cause a corresponding $410,000 permonth ( $4.9 million annualized) change in our pre-tax cash flow. A $1.00 per barrel change in our oil price would have a $217,000 per month ( $2.6 millionannualized) change in our pre-tax operating cash flow and a $1.00 per barrel change in our NGLs prices would have a $380,000 per month ( $4.6 millionannualized) change in our pre-tax cash flow.We use derivative transactions to manage the risk associated with price volatility. Our decision on the type and quantity of our production and the price(s) ofour derivative(s) is based, in part, on our view of current and future market conditions. The transactions we use include financial price swaps under which we willreceive a fixed price for our production and pay a variable market price to the contract counterparty. We do not hold or issue derivative instruments for speculativetrading purposes.71Table of ContentsAt December 31, 2017 , these non-designated hedges were outstanding:Term Commodity Contracted Volume Weighted AverageFixed Price for Swaps Contracted MarketJan’18 – Dec’18 Natural gas – swap 20,000 MMBtu/day $3.013 IF – NYMEX (HH)Apr'18 – Oct'18 Natural gas – swap 10,000 MMBtu/day $2.990 IF – NYMEX (HH)Jan’18 – Mar'18 Natural gas – basis swap 10,000 MMBtu/day $(0.208) IF – NYMEX (HH)Nov’18 – Dec'18 Natural gas – basis swap 10,000 MMBtu/day $(0.208) IF – NYMEX (HH)Jan’18 – Mar'18 Natural gas – three-way collar 60,000 MMBtu/day $3.29 - $2.63 - $4.07 IF – NYMEX (HH)Apr’18 – Dec'18 Natural gas – three-way collar 20,000 MMBtu/day $3.00 - $2.50 - $3.51 IF – NYMEX (HH)Jan’18 – Dec'18 Crude oil – swap 3,000 Bbl/day $51.36 WTI – NYMEXJan’18 – Mar'18 Crude oil – collar 500 Bbl/day $55.00 - $59.50 WTI – NYMEXJan’18 – Dec'18 Crude oil – three-way collar 2,000 Bbl/day $47.50 - $37.50 - $56.08 WTI – NYMEXApr’18 – Sep'18 Liquids (Propane) – swap 1,000 Bbl/day $31.16 MONT BELVIEUAfter December 31, 2017 , these non-designated hedges were entered into: Term Commodity Contracted Volume Weighted Average Fixed Price for Swaps Contracted MarketApr’18 – Sep'18 Natural gas – swap 10,000 MMBtu/day $2.925 IF – NYMEX (HH)Apr’18 – Sep'18 Natural gas – collar 30,000 MMBtu/day $2.67 - $2.97 IF – NYMEX (HH)Feb’18 – Dec'18 Natural gas – basis swap 10,000 MMBtu/day $(0.678) PEPLFeb’18 – Dec'18 Natural gas – basis swap 10,000 MMBtu/day $(0.568) NGPL MIDCONApr’18 – Oct'18 Natural gas – basis swap 10,000 MMBtu/day $(0.190) NGPL TEXOKJan'19 – Dec'19 Natural gas – basis swap 10,000 MMBtu/day $(0.728) PEPLJan'19 – Dec'19 Natural gas – basis swap 10,000 MMBtu/day $(0.625) NGPL MIDCONJan'19 – Dec'19 Natural gas – basis swap 20,000 MMBtu/day $(0.273) NGPL TEXOKJan'20 – Dec'20 Natural gas – basis swap 20,000 MMBtu/day $(0.280) NGPL TEXOKApr'18 – Dec'18 Crude oil – swap 1,000 Bbl/day $60.00 WTI – NYMEXApr’18 – Sep'18 Liquids – swap 500 Bbl/day $34.10 MONT BELVIEUInterest Rate Risk. Our interest rate exposure relates to our long-term debt under our credit agreement and the Notes. The credit agreement, at our electionbears interest at variable rates based on the Prime Rate or the LIBOR Rate. At our election, borrowings under our credit agreement may be fixed at the LIBORRate for periods of up to 180 days. Based on our average outstanding long-term debt subject to a variable rate in 2017, a 1% increase in the floating rate wouldreduce our annual pre-tax cash flow by approximately $1.6 million. Under our Notes, we pay a fixed rate of interest of 6.625% per year (payable semi-annually inarrears on May 15 and November 15 of each year).72Table of ContentsItem 8. Financial Statements and Supplementary DataIndex to Financial StatementsUnit Corporation and Subsidiaries PageManagement’s Report on Internal Control over Financial Reporting74Consolidated Financial Statements: Report of Independent Registered Public Accounting Firm75Consolidated Balance Sheets at December 31, 2017 and 201677Consolidated Statements of Operations for the Years Ended December 31, 2017, 2016, and 201579Consolidated Statements of Comprehensive Income (Loss) for the Years Ended December 31, 2017, 2016, and 201580Consolidated Statements of Changes in Shareholders’ Equity for the Years Ended December 31, 2015, 2016, and 201781Consolidated Statements of Cash Flows for the Years Ended December 31, 2017, 2016, and 201582Notes to Consolidated Financial Statements8373Table of ContentsManagement’s Report on Internal Control over Financial ReportingManagement of the company is responsible for establishing and maintaining adequate internal control over financial reporting. Internal control over financialreporting is defined in Rules 13a-15(f) or 15d-15(f) promulgated under the Securities Exchange Act of 1934 as a process designed by, or under the supervision of,the company’s principal executive and principal financial officers and effected by the company’s board of directors, management and other personnel, to providereasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generallyaccepted accounting principles and includes those policies and procedures that:•Pertain to the maintenance of records that in reasonable detail accurately and fairly reflect the transactions and dispositions of the assets of the company;•Provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generallyaccepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations ofmanagement and directors of the company; and•Provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of the company’s assets that couldhave a material effect on the financial statements.Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation ofeffectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance withthe policies or procedures may deteriorate. Internal control over financial reporting cannot provide absolute assurance of achieving financial reporting objectivesbecause of its inherent limitations. Internal control over financial reporting is a process that involves human diligence and compliance and is subject to lapses injudgment and breakdowns resulting from human failures. Internal control over financial reporting also can be circumvented by collusion or improper managementoverride. Because of such limitations, there is a risk that material misstatements may not be prevented or detected on a timely basis by internal control overfinancial reporting. However, these inherent limitations are known features of the financial reporting process. Therefore, it is possible to design into the processsafeguards to reduce, though not eliminate, this risk.The company’s management assessed the effectiveness of the company’s internal control over financial reporting as of December 31, 2017 . In making thisassessment, the company’s management used the criteria set forth in Internal Control—Integrated Framework (2013) issued by the Committee of SponsoringOrganizations of the Treadway Commission (COSO). Based on their assessment, the company’s management concluded that, as of December 31, 2017 , thecompany’s internal control over financial reporting was effective based on those criteria.The effectiveness of the company’s internal control over financial reporting as of December 31, 2017 , has been audited by PricewaterhouseCoopers LLP, anindependent registered public accounting firm, as stated in their report which appears herein.74Table of ContentsReport of Independent Registered Public Accounting FirmTo Board of Directors and Shareholders of Unit Corporation:Opinions on the Financial Statements and Internal Control over Financial ReportingWe have audited the accompanying consolidated balance sheets of Unit Corporation and its subsidiaries as of December 31, 2017 and 2016 , and the relatedconsolidated statements of operations, comprehensive income (loss), changes in shareholders’ equity, and cash flows for each of the three years in the period endedDecember 31, 2017 , including the related notes and financial statement schedule listed in the index appearing under Item 15(a)(2) (collectively referred to as the“consolidated financial statements”). We also have audited the Company's internal control over financial reporting as of December 31, 2017 , based on criteriaestablished in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as ofDecember 31, 2017 and 2016 , and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2017 inconformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Company maintained, in all material respects,effective internal control over financial reporting as of December 31, 2017 , based on criteria established in Internal Control - Integrated Framework (2013) issuedby the COSO.Basis for OpinionsThe Company's management is responsible for these consolidated financial statements, for maintaining effective internal control over financial reporting, and forits assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management's Report on Internal Control overFinancial Reporting. Our responsibility is to express opinions on the Company’s consolidated financial statements and on the Company's internal control overfinancial reporting based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States)("PCAOB") and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules andregulations of the Securities and Exchange Commission and the PCAOB.We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audits to obtain reasonableassurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud, and whether effective internalcontrol over financial reporting was maintained in all material respects.Our audits of the consolidated financial statements included performing procedures to assess the risks of material misstatement of the consolidated financialstatements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidenceregarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significantestimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. Our audit of internal control over financialreporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing andevaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as weconsidered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.Definition and Limitations of Internal Control over Financial ReportingA company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and thepreparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financialreporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactionsand dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financialstatements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance withauthorizations of management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorizedacquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.75Table of ContentsBecause of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation ofeffectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance withthe policies or procedures may deteriorate./s/ PricewaterhouseCoopers LLPTulsa, OklahomaFebruary 27, 2018We have served as the Company’s auditor since 1989. 76Table of ContentsUNIT CORPORATION AND SUBSIDIARIESCONSOLIDATED BALANCE SHEETS As of December 31, 2017 2016 (In thousands except share and par valueamounts)ASSETS Current assets: Cash and cash equivalents$701 $893Accounts receivable (less allowance for doubtful accounts of $2,450 and $3,773 at December 31, 2017 and 2016,respectively)111,512 83,954Materials and supplies505 3,340Current derivative asset (Note 12)721 —Current deferred tax asset (Note 8)— 25,211Prepaid expenses and other6,233 7,798Total current assets119,672 121,196Property and equipment: Oil and natural gas properties, on the full cost method: Proved properties5,712,813 5,446,305Unproved properties not being amortized296,764 314,867Drilling equipment1,593,611 1,565,268Gas gathering and processing equipment726,236 705,859Saltwater disposal systems62,618 60,638Corporate land and building59,080 59,066Transportation equipment29,631 32,842Other53,439 48,590 8,534,192 8,233,435Less accumulated depreciation, depletion, amortization, and impairment6,151,450 5,952,330Net property and equipment2,382,742 2,281,105Goodwill (Note 2)62,808 62,808Non-current derivative asset (Note 12)— 377Other assets16,230 13,817Total assets$2,581,452 $2,479,30377Table of ContentsUNIT CORPORATION AND SUBSIDIARIESCONSOLIDATED BALANCE SHEETS - (Continued) As of December 31, 2017 2016 (In thousands except share and par valueamounts)LIABILITIES AND SHAREHOLDERS’ EQUITY Current liabilities: Accounts payable$112,648 $88,793Accrued liabilities (Note 5)48,523 39,651Current derivative liabilities (Note 12)7,763 21,564Current portion of other long-term liabilities (Note 6)13,002 14,907Total current liabilities181,936 164,915Long-term debt less unamortized discount and debt issuance costs (Note 6)820,276 800,917Non-current derivative liabilities (Note 12)— 415Other long-term liabilities (Note 6)100,203 103,064Deferred income taxes (Note 8)133,477 215,922Commitments and contingencies (Note 14)— —Shareholders’ equity: Preferred stock, $1.00 par value, 5,000,000 shares authorized, none issued— —Common stock, $0.20 par value, 175,000,000 shares authorized, 52,880,134 and 51,494,318 shares issued as ofDecember 31, 2017 and 2016, respectively10,280 10,016Capital in excess of par value535,815 502,500Accumulated other comprehensive income (net of tax of $39 at December 31, 2017) (Note 15)63 —Retained earnings799,402 681,554Total shareholders’ equity1,345,560 1,194,070Total liabilities and shareholders’ equity$2,581,452 $2,479,303The accompanying notes are an integral part of the consolidated financial statements.78Table of ContentsUNIT CORPORATION AND SUBSIDIARIESCONSOLIDATED STATEMENTS OF OPERATIONS Year Ended December 31, 2017 2016 2015 (In thousands except per share amounts)Revenues: Oil and natural gas$357,744 $294,221 $385,774Contract drilling174,720 122,086 265,668Gas gathering and processing207,176 185,870 202,789Total revenues739,640 602,177 854,231Expenses: Operating costs: Oil and natural gas130,789 120,184 166,046Contract drilling122,600 88,154 156,408Gas gathering and processing155,483 137,609 161,556Total operating costs408,872 345,947 484,010 Depreciation, depletion, and amortization209,257 208,353 352,742Impairments— 161,563 1,634,628General and administrative38,087 33,337 34,358(Gain) loss on disposition of assets(327) (2,540) 7,229Total expenses655,889 746,660 2,512,967Income (loss) from operations83,751 (144,483) (1,658,736)Other income (expense): Interest, net(38,334) (39,829) (31,963)Gain (loss) on derivatives14,732 (22,813) 26,345Other21 307 45Total other income (expense)(23,581) (62,335) (5,573)Income (loss) before income taxes60,170 (206,818) (1,664,309)Income tax expense (benefit): Current5 15 (20,616)Deferred(57,683) (71,209) (606,332)Total income taxes(57,678) (71,194) (626,948)Net income (loss)$117,848 $(135,624) $(1,037,361)Net income (loss) per common share: Basic$2.31 $(2.71) $(21.12)Diluted$2.28 $(2.71) $(21.12)The accompanying notes are an integral part of the consolidated financial statements.79Table of ContentsUNIT CORPORATION AND SUBSIDIARIESCONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) For Years Ended December 31, 2017 2016 2015 (In thousands)Net income (loss)$117,848 $(135,624) $(1,037,361)Other comprehensive income, net of taxes: Unrealized appreciation on securities, net of tax of $39, $0, and $063 — —Comprehensive income (loss)$117,911 $(135,624) $(1,037,361)The accompanying notes are an integral part of theseunaudited condensed consolidated financial statements.80Table of ContentsUNIT CORPORATION AND SUBSIDIARIESCONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITYYear Ended December 31, 2015 , 2016 , and 2017 CommonStock Capital In Excessof Par Value Accumulated OtherComprehensive Income RetainedEarnings Total (In thousands except per share amounts)Balances, January 1, 2015$9,732 $468,123 $— $1,854,539 $2,332,394Net loss— — — (1,037,361) (1,037,361)Activity in employee compensation plans(819,289 shares)99 18,448 — — 18,547Balances, December 31, 20159,831 486,571 — 817,178 1,313,580Net loss— — — (135,624) (135,624)Activity in employee compensation plans(1,081,217 shares)185 15,929 — — 16,114Balances, December 31, 201610,016 502,500 — 681,554 1,194,070Net income— — — 117,848 117,848Other comprehensive income (net of tax $39)— — 63 — 63Total comprehensive income 117,911Proceeds from sale of stock (787,547 shares)158 18,465 — — 18,623Activity in employee compensation plans(598,269 shares)106 14,850 — — 14,956Balances, December 31, 2017$10,280 $535,815 $63 $799,402 $1,345,560The accompanying notes are an integral part of the consolidated financial statements.81Table of ContentsUNIT CORPORATION AND SUBSIDIARIESCONSOLIDATED STATEMENTS OF CASH FLOWS Year Ended December 31, 2017 2016 2015 (In thousands)OPERATING ACTIVITIES: Net income (loss)$117,848 $(135,624) $(1,037,361)Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities: Depreciation, depletion, and amortization209,257 208,353 352,742Impairments (Note 2)— 161,563 1,634,628Amortization of debt issuance costs and debt discount2,159 2,122 2,088(Gain) loss on derivatives(14,732) 22,813 (26,345)Cash receipts on derivatives settled173 9,658 46,615(Gain) loss on disposition of assets(327) (3,127) 7,229Deferred tax benefit(57,683) (71,209) (606,332)Employee stock compensation plans17,747 13,812 21,468Bad debt expense348 785 1,191ARO liability accretion2,886 2,779 3,453Other, net(865) (6,037) (1,517)Changes in operating assets and liabilities increasing (decreasing) cash: Accounts receivable(32,073) (11,796) 105,426Materials and supplies2,835 225 1,507Prepaid expenses and other1,527 2,585 7,134Accounts payable21,824 27,400 (20,306)Accrued liabilities6,996 (4,388) (22,920)Income taxes38 20,903 (21,482)Contract advances1,630 (687) (274)Net cash provided by operating activities279,588 240,130 446,944INVESTING ACTIVITIES: Capital expenditures(269,185) (186,149) (561,453)Producing property and other acquisitions(58,026) (564) (179)Proceeds from disposition of property and equipment21,713 74,823 11,854Other(1,500) 919 —Net cash used in investing activities(306,998) (110,971) (549,778)FINANCING ACTIVITIES: Borrowings under line of credit343,900 251,398 618,500Payments under line of credit(326,700) (371,600) (503,500)Payments on capitalized leases(3,694) (3,694) (3,549)Proceeds from common stock issued, net of issue costs (Note 15)18,623 — —Tax expense from stock compensation— (376) (3,207)Decrease in book overdrafts (Note 2)(4,911) (4,829) (5,624)Net cash provided by (used in) financing activities27,218 (129,101) 102,620Net increase (decrease) in cash and cash equivalents(192) 58 (214)Cash and cash equivalents, beginning of year893 835 1,049Cash and cash equivalents, end of year$701 $893 $835Supplemental disclosure of cash flow information: Cash paid during the year for: Interest paid (net of capitalized)$33,931 $35,690 $30,910Income taxes$— $42 $3,540Changes in accounts payable and accrued liabilities related to purchases of property, plant, andequipment$(6,942) $21,190 $105,157Non-cash reductions to oil and natural gas properties related to asset retirement obligations$3,613 $30,897 $5,694The accompanying notes are an integral part of the consolidated financial statements.82Table of ContentsUNIT CORPORATION AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTSNOTE 1 – ORGANIZATIONUnless the context clearly indicates otherwise, references in this report to “Unit”, “Company”, “we”, “our”, “us”, or like terms refer to Unit Corporation andits subsidiaries.We are primarily engaged in the exploration, development, acquisition, and production of oil and natural gas properties, the land contract drilling of naturalgas and oil wells, and the buying, selling, gathering, processing, and treating of natural gas. Our operations are principally in the United States and are organized inthe following three reporting segments: (1) Oil and Natural Gas, (2) Contract Drilling, and (3) Mid-Stream.Oil and Natural Gas. Carried out by our subsidiary, Unit Petroleum Company, we explore, develop, acquire, and produce oil and natural gas properties forour own account. Our producing oil and natural gas properties, unproved properties, and related assets are mainly in Oklahoma and Texas, and to a lesser extent, inArkansas, Colorado, Kansas, Louisiana, Montana, New Mexico, North Dakota, Utah, and Wyoming.Contract Drilling. Carried out by our subsidiary, Unit Drilling Company, we drill onshore oil and natural gas wells for our own account and for a widerange of other oil and natural gas companies. Our drilling operations are mainly in Oklahoma, Texas, Wyoming, North Dakota, and to a lesser extent in Louisianaand Kansas.Mid-Stream. Carried out by our subsidiary, Superior Pipeline Company, L.L.C. and its subsidiaries, we buy, sell, gather, transport, process, and treat naturalgas for our own account and for third parties. Mid-stream operations are performed in Oklahoma, Texas, Kansas, Pennsylvania, and West Virginia.NOTE 2 – SUMMARY OF SIGNIFICANT ACCOUNTING POLICIESPrinciples of Consolidation. The consolidated financial statements include the accounts of Unit Corporation and its subsidiaries. Our investment in limitedpartnerships is accounted for on the proportionate consolidation method, whereby our share of the partnerships’ assets, liabilities, revenues, and expenses areincluded in the appropriate classification in the accompanying consolidated financial statements.Certain amounts in the accompanying consolidated financial statements for prior periods have been reclassified to conform to current year presentation.Certain financial statement captions were expanded or combined with no impact to consolidated net income or shareholders' equity.Accounting Estimates. The preparation of financial statements in conformity with generally accepted accounting principles (GAAP) requires managementto make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of thefinancial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.Drilling Contracts. We recognize revenues and expenses generated from “daywork” drilling contracts as the services are performed, since we do not bearthe risk of completion of the well. Under “footage” and “turnkey” contracts, we bear the risk of completion of the well; therefore, revenues and expenses arerecognized when the well is substantially completed. Under this method, substantial completion is determined when the well bore reaches the negotiated depth asstated in the contract. The entire amount of a loss, if any, is recorded when the loss is determinable. The costs of uncompleted drilling contracts include expensesincurred to date on “footage” or “turnkey” contracts, which are still in process at the end of the period, and are included in other current assets. Typically, any oneof these three types of contracts can be used for the drilling of one well which can take from 10 to 90 days. At December 31, 2017 , all of our contracts weredaywork contracts of which nine were multi-well and had durations which ranged from six months to two years , eight of which expire in 2018 and one expiring in2019. These longer term contracts may contain a fixed rate for the duration of the contract or provide for the periodic renegotiation of the rate within a specificrange from the existing rate.Cash Equivalents and Book Overdrafts. We include as cash equivalents all investments with maturities at date of purchase of three months or less whichare readily convertible into known amounts of cash. Book overdrafts are checks that83Table of ContentsUNIT CORPORATION AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)have been issued before the end of the period, but not presented to our bank for payment before the end of the period. At December 31, 2017 and 2016 , bookoverdrafts were $12.4 million and $17.3 million , respectively.Accounts Receivable. Accounts receivable are carried on a gross basis, with no discounting, less an allowance for doubtful accounts. We estimate theallowance for doubtful accounts based on existing economic conditions, the financial condition of our customers, and the amount and age of past due accounts.Receivables are considered past due if full payment is not received by the contractual due date. Past due accounts are generally written off against the allowancefor doubtful accounts only after all collection attempts have been unsuccessful.Financial Instruments and Concentrations of Credit Risk and Non-performance Risk. Financial instruments, which potentially subject us toconcentrations of credit risk, consist primarily of trade receivables with a variety of oil and natural gas companies. We do not generally require collateral related toreceivables. Our credit risk is considered to be limited due to the large number of customers comprising our customer base. Below are the third-party customersthat accounted for more than 10% of our segment’s revenues: 2017 2016 2015Oil and Natural Gas: Sunoco Logistics Partners L.P.10% 24% 19%Valero Energy Corporation9% 11% 15%Drilling: QEP Resources, Inc.26% 28% 25%Whiting Petroleum Corp. (formerly Kodiak Oil and Gas Corp.)7% 18% 7%Mid-Stream: ONEOK, Inc.36% 30% 29%Range Resources Corporation9% 10% 5%Koch Energy Services, LLC8% 11% 9%Tenaska Resources, LLC6% 10% 18%Laclede Group, Inc.1% 9% 12%We had a concentration of cash of $11.4 million and $8.3 million at December 31, 2017 and 2016 , respectively with one bank.The use of derivative transactions also involves the risk that the counterparties will be unable to meet the financial terms of the transactions. We consideredthis non-performance risk with regard to our counterparties and our own non-performance risk in our derivative valuation at December 31, 2017 and determinedthere was no material risk at that time. At December 31, 2017 , the fair values of the net assets (liabilities) we had with each of the counterparties with respect to allof our commodity derivative transactions are listed in the table below: December 31, 2017 (In millions)Canadian Imperial Bank of Commerce$0.7Bank of America Merrill Lynch(2.5)Bank of Montreal(5.3)Total assets (liabilities)$(7.1)Property and Equipment. Drilling equipment, transportation equipment, gas gathering and processing systems, and other property and equipment arecarried at cost less accumulated depreciation. Renewals and enhancements are capitalized while repairs and maintenance are expensed. Depreciation of drillingequipment is recorded using the units-of-production method based on estimated useful lives starting at 15 years , including a minimum provision of 20% of theactive rate when the equipment is idle. We use the composite method of depreciation for drill pipe and collars and calculate the depreciation by footage actuallydrilled compared to total estimated remaining footage. Depreciation on our corporate building is computed using the straight-line method over the estimated usefullife of the asset for 39 years. Depreciation of other property and equipment is computed using the straight-line method over the estimated useful lives of the assetsranging from 3 to 15 years.84Table of ContentsUNIT CORPORATION AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)We review the carrying amounts of long-lived assets for potential impairment annually, typically during the fourth quarter, or when events occur or changesin circumstances suggest that these carrying amounts may not be recoverable. Changes that could prompt such an assessment may include equipment obsolescence,changes in the market demand for a specific asset, changes in commodity prices, periods of relatively low drilling rig utilization, declining revenue per day,declining cash margin per day, or overall changes in general market conditions. Assets are determined to be impaired if a forecast of undiscounted estimated futurenet operating cash flows directly related to the asset, including disposal value if any, is less than the carrying amount of the asset. If any asset is determined to beimpaired, the loss is measured as the amount by which the carrying amount of the asset exceeds its fair value. The estimate of fair value is based on the bestinformation available, including prices for similar assets. Changes in these estimates could cause us to reduce the carrying value of property and equipment. Assetimpairment evaluations are, by nature, highly subjective. They involve expectations about future cash flows generated by our assets and reflect management’sassumptions and judgments regarding future industry conditions and their effect on future utilization levels, dayrates, and costs. The use of different estimates andassumptions could cause materially different carrying values of our assets.On a periodic basis, we evaluate our fleet of drilling rigs for marketability based on the condition of inactive rigs, expenditures that would be necessary tobring them to working condition and the expected demand for drilling services by rig type. The components comprising inactive rigs are evaluated, and thosecomponents with continuing utility to the Company’s other marketed rigs are transferred to other rigs or to its yards to be used as spare equipment. The remainingcomponents of these rigs are retired. During 2015, we recorded a write-down on 31 of our drilling rigs and related equipment of approximately $8.3 million pre-taxbased on the estimated market value for similar equipment from auctions sales. We then sold all 31 of these drilling rigs and some other drilling equipment tounaffiliated third parties. The proceeds from the sale of those assets, less costs to sell, was less than the $11.3 million net book value resulting in a loss of $7.3million pre-tax. When property and equipment components are disposed of, the cost and the related accumulated depreciation are removed from the accounts andany resulting gain or loss is generally reflected in operations. Our contract drilling segment had no impairments in either 2016 or 2017. For dispositions of drillpipe and drill collars, an average cost for the appropriate feet of drill pipe and drill collars is removed from the asset account and charged to accumulateddepreciation and proceeds, if any, are credited to accumulated depreciation.In 2015, our mid-stream segment incurred a $27.0 million , pre-tax write-down of three of its systems, Bruceton Mills, Midwell, and Spring Creek due toanticipated future cash flow and future development around these systems not being sufficient to support their carrying value. The estimated future cash flows wereless than the carrying value on these systems. Our mid-stream segment had no impairments in either 2016 or 2017.We record an asset and a liability equal to the present value of the expected future ARO associated with our oil and gas properties. The ARO asset isdepreciated in a manner consistent with the depreciation of the underlying physical asset. We measure changes in the liability due to passage of time by accretingan interest charge. This amount is recognized as an increase in the carrying amount of the liability and as a corresponding accretion expense.Capitalized Interest. During 2017 , 2016 , and 2015 , interest of approximately $15.9 million , $15.3 million , and $21.7 million , respectively, wascapitalized based on the net book value associated with unproved properties not being amortized, the construction of additional drilling rigs, and the construction ofgas gathering systems. Interest is being capitalized using a weighted average interest rate based on our outstanding borrowings.Goodwill. Goodwill represents the excess of the cost of acquisitions over the fair value of the net assets acquired. Goodwill is not amortized, but animpairment test is performed at least annually to determine whether the fair value has decreased and is performed additionally when events indicate an impairmentmay have occurred. For impairment testing, goodwill is evaluated at the reporting unit level. Our goodwill is all related to our contract drilling segment, and, theimpairment test is generally based on the estimated discounted future net cash flows of our drilling segment, utilizing discount rates and other factors indetermining the fair value of our drilling segment. Inputs in our estimated discounted future net cash flows include drilling rig utilization, day rates, gross marginpercentages, and terminal value. No goodwill impairment was recorded for the years ended December 31, 2017 , 2016 , or 2015 . There were no additions togoodwill in 2017 , 2016 , or 2015 . Based on our impairment test performed as of December 31, 2017 , the fair value of our drilling segment exceeded its carryingvalue by 41% . Goodwill of $0.7 million is deductible for tax purposes.Oil and Natural Gas Operations. We account for our oil and natural gas exploration and development activities using the full cost method of accountingprescribed by the SEC. Accordingly, all productive and non-productive costs incurred in connection with the acquisition, exploration and development of our oil,NGLs, and natural gas reserves, including directly related overhead costs and related asset retirement costs, are capitalized and amortized on a units-of-productionmethod based85Table of ContentsUNIT CORPORATION AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)on proved oil and natural gas reserves. Directly related overhead costs of $14.8 million , $15.4 million , and $19.2 million were capitalized in 2017 , 2016 , and2015 , respectively. Independent petroleum engineers annually audit our internal evaluation of our reserves. The average rates used for DD&A were $6.00 , $6.24 ,and $12.30 per Boe in 2017 , 2016 , and 2015 , respectively. The calculation of DD&A includes all capitalized costs, estimated future expenditures to be incurredin developing proved reserves and estimated dismantlement and abandonment costs, net of estimated salvage values less accumulated amortization, unprovedproperties, and equipment not placed in service. Our unproved properties and wells in progress totaling $296.8 million are excluded from the DD&A calculation.No gains or losses are recognized on the sale, conveyance, or other disposition of oil and natural gas properties unless a significant reserve amount to ourtotal reserves is involved.Revenue from the sale of oil and natural gas is recognized when title passes, net of royalties.Under the full cost rules, at the end of each quarter, we review the carrying value of our oil and natural gas properties. The full cost ceiling is basedprincipally on the estimated future discounted net cash flows from our oil and natural gas properties discounted at 10% . We use the unweighted arithmetic averageof the commodity prices existing on the first day of each of the 12 months before the end of the reporting period to calculate discounted future revenues, unlessprices were otherwise determined under contractual arrangements. In the event the unamortized cost of oil and natural gas properties being amortized exceeds thefull cost ceiling, as defined by the SEC, the excess is charged to expense in the period during which such excess occurs. Once incurred, a write-down of oil andnatural gas properties is not reversible.We determined the value of certain unproved oil and gas properties were diminished (in part or in whole) based on an impairment evaluation and ouranticipated future exploration plans. Those determinations resulted in $114.4 million , $7.6 million , and $10.5 million in 2015, 2016, and 2017, respectively ofcosts being added to the total of our capitalized costs being amortized. In 2015, we incurred non-cash ceiling test write-downs of our oil and natural gas propertiesof $1.6 billion pre-tax ( $1.0 billion net of tax) primarily due to the reduction of the 12-month average commodity prices during the year. In 2016, we incurred non-cash ceiling test write-downs of our oil and natural gas properties of $161.6 million pre-tax ( $100.6 million net of tax) due to the reduction of the 12-monthaverage commodity prices during the first three quarters of the year. We had no non-cash ceiling test write-downs during 2017.Our contract drilling segment provides drilling services for our exploration and production segment. Depending on the timing of the drilling servicesperformed on our properties those services may be deemed, for financial reporting purposes, to be associated with the acquisition of an ownership interest in theproperty. Revenues and expenses for these services are eliminated in our statement of operations, with any profit recognized reducing our investment in our oil andnatural gas properties. The contracts for these services are issued under the similar terms and rates as the contracts entered into with unrelated third parties. Byproviding drilling services for the oil and natural gas segment, we eliminated revenue of $13.4 million and $22.1 million during 2017 and 2015 , respectively, fromour contract drilling segment and eliminated the associated operating expense of $11.8 million and $18.3 million during 2017 and 2015 , respectively, yielding $1.6million and $3.8 million during 2017 and 2015 , respectively, as a reduction to the carrying value of our oil and natural gas properties. We eliminated no revenue orexpenses in our contract drilling segment during 2016.ARO. We record the fair value of liabilities associated with the future plugging and abandonment of wells. In our case, when the reserves in each of our oilor gas wells deplete or otherwise become uneconomical, we must incur costs to plug and abandon the wells. These costs are recorded in the period in which theliability is incurred (at the time the wells are drilled or acquired). We have no assets restricted to settle these ARO liabilities. Our engineering staff uses historicalexperience to determine the estimated plugging costs considering the type of well (either oil or natural gas), the depth of the well, the physical location of the well,and the ultimate productive life to determine the estimated plugging costs. A risk-adjusted discount rate and an inflation factor are used on these estimated costs todetermine the current present value of this obligation. To the extent any change in these assumptions affect future revisions and impact the present value of theexisting ARO, a corresponding adjustment is made to the full cost pool.Gas Gathering and Processing Revenue. Our gathering and processing segment recognizes revenue from the gathering and processing of natural gas andNGLs in the period the service is provided based on contractual terms.Insurance. We are self-insured for certain losses relating to workers’ compensation, control of well and employee medical benefits. Insured policies forother coverage contain deductibles or retentions per occurrence that range from zero to $1.0 million . We have purchased stop-loss coverage in order to limit, to theextent feasible, per occurrence and aggregate86Table of ContentsUNIT CORPORATION AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)exposure to certain types of claims. There is no assurance that the insurance coverages we have will adequately protect us against liability from all potentialconsequences. If insurance coverage becomes more expensive, we may choose to self-insure, decrease our limits, raise our deductibles, or any combination ofthese rather than pay higher premiums.Derivative Activities. All derivatives are recognized on the balance sheet and measured at fair value with the exception of normal purchase and normal saleswhich are expected to result in physical delivery. Any changes in our derivatives' fair value occurring before their maturity (i.e., temporary fluctuations in value)are reported in gain (loss) on derivatives in our Consolidated Statements of Operations.We document our risk management strategy and do not engage in derivative transactions for speculative purposes.Limited Partnerships. Unit Petroleum Company is a general partner in 13 oil and natural gas limited partnerships sold privately and publicly. Some of ourofficers, directors, and employees own the interests in most of these partnerships. We share in each partnership’s revenues and costs in accordance with formulasset out in each of the limited partnership agreement. The partnerships also reimburse us for certain administrative costs incurred on behalf of the partnerships.Income Taxes. During the fourth quarter of 2017, the U.S. government enacted the Tax Act. Among other provisions, the Tax Act reduces the federalcorporate tax rate from the existing maximum rate of 35% to 21% , effective January 1, 2018. The change in tax law required the Company to remeasure existingnet deferred tax liabilities using the lower rate in the period of enactment resulting in the Company recording a tax benefit of $81.3 million in 2017 due to arevaluation of our net deferred tax liability. Measurement of net deferred tax liabilities is based on provisions of enacted tax law (including the Tax Act); theeffects of future changes in tax laws or rates are not included in the measurement. Valuation allowances are established where necessary to reduce deferred taxassets to the amount expected to be realized. Income tax expense is the tax payable for the year and the change during that year in deferred tax assets and liabilities.The accounting for uncertainty in income taxes prescribes a recognition threshold and measurement attribute for the financial statement recognition andmeasurement of a tax position taken or expected to be taken in a return. Guidance is also provided on de-recognition, classification, interest and penalties,accounting in interim periods, disclosure, and transition.Natural Gas Balancing. We use the sales method for recording natural gas sales. This method allows for recognition of revenue, which may be more orless than its share of pro-rata production from certain wells. We estimate our December 31, 2017 balancing position to be approximately 3.7 Bcf on under-produced properties and approximately 3.8 Bcf on over-produced properties. We have recorded a receivable of $2.4 million on certain wells where we estimate thatinsufficient reserves are available for us to recover the under-production from future production volumes. We have also recorded a liability of $3.3 million oncertain properties where we believe there are insufficient reserves available to allow the under-produced owners to recover their under-production from futureproduction volumes. Our policy is to expense the pro-rata share of lease operating costs from all wells as incurred. Such expenses relating to the balancing positionon wells in which we have imbalances are not material.Employee and Director Stock Based Compensation. We recognize in our financial statements the cost of employee services received in exchange forawards of equity instruments based on the grant date fair value of those awards. The amount of our equity compensation cost relating to employees directlyinvolved in exploration activities of our oil and natural gas segment is capitalized to our oil and natural gas properties. Amounts not capitalized to our oil andnatural gas properties are recognized in general and administrative expense and operating costs of our business segments. We utilize the Black-Scholes optionpricing model to measure the fair value of stock options and SARs. The value of our restricted stock grants is based on the closing stock price on the date of thegrants.New Accounting StandardsCompensation—Stock Compensation. The FASB issued ASU 2017-09, to clarify and reduce both (i) diversity in practice and (ii) cost and complexity whenapplying its guidance to changes in the terms of a share-based payment award. The amendment is effective for reporting periods beginning after December 15,2017. This amendment will not have a material impact on our financial statements.Intangibles—Goodwill and Other: Simplifying the Test for Goodwill Impairment. The FASB issued ASU 2017-04, to simplify the measurement of goodwill.The amendment eliminates Step 2 from the goodwill impairment test. The amendment87Table of ContentsUNIT CORPORATION AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)will be effective prospectively for reporting periods beginning after December 15, 2019, and early adoption is permitted. This amendment will not have a materialimpact on our financial statements.Business Combinations; Clarifying the Definition of a Business. The FASB issued ASU 2017-01, clarifying the definition of a business. The amendmentshould help companies and other organizations evaluate whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. Forpublic companies, the amendment is effective for annual periods beginning after December 15, 2017. This amendment will not have a material impact on ourfinancial statements.Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payments. The FASB issued ASU 2016-15, to address diversity in how certaintransactions are presented and classified in the statement of cash flows. The amendment will be effective retrospectively for reporting periods beginning afterDecember 31, 2017, and early adoption is permitted. This amendment will not have a material impact on our financial statements.Leases. The FASB has issued ASU 2016-02. The amendment will require lessees to recognize at the commencement date a lease liability, which is a lessee'sobligation to make lease payments arising from a lease, measured on a discounted basis; and a right-of-use asset, which is an asset that represents the lessee's rightto use a specified asset for the lease term. Lessor accounting is largely unchanged. For public companies, the amendment is effective for annual periods beginningafter December 15, 2018, and interim periods within those annual periods. The standard will not apply to leases of mineral rights. We are evaluating the impact thisamendment will have on our financial statements and currently evaluating a plan for implementation.Revenue from Contracts with Customers. The FASB has issued ASU 2014-09. This standard affects any entity using U.S. GAAP that either contracts withcustomers to transfer goods or services or enters into contracts for transferring nonfinancial assets unless those contracts are within the scope of other standards(e.g., insurance contracts or lease contracts). The core principle of the amendments is that an entity should recognize revenue to depict the transfer of promisedgoods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU2014-09 has been amended several times pre-issuance, which is codified in the new Topic 606, effective January 1, 2018. The guidance in this update supersedesthe revenue recognition requirements in Topic 605, Revenue Recognition, and most industry-specific guidance throughout the Industry Topics of the Codification.We adopted this standard January 1, 2018 using the modified retrospective approach, which resulted in a cumulative effect adjustment upon adoption for our mid-stream segment. This adjustment related to the timing of revenue on certain demand fees which was not material to the company. Both our oil and natural gas andcontract drilling segments had no retained earnings adjustment.The application of Topic 606 will not have a material effect on our statement of operations or our balance sheet, as the timing of revenue recognized will notbe materially modified, but additional footnote disclosures are required with respect to revenue. In our oil and natural gas segment, the classification of certaincosts as either a deduction from revenue or an expense will be determined based on when control of the commodity transfers to the customer, which would impacttotal revenue recognized, but will not affect gross profit.Part of our review included evaluation of these issues:•Based on an analysis of whether the transportation of gas is a performance obligation that occurs at a point in time or over time, the timing of when werecognize certain revenue elements will change. Specifically related to our mid-stream segment, certain fees collectible during a contract will berecognized over the life of the contract because these fees are part of the single performance obligation associated with the contract.•Certain of our contracts include promises to deliver a minimum volume of commodity to the customer over a defined period. If we do not meet thiscommitment, a deficiency fee is payable to the customer. Topic 606 requires these arrangements represent variable consideration related to the sale of thecommodity, and requires that we include an estimate of any deficiency fees expected within revenue, rather than as operating costs. In addition, we willalso be required to analyze fees that are billable for deficiencies in minimum volume commitments from customers for our mid-stream segment. In theseinstances, we will assess the likelihood of earning these fees each reporting period based on the customer’s performance and recognize variable revenuewhen it is not expected to be subject to a significant reversal.88Table of ContentsUNIT CORPORATION AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)Our internal control framework did not materially change, but the existing internal controls have been modified to consider our new revenue recognitionpolicy effective January 1, 2018. As we implement the new standard, we have added internal controls to ensure that we adequately evaluate new contracts underthe five-step model under ASU 2014-09.Adopted StandardsIncome Taxes: Balance Sheet Classification of Deferred Taxes. The FASB has issued ASU 2015-17. This changes how deferred taxes are classified onorganizations' balance sheets. Organizations must classify all deferred tax assets and liabilities as noncurrent. The amendments apply to all organizations thatpresent a classified balance sheet. For public companies, the amendments were effective for financial statements issued for annual periods beginning afterDecember 15, 2016, and interim periods within those annual periods. The amendment requires current deferred tax assets to be combined with noncurrent deferredtax assets. We have adopted this ASU during the first quarter of 2017 on a prospective basis. Previously, we had a net current deferred tax asset now netted withour noncurrent deferred tax liability. P rior periods were not retrospectively adjusted.Compensation—Stock Compensation: Improvements to Employee Share-Based Payment Accounting. The FASB has issued ASU 2016-09. The amendmentshould improve the accounting for employee share-based payments and affect all organizations that issue share-based payment awards to their employees. Severalaspects of the accounting for share-based payment award transactions are simplified, including: (a) income tax consequences; (b) classification of awards as eitherequity or liabilities; and (c) classification on the statement of cash flows. For public companies, the amendment was effective for annual periods beginning afterDecember 15, 2016, and interim periods within those annual periods. The amendment primarily affects classification within the statement of cash flows betweenfinancial and operating activities. This did not have a material impact on our financial statements.NOTE 3 – ACQUISITIONS AND DIVESTITURESAcquisitionsOn April 3, 2017, we closed on an acquisition of certain oil and natural gas assets located primarily in Grady and Caddo Counties in western Oklahoma. Thefinal adjusted value of consideration given was $54.3 million .As of January 1, 2017 , the effective date of the acquisition, the estimated proved oil and gas reserves of the acquired properties were 3.2 million barrels ofoil equivalent (MMBoe). The acquisition added approximately 8,300 net oil and gas leasehold acres to our core Hoxbar area in southwestern Oklahoma includingapproximately 47 proved developed producing wells. Of the acreage acquired, approximately 71% was held by production. We also received one gathering systemas part of the transaction.We accounted for this acquisition using the acquisition method under ASC 805, Business Combinations , which requires that the acquired assets andliabilities be recorded at their fair values as of the acquisition date. The following table summarizes the final adjusted purchase price and the values of assetsacquired and liabilities assumed.Final Adjusted Purchase Price Total consideration given$54,332 Final Adjusted Allocation of Purchase Price Oil and natural gas properties included in the full cost pool: Proved oil and natural gas properties$43,745Undeveloped oil and natural gas properties8,650Total oil and natural gas properties included in the full cost pool (1)52,395Gas gathering equipment and other2,340Asset retirement obligation(403)Fair value of net assets acquired$54,332(1)We used a discounted cash flow model and made market assumptions as to future commodity prices, projections of estimated quantities of oil and natural gas reserves, expectations fortiming and amount of future development and operating costs, projections of future rates of production, expected recovery rates, and risk adjusted discount rates.89Table of ContentsUNIT CORPORATION AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)The pro forma effects of this acquired business are immaterial to the results of operations.For 2017, we had approximately $4.7 million in other acquisitions.DivestituresOil and Natural GasWe had non-core asset sales with proceeds, net of related expenses, of $18.6 million , $67.2 million , and $1.9 million , in 2017 , 2016 , and 2015 ,respectively. Proceeds from these dispositions reduced the net book value of the full cost pool with no gain or loss recognized.Contract DrillingDuring 2015, we recorded a write-down on 31 of our drilling rigs and related equipment of approximately $8.3 million pre-tax based on the estimated marketvalue for similar equipment from auctions sales. We then sold all 31 of these drilling rigs and some other drilling equipment to unaffiliated third parties. Theproceeds from the sale of those assets, less costs to sell, was less than the $11.3 million net book value resulting in a loss of $7.3 million pre-tax.During December 2016 , we sold one idle 1500 HP SCR drilling rig to an unaffiliated third party. The proceeds of this sale, less costs to sell, exceeded the$1.7 million net book value of the drilling rig, resulting in a gain of $1.6 million .We did no t have any divestitures in 2017.NOTE 4 – EARNINGS (LOSS) PER SHAREThe following data shows the amounts used in computing earnings (loss) per share: Income (Loss)(Numerator) WeightedShares(Denominator) Per-ShareAmount (In thousands except per share amounts)For the year ended December 31, 2015: Basic loss per common share$(1,037,361) 49,110 $(21.12)Effect of dilutive stock options, restricted stock, and SARs— — —Diluted loss per common share$(1,037,361) 49,110 $(21.12)For the year ended December 31, 2016: Basic loss per common share$(135,624) 50,029 $(2.71)Effect of dilutive stock options, restricted stock, and SARs— — —Diluted loss per common share$(135,624) 50,029 $(2.71)For the year ended December 31, 2017: Basic earnings per common share$117,848 51,113 $2.31Effect of dilutive restricted stock— 635 (0.03)Diluted earnings per common share$117,848 51,748 $2.28 Due to the net loss for the years ended December 31, 2016 and 2015, approximately 509,000 and 186,000 , respectively, weighted average shares related tostock options, restricted stock, and SARs were antidilutive and were excluded from the earnings per share calculation above.90Table of ContentsUNIT CORPORATION AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)The following options and their average exercise prices were not included in the computation of diluted earnings per share because the option exercise priceswere greater than the average market price of our common stock for the years ended December 31: 2017 2016 2015Options and SARs87,500 199,755 261,270Average exercise price$51.34 $48.79 $50.34NOTE 5 – ACCRUED LIABILITIESAccrued liabilities consisted of the following as of December 31: 2017 2016 (In thousands)Employee costs$19,521 $15,394Lease operating expenses11,819 10,075Interest payable6,745 6,524Taxes3,404 2,219Third-party credits2,240 2,998Other4,794 2,441Total accrued liabilities$48,523 $39,651NOTE 6 – LONG-TERM DEBT AND OTHER LONG-TERM LIABILITIESLong-Term DebtLong-term debt consisted of the following as of December 31: 2017 2016 (In thousands)Credit agreement with average interest rates of 3.4% and 2.8% at December 31, 2017 and 2016, respectively$178,000 $160,8006.625% senior subordinated notes due 2021650,000 650,000Total principal amount$828,000 $810,800Less: unamortized discount(2,234) (2,804)Less: debt issuance costs, net(5,490) (7,079)Total long-term debt$820,276 $800,917Credit Agreement. On April 8, 2016, we amended our Senior Credit Agreement (credit agreement) scheduled to mature on April 10, 2020 . The amount wecan borrow is the lesser of the amount we elect (from time to time) as the commitment amount or the value of the borrowing base as determined by the lenders, butin either event not to exceed the maximum credit agreement amount of $875.0 million . Our elected commitment amount is $475.0 million . Our borrowing base is$475.0 million . We are charged a commitment fee of 0.50% on the amount available but not borrowed. The fee varies based on the amount borrowed as apercentage of the amount of the total borrowing base. We paid $1.0 million in origination, agency, syndication, and other related fees. We are amortizing these feesover the life of the credit agreement. With the new amendment, we pledged the following collateral: (a) 85% of the proved developed producing (discounted aspresent worth at 8% ) total value of our oil and gas properties and (b) 100% of our ownership interest in our mid-stream affiliate, Superior Pipeline Company,L.L.C.The borrowing base amount–which is subject to redetermination by the lenders on April 1st and October 1st of each year, is based primarily on a percentageof the discounted future value of our oil and natural gas reserves and on our cash flows from our mid-stream segment. The October 2017 redetermination did notcause any changes. We or the lenders may request a onetime special redetermination of the borrowing base between each scheduled redetermination. In addition,we may request a redetermination following the completion of an acquisition that meets the requirements set forth in the credit agreement.91Table of ContentsUNIT CORPORATION AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)At our election, any part of the outstanding debt under the credit agreement may be fixed at a London Interbank Offered Rate (LIBOR). LIBOR interest iscomputed as the sum of the LIBOR base for the applicable term plus 2.00% to 3.00% depending on the level of debt as a percentage of the borrowing base and ispayable at the end of each term, or every 90 days , whichever is less. Borrowings not under LIBOR bear interest at the prime rate specified in the credit agreementthat cannot be less than LIBOR plus 1.00% plus a margin . Interest is payable at the end of each month and the principal may be repaid in whole or in part at anytime, without a premium or penalty. At December 31, 2017 , we had $178.0 million outstanding borrowings under our credit agreement.We can use borrowings for financing general working capital requirements for (a) exploration, development, production and acquisition of oil and gasproperties, (b) acquisitions and operation of mid-stream assets, (c) issuance of standby letters of credit, (d) contract drilling services, and (e) general corporatepurposes.The credit agreement prohibits, among other things:•the payment of dividends (other than stock dividends) during any fiscal year over 30% of our consolidated net income for the preceding fiscal year;•the incurrence of additional debt with certain limited exceptions; and•the creation or existence of mortgages or liens, other than those in the ordinary course of business, on any of our properties, except for our lenders.The credit agreement also requires that we have at the end of each quarter:•a current ratio (as defined in the credit agreement) of not less than 1 to 1 .Through the quarter ending March 31, 2019, the credit agreement also requires that we have at the end of each quarter:•a senior indebtedness ratio of senior indebtedness to consolidated EBITDA (as defined in the credit agreement) for the most recently ended rolling fourquarters of no greater than 2.75 to 1 .Beginning with the quarter ending June 30, 2019, and for each quarter ending thereafter, the credit agreement requires:•a leverage ratio of funded debt to consolidated EBITDA (as defined in the credit agreement) for the most recently ended rolling four fiscal quarters of nogreater than 4 to 1 .As of December 31, 2017 , we were in compliance with the covenants contained in the credit agreement.6.625% Senior Subordinated Notes. We have an aggregate principal amount of $650.0 million , 6.625% senior subordinated notes (the Notes). Interest on theNotes is payable semi-annually (in arrears) on May 15 and November 15 of each year. The Notes will mature on May 15, 2021 . In connection with the issuance ofthe Notes, we incurred $14.7 million of fees that are being amortized as debt issuance cost over the life of the Notes.The Notes are subject to an Indenture dated as of May 18, 2011, between us and Wilmington Trust, National Association (successor to Wilmington TrustFSB), as Trustee (the Trustee), as supplemented by the First Supplemental Indenture dated as of May 18, 2011, between us, the Guarantors, and the Trustee, and asfurther supplemented by the Second Supplemental Indenture dated as of January 7, 2013, between us, the Guarantors and the Trustee (as supplemented, the 2011Indenture), establishing the terms and providing for issuing the Notes. The Guarantors are our direct and indirect subsidiaries. The discussion of the Notes in thisreport is qualified by and subject to the actual terms of the 2011 Indenture.Unit, as the parent company, has no independent assets or operations. The guarantees by the Guarantors of the Notes (registered under registrationstatements) are full and unconditional, joint and several, subject to certain automatic customary releases, are subject to certain restrictions on the sale, disposition,or transfer of the capital stock or substantially all of the assets of a subsidiary guarantor, and other conditions and terms set out in the Indenture. Any of oursubsidiaries that are not Guarantors are minor. There are no significant restrictions on our ability to receive funds from our subsidiaries through dividends, loans,advances or otherwise.We may redeem all or, from time to time, a part of the Notes at certain redemption prices, plus accrued and unpaid interest. If a “change of control” occurs,subject to certain conditions, we must offer to repurchase from each holder all or any92Table of ContentsUNIT CORPORATION AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)part of that holder’s Notes at a purchase price in cash equal to 101% of the principal amount of the Notes plus accrued and unpaid interest, if any, to the date ofpurchase. The 2011 Indenture contains customary events of default. The 2011 Indenture also contains covenants that, among other things, limit our ability and theability of certain of our subsidiaries to incur or guarantee additional indebtedness; pay dividends on our capital stock or redeem capital stock or subordinatedindebtedness; transfer or sell assets; make investments; incur liens; enter into transactions with our affiliates; and merge or consolidate with other companies. Wewere in compliance with all covenants of the Notes as of December 31, 2017 .Other Long-Term LiabilitiesOther long-term liabilities consisted of the following as of December 31: 2017 2016 (In thousands)ARO liability$69,444 $70,170Capital lease obligations15,224 18,918Workers’ compensation13,340 15,163Separation benefit plans6,524 4,943Deferred compensation plan5,390 4,578Gas balancing liability3,283 3,789Other— 410 113,205 117,971Less current portion13,002 14,907Total other long-term liabilities$100,203 $103,064Estimated annual principal payments under the terms of debt and other long-term liabilities from 2018 through 2022 are $13.0 million , $45.6 million ,$184.7 million , $655.9 million , and $2.1 million , respectively.Capital LeasesDuring 2014, our mid-stream segment entered into capital lease agreements for twenty compressors with initial terms of seven years. The underlying assetsare included in gas gathering and processing equipment. The current portion of our capital lease obligations of $3.8 million is included in current portion of otherlong-term liabilities and the non-current portion of $11.4 million is included in other long-term liabilities in the accompanying Consolidated Balance Sheets as ofDecember 31, 2017 . These capital leases are discounted using annual rates of 4.0% . Total maintenance and interest remaining related to these leases are $5.9million and $1.2 million , respectively at December 31, 2017 . Annual payments, net of maintenance and interest, average $4.2 million annually through 2021 . Atthe end of the term, our mid-stream segment has the option to purchase the assets at 10% of the fair market value of the assets at that time.Future payments required under the capital leases at December 31, 2017 are as follows: AmountEnding December 31, (In thousands)2018 $6,1682019 6,1682020 6,1682021 3,768Total future payments 22,272Less payments related to: Maintenance 5,874Interest 1,174Present value of future minimum payments $15,22493Table of ContentsUNIT CORPORATION AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)NOTE 7 – ASSET RETIREMENT OBLIGATIONSWe are required to record the estimated fair value of the liabilities relating to the future retirement of our long-lived assets (AROs). Our oil and natural gaswells are plugged and abandoned when the oil and natural gas reserves in those wells are depleted or the wells are no longer able to produce. The plugging andabandonment liability for a well is recorded in the period in which the obligation is incurred (at the time the well is drilled or acquired). None of our assets arerestricted for purposes of settling these AROs. All of our AROs relate to plugging costs associated with our oil and gas wells.The following table shows certain information about our AROs for the periods indicated: 2017 2016 (In thousands)ARO liability, January 1:$70,170 $98,297Accretion of discount2,886 2,779Liability incurred1,948 584Liability settled(2,694) (1,215)Liability sold(1,735) (10,882)Revision of estimates (1)(1,131) (19,393)ARO liability, December 31:69,444 70,170Less current portion1,726 2,906Total long-term ARO liability$67,718 $67,264_________________________(1)Plugging liability estimates were revised in both 2017 and 2016 for updates in the cost of services used to plug wells over the preceding year. We had various upward and downwardadjustments and changes in estimated timing of cash flows.NOTE 8 – INCOME TAXESDuring the fourth quarter of 2017, the U.S. government enacted the Tax Act. Among its many provisions, the Tax Act reduces the federal corporate tax ratefrom 35% to 21% , effective January 1, 2018. The change in tax law required the Company to revalue its existing net deferred tax liability using the lower rate inthe period of enactment resulting in the recognition of an income tax benefit of $81.3 million for the year ended December 31, 2017 related to that revaluation. Asa result, the Company recognized an overall income tax benefit of $57.7 million for the year ended December 31, 2017.Also during the fourth quarter of 2017, the SEC issued Staff Accounting Bulletin 118 (SAB 118), which provides guidance on accounting for tax effects ofthe Tax Act. SAB 118 provides a measurement period that should not extend beyond one year from the Tax Act enactment date for companies to complete theaccounting under ASC 740. In accordance with SAB 118, a company must reflect the income tax effects of those aspects of the Act for which the accounting underASC 740 is complete. While we were able to make reasonable estimates of the impact of the reduction in corporate rate, bonus depreciation expensing provisions,and impact of Sec 162(m) to our existing restricted stock grants, the final impact of the Tax Act may differ from these estimates, due to, among other things,changes in our interpretations and assumptions, additional guidance that may be issued by the IRS, and actions we may take.94Table of ContentsUNIT CORPORATION AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)A reconciliation of income tax expense (benefit), computed by applying the federal statutory rate to pre-tax income (loss) to our effective income taxexpense (benefit) is as follows: 2017 2016 2015 (In thousands)Income tax expense (benefit) computed by applying the statutory rate$21,059 $(72,386) $(582,508)State income tax expense (benefit), net of federal benefit1,655 (5,687) (45,768)Deferred tax liability revaluation (1)(81,307) — —Restricted stock shortfall1,867 5,465 —Statutory depletion and other(952) 1,414 1,328Income tax benefit$(57,678) $(71,194) $(626,948)__________________________(1)In 2017, the revaluation from the Tax Act.For the periods indicated, the total provision for income taxes consisted of the following: 2017 2016 2015 (In thousands)Current taxes: Federal$— $— $(20,612)State5 15 (4) 5 15 (20,616)Deferred taxes: Federal(62,788) (62,923) (535,691)State5,105 (8,286) (70,641) (57,683) (71,209) (606,332)Total provision$(57,678) $(71,194) $(626,948) Deferred tax assets and liabilities are comprised of the following at December 31: 2017 2016 (In thousands)Deferred tax assets: Allowance for losses and nondeductible accruals$32,242 $53,967Net operating loss carryforward153,746 190,603Alternative minimum tax and research and development tax credit carryforward5,409 5,409 191,397 249,979Deferred tax liability: Depreciation, depletion, amortization, and impairment(324,874) (440,690)Net deferred tax liability(133,477) (190,711)Current deferred tax asset— 25,211Non-current—deferred tax liability$(133,477) $(215,922)Realization of the deferred tax assets are dependent on generating sufficient future taxable income. Although realization is not assured, management believesit is more likely than not that the deferred tax asset will be realized. The amount of the deferred tax asset considered realizable, however, could be reduced in thenear-term if estimates of future taxable income are reduced. At December 31, 2017 , we have federal net operating loss carryforwards of approximately $587.9million which expire from 2021 to 2037 .We file income tax returns in the U.S. federal jurisdiction and various states. We are no longer subject to U.S. federal tax examinations for years before 2016or state income tax examinations by state taxing authorities for years before 2014. During 2014, we recognized a tax benefit relating to a research and developmenttax credit carryforward in conjunction with our BOSS95Table of ContentsUNIT CORPORATION AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)drilling rig activities. Due to the nature and subjectivity surrounding the research and development credit and historical challenges by the IRS against companieswho claim the credit, it was our belief that the full amount of the credit may not have been eventually allowed by the IRS once we were no longer in an AMT taxpaying position. During 2017, our U.S federal tax returns for 2013, 2014, and 2015 were examined by the IRS and no additional tax was found to be due and theresearch and development tax credit carryforward was allowed in full. Accordingly, we no longer have any unrecognized tax benefits as of December 31, 2017.NOTE 9 – EMPLOYEE BENEFIT PLANSUnder our 401(k) Employee Thrift Plan, employees who meet specified service requirements may contribute a percentage of their total compensation, up to aspecified maximum, to the plan. We may match each employee’s contribution, up to a specified maximum, in full or on a partial basis. We made discretionarycontributions under the plan of 155,822 , 630,039 , and 235,104 shares of common stock and recognized expense of $4.4 million , $4.0 million , and $6.2 million in2017 , 2016 , and 2015 , respectively.We provide a salary deferral plan (Deferral Plan) which allows participants to defer the recognition of salary for income tax purposes until actual distributionof benefits which occurs at either termination of employment, death or certain defined unforeseeable emergency hardships. The liability recorded under theDeferral Plan at December 31, 2017 and 2016 was $5.4 million and $4.6 million , respectively. We recognized payroll expense and recorded a liability at the timeof deferral.Effective January 1, 1997, we adopted a separation benefit plan (Separation Plan). The Separation Plan allows eligible employees whose employment isinvoluntarily terminated or, in the case of an employee who has completed 20 years of service, voluntarily or involuntarily terminated, to receive benefitsequivalent to four weeks salary for every whole year of service completed up to a maximum of 104 weeks. To receive payments, the recipient must waive anyclaims against us in exchange for receiving the separation benefits. On October 28, 1997, we adopted a Separation Benefit Plan for Senior Management (SeniorPlan). The Senior Plan provides certain officers and key executives of Unit with benefits generally equivalent to the Separation Plan. The CompensationCommittee of the Board of Directors has absolute discretion in the selection of the individuals covered in this plan. On May 5, 2004 we also adopted the SpecialSeparation Benefit Plan (Special Plan). This plan is identical to the Separation Benefit Plan with the exception that the benefits under the plan vest on the earliest ofa participant’s reaching the age of 65 or serving 20 years with the company.On December 31, 2008, we amended all three Plans to be in compliance with Section 409A of the Internal Revenue Code of 1986, as amended. The keyamendments to the Plans address, among other things, when distributions may be made, the timing of payments, and the circumstances under which employeesbecome eligible to receive benefits. On December 8, 2015, we amended the Plans to change the calculation for determining the payouts at the time of a Separationof Service under the Plans. None of the amendments materially increase the benefits, grants or awards issuable under the Plans. We recognized expense of $2.7million , $3.1 million , and $3.0 million in 2017 , 2016 , and 2015 , respectively, for benefits associated with anticipated payments from these separation plans.We have entered into key employee change of control contracts with three of our current executive officers. These severance contracts have an initial three -year term that is automatically extended for one year on each anniversary, unless a notice not to extend is given by us. If a change of control of the company, asdefined in the contracts, occurs during the term of the severance contract, then the contract becomes operative for a fixed three -year period. The severancecontracts generally provide that the executive’s terms and conditions for employment (including position, work location, compensation, and benefits) will not beadversely changed during the three -year period after a change of control. If the executive’s employment is terminated (other than for cause, death, or disability),the executive terminates for good reason during such three -year period, or the executive terminates employment for any reason during the 30 -day periodfollowing the first anniversary of the change of control, and on certain terminations prior to a change of control or in connection with or in anticipation of a changeof control, the executive is generally entitled to receive, in addition to certain other benefits, any earned but unpaid compensation; up to 2.9 times the executive’sbase salary plus annual bonus (based on historic annual bonus); and the company matching contributions that would have been made had the executive continuedto participate in the company’s 401(k) plan for up to an additional three years.The severance contract provides that the executive is entitled to receive a payment in an amount sufficient to make the executive whole for any excise tax onexcess parachute payments imposed under Section 4999 of the Code. As a condition to receipt of these severance benefits, the executive must remain in the employof the company prior to change of control and render services commensurate with his position.96Table of ContentsUNIT CORPORATION AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)NOTE 10 – TRANSACTIONS WITH RELATED PARTIESUnit Petroleum Company serves as the general partner of 13 oil and gas limited partnerships (the employee partnerships) which were formed to allow certainof our qualified employees and our directors to participate in Unit Petroleum’s oil and gas exploration and production operations. Employee partnerships wereformed for each year beginning with 1984 and ending with 2011. Previously, there were three non-employee partnerships, one that was formed in 1984 and twoformed in 1986 (investments by third parties). Effective December 31, 2014, the 1984 partnership was dissolved and effective December 31, 2016, the two 1986partnerships were also dissolved.The employee partnerships formed in 1984 through 1990 were consolidated into a single consolidating partnership in 1993 and the employee partnershipsformed in 1991 through 1999 were also consolidated into the consolidating partnership in 2002. The consolidation of the 1991 through the 1999 employeepartnerships was done by the general partners under the authority contained in the respective partnership agreements and did not involve any vote, consent orapproval by the limited partners. The employee partnerships have each had a set percentage (ranging from 1% to 15% ) of our interest in most of the oil and naturalgas wells we drill or acquire for our own account during the particular year for which the partnership was formed. The total interest the employees have in our oiland natural gas wells by participating in these partnerships does not exceed one percent.Amounts received in the years ended December 31, from both public and private Partnerships for which Unit is a general partner are as follows: 2017 2016 2015 (In thousands)Well supervision and other fees$172 $254 $423General and administrative expense reimbursement— 6 18Related party transactions for contract drilling and well supervision fees are the related party’s share of such costs. These costs are billed to related parties onthe same basis as billings to unrelated parties for such services. General and administrative reimbursements are both direct general and administrative expenseincurred on the related party’s behalf and indirect expenses allocated to the related parties. Such allocations are based on the related party’s level of activity and areconsidered by management to be reasonable.As of December 31, 2016, John Nikkel retired as director and chairman of Unit's board and is no longer considered a related party. As of 2016, Mr. Nikkelwas a 25.8% owner of Rampart Holdings, Inc. which owned 100% of Toklan Oil and Gas Company (Toklan), an oil and gas exploration and production companylocated in Tulsa, Oklahoma. Mr. Nikkel's son, Robert Nikkel is Toklan's President, and he owned 20.0% of the company. In 2015, there was one well drilled forToklan with no activity in 2016. Under its usual standard dayrate contract terms available generally to all similarly-situated customers at that time and in the samegeneral drilling area, the Company recognized revenue from Toklan of approximately $0.5 million in 2015. During 2015, we received payments of $0.9 millionwith no accounts receivable balance at December 31, 2015. There were no material revenues in 2016. There were no material royalties to disclose for 2015 or2016. Also in 2015, Toklan paid $0.5 million for the North Custer Gathering System, an inactive (since 2009) gathering system owned by our mid-stream segment.We determined that the capital required to re-activate that system would not provide adequate returns based on future cash flow potential. Toklan operates theNorth Custer Gathering System under its affiliate, West Thomas Field Services, LLC (West Thomas), a company in which Mr. John Nikkel held an approximate25.0% ownership interest and in which Mr. Robert Nikkel held ownership interest of approximately 20.0% . West Thomas entered into a gas purchase agreementwith our exploration and production segment in November of 2015. Payments from West Thomas under that contract amounted to $0.4 million and $0.1 millionfor 2016 and 2015 volumes purchased, respectively. Additionally, on March 10, 2016, Mr. Nikkel purchased in the open market $0.4 million in aggregate principalamount of our outstanding 6.625% senior subordinated notes due 2021. The notes pay interest semi-annually in cash in arrears on May 15 and November 15 ofeach year. For 2016, interest payments for May and November were approximately $4,800 and $13,250 , respectively.One of our directors, G. Bailey Peyton IV, also serves as Manager of Peyton Royalties, LP, a family-controlled limited partnership that owns royalty rights inwells in the Texas and Oklahoma Panhandles. The Company in the ordinary course of business, paid royalties or lease bonuses, primarily due to its status assuccessor in interest to prior transactions and as operator of the wells involved and, in some cases, as lessee, with respect to certain wells in which Mr. Peyton,members of Mr. Peyton's97Table of ContentsUNIT CORPORATION AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)family, and Peyton Royalties, LP have an interest. Such payments totaled approximately $0.7 million , $0.5 million , and $0.8 million during 2017, 2016, and 2015,respectively. Our Audit Committee and the board, in accordance with our related party transaction policy, have determined that these arrangements are in the best interestof the Company.NOTE 11 – STOCK-BASED COMPENSATIONFor restricted stock awards, we had: 2017 2016 2015 (In millions)Recognized stock compensation expense$13.3 $9.6 $15.3Capitalized stock compensation cost for our oil and natural gas properties1.8 2.1 3.5Tax benefit on stock based compensation5.0 3.6 5.8The remaining unrecognized compensation cost related to unvested awards at December 31, 2017 is approximately $12.8 million of which $1.3 million isanticipated to be capitalized. The weighted average period of time over which this cost will be recognized is 0.7 of a year.The Second Amended and Restated Unit Corporation Stock and Incentive Compensation Plan effective May 6, 2015 (the amended plan) allows us to grantstock-based and cash-based compensation to our employees (including employees of subsidiaries) and to non-employee directors. A total of 7,230,000 shares ofthe company's common stock is authorized for issuance to eligible participants under the amended plan with 2.0 million shares being the maximum number ofshares that can be issued as “incentive stock options.” Awards under this plan may be granted in any one or a combination of the following:•incentive stock options under Section 422 of the Internal Revenue Code;•non-qualified stock options;•performance shares;•performance units;•restricted stock;•restricted stock units;•stock appreciation rights;•cash based awards; and•other stock-based awards.This plan also contains various limits as to the amount of awards that can be given to an employee in any fiscal year. All awards are generally subject to theminimum vesting periods, as determined by our Compensation Committee and included in the award agreement.Expected volatilities are based on the historical volatility of our stock. We use historical data to estimate option exercise and termination rates within themodel and aggregate groups that have similar historical exercise behavior for valuation purposes. To date, we have not paid dividends on our stock. The risk freeinterest rate is computed from the United States Treasury Strips rate using the term over which it is anticipated the grant will be exercised.98Table of ContentsUNIT CORPORATION AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)SARsActivity pertaining to SARs granted under the amended plan is as follows: Number ofShares WeightedAveragePriceOutstanding at January 1, 2015131,770 $46.60Granted— —Exercised— —Forfeited— —Outstanding at December 31, 2015131,770 46.60Granted— —Exercised— —Forfeited(40,515) 51.76Outstanding at December 31, 201691,255 44.31Granted— —Exercised— —Forfeited(91,255) 44.31Outstanding at December 31, 2017— $—There were no SARs granted or vested during 2017 , 2016 , or 2015 . There were no SARs exercised in 2017 . The SARs expired after 10 years from thedate of the grant, and there were no outstanding shares at December 31, 2017 . 99Table of ContentsUNIT CORPORATION AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)Restricted StockActivity pertaining to restricted stock awards granted under the amended plan is as follows:EmployeesNumber of TimeVested Shares Number ofPerformance VestedShares Total Number ofShares WeightedAveragePriceNonvested at January 1, 2015724,766 175,520 900,286 $50.81Granted576,361 148,081 724,442 34.06Vested(343,657) (39,245) (382,902) 49.69Forfeited(20,808) (7,196) (28,004) 45.33Nonvested at December 31, 2015936,662 277,160 1,213,822 41.29Granted494,078 152,373 646,451 5.62Vested(425,195) — (425,195) 43.47Forfeited(75,808) (57,405) (133,213) 36.87Nonvested at December 31, 2016929,737 372,128 1,301,865 23.32Granted485,799 173,373 659,172 26.07Vested(455,570) (62,119) (517,689) 29.87Forfeited(44,408) (34,953) (79,361) 38.87Nonvested at December 31, 2017915,558 448,429 1,363,987 $21.25Non-Employee DirectorsNumber ofShares WeightedAveragePriceNonvested at January 1, 201535,136 $50.08Granted25,848 34.04Vested(18,920) 46.51Forfeited— —Nonvested at December 31, 201542,064 $41.83Granted90,000 12.02Vested(20,248) 43.46Forfeited— —Nonvested at December 31, 2016111,816 $17.21Granted49,104 17.92Vested(43,206) 21.24Forfeited— —Nonvested at December 31, 2017117,714 $16.03The time vested restricted stock awards granted are being recognized over a three year vesting period. During 2016, there were two different performancevested restricted stock awards granted to certain executive officers. The first will cliff vest three years from the grant date based on the company's achievement ofcertain stock performance measures at the end of the term and will range from 0% to 200% of the restricted shares granted as performance shares. The second willvest, one-third each year, over a three year vesting period based on the company's achievement of cash flow to total assets (CFTA) performance measurement eachyear and will range from 0% to 200% . Based on a probability assessment of the selected performance criteria at December 31, 2017, the participants are estimatedto receive 82% of the 2017, 159% of the 2016, and 100% of the 2015 performance based shares. The CFTA performance measurement at December 31, 2017 forthe one-third vesting in 2018 was assessed to vest at 131% . The CFTA performance measurement for future years was assessed to vest at target or 100% .The fair value of the restricted stock granted in 2017 , 2016 , and 2015 at the grant date was $17.4 million , $4.5 million , and $24.5 million , respectively.The aggregate intrinsic value of the 560,895 shares of restricted stock that vested in 2017 on100Table of ContentsUNIT CORPORATION AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)their vesting date was $12.3 million . The aggregate intrinsic value of the 1,481,701 shares of restricted stock outstanding subject to vesting at December 31, 2017was $32.6 million with a weighted average remaining life of 0.9 of a year.Employee Stock Option PlanThe Stock Option Plan, provided the granting of options for up to 2,700,000 shares of common stock to officers and employees. The option plan permittedthe issuance of qualified or nonqualified stock options. Options granted typically became exercisable at the rate of 20% per year one year after being granted andexpire after 10 years from the original grant date. The exercise price for options granted under this plan was the fair market value of the common stock on the dateof the grant. In 2006, as a result of the approval of the adoption of the Unit Corporation Stock and Incentive Compensation Plan, no further awards were madeunder this plan. During 2015, the remaining options expired. Activity pertaining to the Stock Option Plan is as follows: Number ofShares WeightedAverageExercisePriceOutstanding at January 1, 20159,500 $37.69Granted— —Exercised— —Forfeited(9,500) 37.69Outstanding at December 31, 2015— —Granted— —Exercised— —Forfeited— —Outstanding at December 31, 2016— —Granted— —Exercised— —Forfeited— —Outstanding at December 31, 2017— $—As of December 31, 2015, there were no further options outstanding or exercisable in this plan.Non-Employee Directors' Stock Option PlanUnder the Unit Corporation 2000 Non-Employee Directors’ Stock Option Plan, on the first business day following each annual meeting of shareholders, eachperson who was then a member of our Board of Directors and who was not then an employee of the company or any of its subsidiaries was granted an option topurchase 3,500 shares of common stock. The option price for each stock option was the fair market value of the common stock on the date the stock options weregranted. The term of each option is 10 years and cannot be increased and no stock options were to be exercised during the first six months of its term except in caseof death. On May 2, 2012, our stockholders approved the amended plan which succeeds this plan, the remaining available shares were transferred over to the newplan and no further awards were made under the non-employee director option plan. 101Table of ContentsUNIT CORPORATION AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)Activity pertaining to the Directors’ Plan is as follows: Number ofShares WeightedAverageExercisePriceOutstanding at January 1, 2015150,500 $54.18Granted— —Exercised— —Forfeited(21,000) 54.35Outstanding at December 31, 2015129,500 54.15Granted— —Exercised— —Forfeited(21,000) 62.40Outstanding at December 31, 2016108,500 52.56Granted— —Exercised— —Forfeited(21,000) 57.63Outstanding at December 31, 201787,500 $51.34There were no options exercised in 2017 . Outstanding and Exercisable Options at December 31, 2017Weighted Average Exercise PriceNumber of Shares Weighted AverageRemaining Contractual Life Weighted Average Exercise Price$31.30 - $41.2138,500 1.9 years $37.58$53.81 - $73.2649,000 2.1 years $62.15There was no aggregate intrinsic value of the shares outstanding subject to options at December 31, 2017 . The remaining weighted average remainingcontractual term is 2.0 years .NOTE 12 – DERIVATIVESCommodity DerivativesWe have entered into various types of derivative transactions covering some of our projected natural gas, NGLs, and oil production. These transactions areintended to reduce our exposure to market price volatility by setting the price(s) we will receive for that production. Our decisions on the price(s), type, andquantity of our production subject to a derivative contract are based, in part, on our view of current and future market conditions. As of December 31, 2017 , ourderivative transactions consisted of the following types of hedges:•Swaps. We receive or pay a fixed price for the commodity and pay or receive a floating market price to the counterparty. The fixed-price payment andthe floating-price payment are netted, resulting in a net amount due to or from the counterparty.•Basis Swaps. We receive or pay the NYMEX settlement value plus or minus a fixed delivery point price for the commodity and pay or receive thepublished index price at the specified delivery point. We use basis swaps to hedge the price risk between NYMEX and its physical delivery points.102Table of ContentsUNIT CORPORATION AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)•Collars. A collar contains a fixed floor price (put) and a ceiling price (call). If the market price exceeds the call strike price or falls below the put strikeprice, we receive the fixed price and pay the market price. If the market price is between the call and the put strike price, no payments are due fromeither party.•Three-way collars. A three-way collar contains a fixed floor price (long put), fixed subfloor price (short put) and a fixed ceiling price (short call). If themarket price exceeds the ceiling strike price, we receive the ceiling strike price and pay the market price. If the market price is between the ceiling andthe floor strike price, no payments are due from either party. If the market price is below the floor price but above the subfloor price, we receive the floorstrike price and pay the market price. If the market price is below the subfloor price, we receive the market price plus the difference between the floorand subfloor strike prices and pay the market price. We have documented policies and procedures to monitor and control the use of derivative instruments. We do not engage in derivative transactions forspeculative purposes. All derivatives are recognized on the balance sheet and measured at fair value. Any changes in our derivatives' fair value occurring beforetheir maturity (i.e., temporary fluctuations in value) are reported in gain (loss) on derivatives in our Consolidated Statements of Operations.At December 31, 2017 , the following non-designated hedges were outstanding:Term Commodity Contracted Volume Weighted Average Fixed Price for Swaps Contracted MarketJan’18 – Dec’18 Natural gas – swap 20,000 MMBtu/day $3.013 IF – NYMEX (HH)Apr'18 – Oct'18 Natural gas – swap 10,000 MMBtu/day $2.990 IF – NYMEX (HH)Jan’18 – Mar'18 Natural gas – basis swap 10,000 MMBtu/day $(0.208) IF – NYMEX (HH)Nov’18 – Dec'18 Natural gas – basis swap 10,000 MMBtu/day $(0.208) IF – NYMEX (HH)Jan’18 – Mar'18 Natural gas – three-way collar 60,000 MMBtu/day $3.29 - $2.63 - $4.07 IF – NYMEX (HH)Apr’18 – Dec'18 Natural gas – three-way collar 20,000 MMBtu/day $3.00 - $2.50 - $3.51 IF – NYMEX (HH)Jan’18 – Dec'18 Crude oil – swap 3,000 Bbl/day $51.36 WTI – NYMEXJan’18 – Mar'18 Crude oil – collar 500 Bbl/day $55.00 - $59.50 WTI – NYMEXJan’18 – Dec'18 Crude oil – three-way collar 2,000 Bbl/day $47.50 - $37.50 - $56.08 WTI – NYMEXApr’18 – Sep'18 Liquids (Propane) – swap 1,000 Bbl/day $31.16 MONT BELVIEUAfter December 31, 2017 , the following non-designated hedges were entered into:Term Commodity Contracted Volume Weighted Average Fixed Price for Swaps Contracted MarketApr’18 – Sep'18 Natural gas – swap 10,000 MMBtu/day $2.925 IF – NYMEX (HH)Apr’18 – Sep'18 Natural gas – collar 30,000 MMBtu/day $2.67 - $2.97 IF – NYMEX (HH)Feb’18 – Dec'18 Natural gas – basis swap 10,000 MMBtu/day $(0.678) PEPLFeb’18 – Dec'18 Natural gas – basis swap 10,000 MMBtu/day $(0.568) NGPL MIDCONApr’18 – Oct'18 Natural gas – basis swap 10,000 MMBtu/day $(0.190) NGPL TEXOKJan'19 – Dec'19 Natural gas – basis swap 10,000 MMBtu/day $(0.728) PEPLJan'19 – Dec'19 Natural gas – basis swap 10,000 MMBtu/day $(0.625) NGPL MIDCONJan'19 – Dec'19 Natural gas – basis swap 20,000 MMBtu/day $(0.273) NGPL TEXOKJan'20 – Dec'20 Natural gas – basis swap 20,000 MMBtu/day $(0.280) NGPL TEXOKApr'18 – Dec'18 Crude oil – swap 1,000 Bbl/day $60.00 WTI – NYMEXApr’18 – Sep'18 Liquids – swap 500 Bbl/day $34.10 MONT BELVIEU 103Table of ContentsUNIT CORPORATION AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)The following tables present the fair values and locations of the derivative transactions recorded in our Consolidated Balance Sheets at December 31: Derivative AssetsFair Value Balance Sheet Location 2017 2016 (In thousands)Commodity derivatives: Current Current derivative assets $721 $—Long-term Non-current derivative assets — 377Total derivative assets $721 $377 Derivative LiabilitiesFair Value Balance Sheet Location 2017 2016 (In thousands)Commodity derivatives: Current Current derivative liabilities $7,763 $21,564Long-term Non-current derivative liabilities — 415Total derivative liabilities $7,763 $21,979If a legal right of set-off exists, we net the value of the derivative transactions we have with the same counterparty in our Consolidated Balance Sheets.Effect of derivative instruments on the Consolidated Statements of Operations for the year ended December 31:Derivatives Instruments Location of Gain or (Loss)Recognized in Income onDerivative Amount of Gain or (Loss)Recognized in Income on Derivative 2017 2016 (In thousands)Commodity derivatives Gain (loss) on derivatives (1) $14,732 $(22,813)Total $14,732 $(22,813)_________________________(1)Amount settled during the period are gains of $173 and $9,658 , respectively.104Table of ContentsUNIT CORPORATION AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)NOTE 13 – FAIR VALUE MEASUREMENTSThe estimated fair value of our available-for-sale securities, reflected on our Unaudited Condensed Consolidated Balance Sheets as Non-current other assets,is based on market quotes. The following is a summary of available-for-sale securities: Cost Gross UnrealizedGains Gross UnrealizedLosses Estimated Fair Value (In thousands)Equity Securities: December 31, 2017 $830 $102 $— $932December 31, 2016 $— $— $— $—During the second quarter of 2017, we received available-for-sale securities for early termination fees associated with a long-term drilling contract. We willevaluate the marketable equity securities to determine if any decline in fair value below cost is other-than-temporary. If a decline in fair value below cost isdetermined to be other-than-temporary, an impairment charge will be recorded and a new cost basis established. We will review several factors to determinewhether a loss is other-than-temporary. These factors include, but are not limited to, (i) the length of time a security is in an unrealized loss position, (ii) the extentto which fair value is less than cost, (iii) the financial condition and near-term prospects of the issuer, and (iv) our intent and ability to hold the security for a periodof time sufficient to allow for any anticipated recovery in fair value. These securities would be classified as Level 2.Fair value is defined as the amount that would be received from the sale of an asset or paid for the transfer of a liability in an orderly transaction betweenmarket participants (in either case, an exit price). To estimate an exit price, a three-level hierarchy is used prioritizing the valuation techniques used to measure fairvalue into three levels with the highest priority given to Level 1 and the lowest priority given to Level 3. The levels are summarized as follows:•Level 1—unadjusted quoted prices in active markets for identical assets and liabilities.•Level 2—significant observable pricing inputs other than quoted prices included within level 1 that are either directly or indirectly observable as of thereporting date. Essentially, inputs (variables used in the pricing models) that are derived principally from or corroborated by observable market data.•Level 3—generally unobservable inputs which are developed based on the best information available and may include our own internal data.The inputs available to us determine the valuation technique we use to measure the fair values of our financial instruments.The following tables set forth our recurring fair value measurements: December 31, 2017 Level 2 Level 3 Effect of Netting Total (In thousands)Financial assets (liabilities): Commodity derivatives: Assets$2,137 $3,344 $(4,760) $721Liabilities(8,973) (3,550) 4,760 (7,763) $(6,836) $(206) $— $(7,042)105Table of ContentsUNIT CORPORATION AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued) December 31, 2016 Level 2 Level 3 Effect of Netting Total (In thousands)Financial assets (liabilities): Commodity derivatives: Assets$878 $43 $(544) $377Liabilities(15,358) (7,165) 544 (21,979) $(14,480) $(7,122) $— $(21,602)All of our counterparties are subject to master netting arrangements. If a legal right of set-off exists, we net the value of the derivative transactions we havewith the same counterparty. We are not required to post any cash collateral with our counterparties and no collateral has been posted as of December 31, 2017 .The following methods and assumptions were used to estimate the fair values of the assets and liabilities in the table above. There were no transfers betweenLevel 2 and Level 3 financial assets (liabilities).Level 2 Fair Value MeasurementsCommodity Derivatives . We measure the fair values of our crude oil and natural gas swaps using estimated internal discounted cash flow calculations basedon the NYMEX futures index. Level 3 Fair Value MeasurementsCommodity Derivatives . The fair values of our natural gas and crude oil collars are estimated using internal discounted cash flow calculations based onforward price curves, quotes obtained from brokers for contracts with similar terms, or quotes obtained from counterparties to the agreements.The following tables are reconciliations of our level 3 fair value measurements: Net Derivatives For the Year Ended, December 31, 2017 December 31, 2016 (In thousands)Beginning of period$(7,122) $9,094Total gains or losses: Included in earnings (1)7,791 (9,042)Settlements(875) (7,174)End of period$(206) $(7,122)Total gains (losses) for the period included in earnings attributable to the change in unrealized loss relatingto assets still held at end of period$6,916 $(16,216)_________________________(1)Commodity derivatives are reported in the Consolidated Statements of Operations in gain (loss) on derivatives.106Table of ContentsUNIT CORPORATION AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)The following table provides quantitative information about our Level 3 unobservable inputs at December 31, 2017 :Commodity (1)Fair ValueValuation TechniqueUnobservable InputRange (In thousands) Oil collars$(77)Discounted cash flowForward commodity price curve$0.00 - $2.48Oil three-way collar(3,473)Discounted cash flowForward commodity price curve$0.00 - $5.96Natural gas three-way collar3,344Discounted cash flowForward commodity price curve$0.00 - $0.68 _________________________(1)The commodity contracts detailed in this category include non-exchange-traded crude oil collars and crude and natural gas three-way collars that are valued based on NYMEX. Theforward pricing range represents the low and high price expected to be received within the settlement period.Based on our valuation at December 31, 2017 , we determined that the non-performance risk with regard to our counterparties was immaterial.Fair Value of Other Financial InstrumentsThe following disclosure of the estimated fair value of financial instruments is made in accordance with accounting guidance for financial instruments. Wehave determined the estimated fair values by using available market information and valuation methodologies. Considerable judgment is required in interpretingmarket data to develop the estimates of fair value. The use of different market assumptions or valuation methodologies may have a material effect on the estimatedfair value amounts.At December 31, 2017 , the carrying values on the consolidated balance sheets for cash and cash equivalents (classified as Level 1), accounts receivable,accounts payable, other current assets, and current liabilities approximate their fair value because of their short term nature.Based on the borrowing rates currently available to us for credit agreement debt with similar terms and maturities and also considering the risk of our non-performance, long-term debt under our credit agreement at December 31, 2017 approximates its fair value. This debt would be classified as Level 2.The carrying amounts of long-term debt, net of unamortized discount and debt issuance costs, associated with the Notes reported in the Consolidated BalanceSheets at December 31, 2017 and December 31, 2016 were $642.3 million and $640.1 million , respectively. We estimate the fair value of these Notes usingquoted marked prices at December 31, 2017 and December 31, 2016 were $649.7 million and $649.9 million , respectively. These Notes would be classified asLevel 2.Fair Value of Non-Financial InstrumentsThe initial measurement of AROs at fair value is calculated using discounted cash flow techniques and based on internal estimates of future retirement costsassociated with property, plant, and equipment. Significant Level 3 inputs used in the calculation of AROs include plugging costs and remaining reserve lives. Areconciliation of the Company’s AROs is presented in Note 7 – Asset Retirement Obligations.Non-recurring fair value measurements are also applied, when applicable, to determine the fair value of our long-lived assets and goodwill. During 2016 and2015, we recorded non-cash impairment charges discussed further in Note 2 – Summary of Significant Accounting Policies. The valuation of these assets requiresthe use of significant unobservable inputs classified as Level 3. NOTE 14 – COMMITMENTS AND CONTINGENCIESWe lease office space or yards in Edmond and Oklahoma City, Oklahoma; Houston, Texas; Englewood, Colorado; Pinedale, Wyoming; and Canonsburg,Pennsylvania under the terms of operating leases expiring through December 2021 . Additionally, we have several compressor rentals, equipment leases, and leasespace on short-term commitments to stack excess drilling rig equipment and production inventory. Future minimum rental payments under the terms of the leasesare approximately $2.7 million , $0.6 million , $0.4 million , and $0.1 million in 2018 through 2021, respectively. Total rent expense incurred was $8.8 million ,$11.1 million , and $12.9 million in 2017 , 2016 , and 2015 , respectively.107Table of ContentsUNIT CORPORATION AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)During 2014, our mid-stream segment entered into capital lease agreements for twenty compressors with initial terms of seven years. Future capital leasepayments under the terms are approximately $6.2 million each year through 2020 and approximately $3.8 million in 2021. Total maintenance and interestremaining related to these leases are $5.9 million and $1.2 million , respectively at December 31, 2017 . Annual payments, net of maintenance and interest, average$4.2 million annually through 2021 . At the end of the term, our mid-stream segment has the option to purchase the assets at 10% of the fair market value of theassets at that time.The employee oil and gas limited partnerships require, on the election of a limited partner, that we repurchase the limited partner’s interest at amounts to bedetermined by appraisal in the future. These repurchases in any one year are limited to 20% of the units outstanding. We made repurchases of approximately$2,900 , $5,000 , $118,000 in 2017 , 2016 , and 2015 , respectively.We manage our exposure to environmental liabilities on properties to be acquired by identifying existing problems and assessing the potential liability. Wealso conduct periodic reviews, on a company-wide basis, to identify changes in our environmental risk profile. These reviews evaluate whether there is a probableliability, its amount, and the likelihood that the liability will be incurred. The amount of any potential liability is determined by considering, among other matters,incremental direct costs of any likely remediation and the proportionate cost of employees who are expected to devote a significant amount of time directly to anypossible remediation effort. As it relates to evaluations of purchased properties, depending on the extent of an identified environmental problem, we may exclude aproperty from the acquisition, require the seller to remediate the property to our satisfaction, or agree to assume liability for the remediation of the property.We have not historically experienced any environmental liability while being a contract driller since the greatest portion of risk is borne by the operator. Anyliabilities we have incurred have been small and have been resolved while the drilling rig is on the location and the cost has been included in the direct cost ofdrilling the well.For 2018, we have committed to purchase approximately $3.9 million of new drilling rig components.We are a party to various litigation matters and claims that have arisen in the normal course of our operations. While the results of litigation and claimscannot be predicted with certainty, we believe the reasonably possible losses from such matter, individually and in the aggregate, are not material. Additionally, webelieve the probable final outcome of such matters will not have a material adverse effect on our results of operations, financial position, or cash flows.NOTE 15 – EQUITYAt-the-Market (ATM) Common Stock Program On April 4, 2017, we entered into a Distribution Agreement (the Agreement) with a sales agent, under which we may offer and sell, from time to time,through the sales agent shares of our common stock, par value $0.20 per share (the Shares), up to an aggregate offering price of $100.0 million . We intend to usethe net proceeds from these sales to fund (or offset costs of) acquisitions, future capital expenditures, repay amounts outstanding under our revolving credit facility,and general corporate purposes. Under the Agreement, the sales agent may sell the Shares by methods deemed to be an “at-the-market” offering as defined in Rule 415 promulgated under theSecurities Act of 1933, as amended, including sales made directly on the NYSE, on any other existing trading market for the Shares or to or through a marketmaker. In addition, under the Agreement, the sales agent may sell the Shares by any other method permitted by law, including in privately negotiated transactions.Subject to the terms and conditions of the Agreement, the sales agent will use commercially reasonable efforts, consistent with its normal trading and salespractices and applicable state and federal law, rules and regulations and the rules of the NYSE, to sell the Shares from time to time, based on our instructions(including any price, time or size limits or other customary parameters or conditions that we may impose). We are not obligated to make any sales of the Shares under the Agreement. The offering of Shares under the Agreement will terminate on the earlier of(1) the sale of all of the Shares subject to the Agreement or (2) the termination of the Agreement by the sales agent or us. We will pay the sales agent a commissionof 2.0% of the gross sales price per share sold and have agreed to provide the sales agent with customary indemnification and contribution rights. 108Table of ContentsUNIT CORPORATION AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)As of December 31, 2017 , we sold 787,547 shares of our common stock resulting in net proceeds of approximately $18.6 million . No shares were sold inthe fourth quarter of 2017.Accumulated Other Comprehensive IncomeComponents of accumulated other comprehensive income were as follows for the years ended December 31: 2017 2016 2015 (In thousands)Unrealized appreciation on securities, before tax$102 $— $—Tax expense(39) — —Unrealized appreciation on securities, net of tax$63 $— $—Changes in accumulated other comprehensive income by component, net of tax, for the years ended December 31 are as follows: Net Gains on Equity Securities 2017 2016 2015 (In thousands)Balance at January 1:$— $— $—Unrealized appreciation before reclassifications63 — —Amounts reclassified from accumulated other comprehensive income— — —Net current-period other comprehensive income63 — —Balance at December 31:$63 $— $—NOTE 16 – INDUSTRY SEGMENT INFORMATIONWe have three main business segments offering different products and services:•Oil and natural gas,•Contract drilling, and•Mid-stream The oil and natural gas segment is engaged in the development, acquisition, and production of oil, NGLs, and natural gas properties. The contract drillingsegment is engaged in the land contract drilling of oil and natural gas wells and the mid-stream segment is engaged in the buying, selling, gathering, processing,and treating of natural gas and NGLs.We evaluate each segment’s performance based on its operating income, which is defined as operating revenues less operating expenses and depreciation,depletion, amortization, and impairment. Our oil and natural gas production outside the United States is not significant.109Table of ContentsUNIT CORPORATION AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)The following table provides certain information about the operations of each of our segments: Year Ended December 31, 2017 Oil and NaturalGas Contract Drilling Mid-stream Other Eliminations TotalConsolidated (In thousands)Revenues: Oil and natural gas $357,744 $— $— $— $— $357,744Contract drilling — 188,172 — — (13,452) 174,720Gas gathering and processing — — 277,049 — (69,873) 207,176Total revenues 357,744 188,172 277,049 — (83,325) 739,640Expenses: Operating costs: Oil and natural gas 135,532 — — — (4,743) 130,789Contract drilling — 134,432 — — (11,832) 122,600Gas gathering and processing — — 220,613 — (65,130) 155,483Total operating costs 135,532 134,432 220,613 — (81,705) 408,872Depreciation, depletion, and amortization 101,911 56,370 43,499 7,477 — 209,257Total expenses 237,443 190,802 264,112 7,477 (81,705) 618,129Total operating income (loss) (1) 120,301 (2,630) 12,937 (7,477) (1,620) General and administrative expense — — — (38,087) — (38,087)Gain (loss) on disposition of assets 228 (776) 25 850 — 327Gain on derivatives — — — 14,732 — 14,732Interest expense, net — — — (38,334) — (38,334)Other — — — 21 — 21Income (loss) before income taxes $120,529 $(3,406) $12,962 $(68,295) $(1,620) $60,170 Identifiable assets: Oil and natural gas (2) $1,127,900 $— $— $— $— $1,127,900Contract drilling — 933,063 — — — 933,063Gas gathering and processing — — 438,571 — — 438,571Total identifiable assets (3) 1,127,900 933,063 438,571 — — 2,499,534Corporate land and building — — — 56,854 — 56,854Other corporate assets (4) — — — 25,064 — 25,064Total assets $1,127,900 $933,063 $438,571 $81,918 $— $2,581,452 Capital expenditures: $270,443 $36,148 $22,168 $3,521 $— $332,280_______________________ (1)Operating income (loss) is total operating revenues less operating expenses, depreciation, depletion, and amortization and does not include general corporate expenses, gain (loss) ondisposition of assets, gain on derivatives, interest expense, other income, or income taxes.(2)Oil and natural gas assets include oil and natural gas properties, saltwater disposal systems, and other non-full cost pool assets.(3)Identifiable assets are those used in Unit’s operations in each industry segment.(4)Corporate assets are principally cash and cash equivalents, short-term investments, transportation equipment, furniture, and equipment.110Table of ContentsUNIT CORPORATION AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued) Year Ended December 31, 2016 Oil and NaturalGas ContractDrilling Mid-stream Other Eliminations TotalConsolidated (In thousands)Revenues: Oil and natural gas $294,221 $— $— $— $— $294,221Contract drilling — 122,086 — — — 122,086Gas gathering and processing — — 237,785 — (51,915) 185,870Total revenues 294,221 122,086 237,785 — (51,915) 602,177Expenses: Operating costs: Oil and natural gas 126,739 — — — (6,555) 120,184Contract drilling — 88,154 — — — 88,154Gas gathering and processing — — 182,969 — (45,360) 137,609Total operating costs 126,739 88,154 182,969 — (51,915) 345,947Depreciation, depletion and amortization 113,811 46,992 45,715 1,835 — 208,353Impairments (1) 161,563 — — — — 161,563Total expenses 402,113 135,146 228,684 1,835 (51,915) 715,863Total operating income (loss) (2) (107,892) (13,060) 9,101 (1,835) — General and administrative expense — — — (33,337) — (33,337)Gain (loss) on disposition of assets (324) 3,184 (302) (18) — 2,540Loss on derivatives — — — (22,813) — (22,813)Interest expense, net — — — (39,829) — (39,829)Other — — — 307 — 307Income (loss) before income taxes $(108,216) $(9,876) $8,799 $(97,525) $— $(206,818) Identifiable assets: Oil and natural gas (3) $965,159 $— $— $— $— $965,159Contract drilling — 941,676 — — — 941,676Gas gathering and processing — — 461,600 — — 461,600Total identifiable assets (4) 965,159 941,676 461,600 — — 2,368,435Corporate land and building — — — 58,188 — 58,188Other corporate assets (5) — — — 52,680 — 52,680Total assets $965,159 $941,676 $461,600 $110,868 $— $2,479,303 Capital expenditures: $89,562 $19,134 $16,796 $16,663 $— $142,155_______________________ (1)We incurred non-cash ceiling test write-down of our oil and natural gas properties of $161.6 million pre-tax ( $100.6 million , net of tax).(2)Operating income (loss) is total operating revenues less operating expenses, depreciation, depletion, amortization, and impairment and does not include general corporate expenses, gain(loss) on disposition of assets, loss on derivatives, interest expense, other income (loss), or income taxes.(3)Oil and natural gas assets include oil and natural gas properties, saltwater disposal systems, and other non-full cost pool assets.(4)Identifiable assets are those used in Unit’s operations in each industry segment.(5)Corporate assets are principally cash and cash equivalents, short-term investments, transportation equipment, furniture, and equipment.111Table of ContentsUNIT CORPORATION AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued) Year Ended December 31, 2015 Oil and NaturalGas ContractDrilling Mid-stream Other Eliminations TotalConsolidated (In thousands)Revenues: Oil and natural gas $385,774 $— $— $— $— $385,774Contract drilling — 287,767 — — (22,099) 265,668Gas gathering and processing — — 268,012 — (65,223) 202,789Total revenues 385,774 287,767 268,012 — (87,322) 854,231Expenses: Operating costs: Oil and natural gas 170,831 — — — (4,785) 166,046Contract drilling — 174,757 — — (18,349) 156,408Gas gathering and processing — — 221,994 — (60,438) 161,556Total operating costs 170,831 174,757 221,994 — (83,572) 484,010Depreciation, depletion and amortization 251,944 56,135 43,676 987 — 352,742Impairments (1) 1,599,348 8,314 26,966 — — 1,634,628Total expenses 2,022,123 239,206 292,636 987 (83,572) 2,471,380Total operating income (loss) (2) (1,636,349) 48,561 (24,624) (987) (3,750) General and administrative expense — — — (34,358) — (34,358)Gain (loss) on disposition of assets (147) (7,516) 465 (31) — (7,229)Gain on derivatives — — — 26,345 — 26,345Interest expense, net — — — (31,963) — (31,963)Other — — — 45 — 45Income (loss) before income taxes $(1,636,496) $41,045 $(24,159) $(40,949) $(3,750) $(1,664,309) Identifiable assets: Oil and natural gas (3) $1,218,036 $— $— $— $— $1,218,036Contract drilling — 993,015 — — — 993,015Gas gathering and processing — — 478,661 — — 478,661Total identifiable assets (4) 1,218,036 993,015 478,661 — — 2,689,712Corporate land and building — — — 49,890 — 49,890Other corporate assets (5) — — — 60,240 60,240Total assets $1,218,036 $993,015 $478,661 $110,130 $— $2,799,842 Capital expenditures: $267,944 $84,802 $63,476 $38,065 $— $454,287_______________________ (1)We incurred non-cash ceiling test write-down of our oil and natural gas properties of $1.6 billion pre-tax ( $1.0 billion , net of tax). Impairment for contract drilling equipment includes an$8.3 million pre-tax write-down for 30 drilling rigs and other drilling equipment. Impairment for gas gathering and processing systems includes $27.0 million pre-tax write-down for threeof our systems, Bruceton Mills, Midwell, and Spring Creek.(2)Operating income (loss) is total operating revenues less operating expenses, depreciation, depletion, amortization, and impairment and does not include general corporate expenses, gain(loss) on disposition of assets, gain on derivatives, interest expense, other income (loss), or income taxes.(3)Oil and natural gas assets include oil and natural gas properties, saltwater disposal systems, and other non-full cost pool assets.(4)Identifiable assets are those used in Unit’s operations in each industry segment.(5)Corporate assets are principally cash and cash equivalents, short-term investments, transportation equipment, furniture, and equipment.112Table of ContentsUNIT CORPORATION AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)NOTE 17 – SELECTED QUARTERLY FINANCIAL INFORMATIONSummarized unaudited quarterly financial information is as follows: Three Months Ended March 31 June 30 September 30 December 31 (In thousands except per share amounts) 2016 Revenues$136,184 $138,305 $153,408 $174,280 Gross income (loss) (1)$(49,745) $(73,830) $(26,893) $36,782 Net income (loss)$(41,149) $(72,136) $(24,022) $1,683 Net income (loss) per common share: Basic (2)$(0.83) $(1.44) $(0.48) $0.03 Diluted (2)$(0.83) $(1.44) $(0.48) $0.03 2017 Revenues$175,724 $170,581 $188,488 $204,847 Gross income (1)$32,657 $24,462 $27,181 $37,211 Net income$15,929 $9,059 $3,705 $89,155 Net income per common share: Basic$0.32 $0.18 $0.07 $1.74 Diluted (2)$0.31 $0.17 $0.07 $1.71 _________________________(1)Gross income (loss) excludes general and administrative expense, interest expense, (gain) loss on disposition of assets, gain (loss) on derivatives, income taxes, and other income (loss).(2)The earnings (loss) per share for the year's four quarters does not equal annual income (loss) per share.113SUPPLEMENTAL OIL AND GAS DISCLOSURES(UNAUDITED)Our oil and gas operations are substantially located in the United States. The capitalized costs at year end and costs incurred during the year were as follows: 2017 2016 2015 (In thousands)Capitalized costs: Proved properties$5,712,813 $5,446,305 $5,401,618Unproved properties296,764 314,867 337,099 6,009,577 5,761,172 5,738,717Accumulated depreciation, depletion, amortization, and impairment(4,996,696) (4,900,304) (4,631,404)Net capitalized costs$1,012,881 $860,868 $1,107,313Cost incurred: Unproved properties acquired$47,029 $21,675 $41,777Proved properties acquired47,638 564 179Exploration14,811 17,325 19,222Development160,941 80,582 208,845Asset retirement obligation(3,613) (30,906) (5,693)Total costs incurred$266,806 $89,240 $264,330The following table shows a summary of the oil and natural gas property costs not being amortized at December 31, 2017 , by the year in which such costswere incurred: 2017 2016 2015 2014 and Prior Total (In thousands)Unproved properties acquired and wells inprogress$50,447 $22,092 $40,254 $183,971 $296,764Unproved properties not subject to amortization relates to properties which are not individually significant and consist primarily of lease acquisition costs.The evaluation process associated with these properties has not been completed and therefore, the company is unable to estimate when these costs will be includedin the amortization calculation.The results of operations for producing activities are as follows: 2017 2016 2015 (In thousands)Revenues$347,285 $282,742 $371,335Production costs(107,332) (108,822) (152,560)Depreciation, depletion, amortization, and impairment(96,392) (268,901) (1,844,726) 143,561 (94,981) (1,625,951)Income tax (expense) benefit(56,376) 32,696 612,496Results of operations for producing activities (excluding corporate overhead and financingcosts)$87,185 $(62,285) $(1,013,455)114Estimated quantities of proved developed oil, NGLs, and natural gas reserves and changes in net quantities of proved developed and undeveloped oil, NGLs,and natural gas reserves were as follows: OilBbls NGLsBbls Natural GasMcf TotalMBoe (In thousands)2015 Proved developed and undeveloped reserves: Beginning of year22,667 48,529 646,961 179,023Revision of previous estimates (1)(3,954) (9,367) (139,514) (36,573)Extensions and discoveries1,208 1,948 20,974 6,651Infill reserves in existing proved fields670 1,861 22,641 6,304Purchases of minerals in place— — — —Production(3,783) (5,274) (65,546) (19,981)Sales(73) (10) (648) (191)End of year16,735 37,687 484,868 135,233Proved developed reserves: Beginning of year17,448 35,850 500,950 136,790End of year14,679 31,218 416,395 115,296Proved undeveloped reserves: Beginning of year5,219 12,679 146,011 42,233End of year2,056 6,469 68,473 19,9372016 Proved developed and undeveloped reserves: Beginning of year16,735 37,687 484,868 135,233Revision of previous estimates (1)(549) (2,473) (31,670) (8,300)Extensions and discoveries1,816 1,588 13,720 5,690Infill reserves in existing proved fields663 2,724 24,704 7,504Purchases of minerals in place114 43 630 262Production(2,974) (5,014) (55,735) (17,277)Sales(109) (73) (30,938) (5,338)End of year15,696 34,482 405,579 117,774Proved developed reserves: Beginning of year14,679 31,218 416,395 115,296End of year12,724 28,502 347,121 99,079Proved undeveloped reserves: Beginning of year2,056 6,469 68,473 19,937End of year2,972 5,980 58,458 18,6952017 Proved developed and undeveloped reserves: Beginning of year15,696 34,482 405,579 117,774Revision of previous estimates730 4,325 38,330 11,444Extensions and discoveries2,235 4,520 49,321 14,975Infill reserves in existing proved fields1,632 5,779 52,270 16,123Purchases of minerals in place2,019 1,197 15,313 5,768Production(2,715) (4,737) (51,260) (15,996)Sales(84) (80) (903) (314)End of year19,513 45,486 508,650 149,774Proved developed reserves: Beginning of year12,724 28,502 347,121 99,079End of year14,862 33,358 388,446 112,961Proved undeveloped reserves: Beginning of year2,972 5,980 58,458 18,695End of year4,651 12,128 120,204 36,813_________________________(1)Natural gas revisions of previous estimates decreased primarily due to a decline in natural gas prices.115Estimates of oil, NGLs, and natural gas reserves require extensive judgments of reservoir engineering data. Assigning monetary values to such estimatesdoes not reduce the subjectivity and changing nature of such reserve estimates. Indeed the uncertainties inherent in the disclosure are compounded by applyingadditional estimates of the rates and timing of production and the costs that will be incurred in developing and producing the reserves. The information set forth inthis report is, therefore, subjective and, since judgments are involved, may not be comparable to estimates submitted by other oil and natural gas producers. Inaddition, since prices and costs do not remain static, and no price or cost escalations or de-escalations have been considered, the results are not necessarilyindicative of the estimated fair market value of estimated proved reserves, nor of estimated future cash flows.The standardized measure of discounted future net cash flows (SMOG) was calculated using 12-month average prices and year end costs adjusted forpermanent differences that relate to existing proved oil, NGLs, and natural gas reserves. Future income tax expenses consider the Tax Act statutory tax rates.SMOG as of December 31 is as follows: 2017 2016 2015 (In thousands)Future cash flows$3,347,396 $2,030,925 $2,475,898Future production costs(1,308,244) (861,625) (1,017,777)Future development costs(369,560) (173,446) (228,445)Future income tax expenses(234,152) (141,752) (230,544)Future net cash flows1,435,440 854,102 999,13210% annual discount for estimated timing of cash flows(628,270) (335,892) (409,646)Standardized measure of discounted future net cash flows relating to proved oil, NGLs, andnatural gas reserves$807,170 $518,210 $589,486The principal sources of changes in the standardized measure of discounted future net cash flows were as follows: 2017 2016 2015 (In thousands)Sales and transfers of oil and natural gas produced, net of production costs$(239,953) $(173,920) $(218,115)Net changes in prices and production costs236,126 (94,026) (1,356,333)Revisions in quantity estimates and changes in production timing87,239 (51,979) (213,945)Extensions, discoveries, and improved recovery, less related costs102,965 84,738 95,671Changes in estimated future development costs(5,194) 70,976 227,857Previously estimated cost incurred during the period36,044 16,602 59,117Purchases of minerals in place51,686 2,652 —Sales of minerals in place(1,447) (17,248) (3,338)Accretion of discount57,517 69,069 209,979Net change in income taxes(33,389) 44,241 562,838Other—net(2,634) (22,381) (209,989)Net change288,960 (71,276) (846,258)Beginning of year518,210 589,486 1,435,744End of year$807,170 $518,210 $589,486Certain information concerning the assumptions used in computing SMOG and their inherent limitations are discussed below. We believe this information isessential for a proper understanding and assessment of the data presented.The assumptions used to compute SMOG do not necessarily reflect our expectations of actual revenues to be derived from neither those reserves nor theirpresent worth. Assigning monetary values to the reserve quantity estimation process does not reduce the subjective and ever-changing nature of reserve estimates.Additional subjectivity occurs when determining present values because the rate of producing the reserves must be estimated. In addition to difficulty inherent inpredicting the future, variations from the expected production rate could result from factors outside of our control, such as unintentional delays in development,environmental concerns or changes in prices or regulatory controls. Also, the reserve valuation assumes116that all reserves will be disposed of by production. However, other factors such as the sale of reserves in place could affect the amount of cash eventually realized.The December 31, 2017 , future cash flows were computed by applying the unescalated 12-month average prices of $51.34 per barrel for oil, $31.83 perbarrel for NGLs, and $2.98 per Mcf for natural gas (then adjusted for price differentials) relating to proved reserves and to the year-end quantities of those reserves.Future price changes are considered only to the extent provided by contractual arrangements in existence at year-end.Future production and development costs are computed by estimating the expenditures to be incurred in developing and producing the proved oil, NGLs, andnatural gas reserves at the end of the year, based on continuation of existing economic conditions.Future income tax expenses are computed by applying the appropriate year-end statutory tax rates to the future pretax net cash flows relating to proved oil,NGLs, and natural gas reserves less the tax basis of our properties. The future income tax expenses also give effect to permanent differences and tax credits andallowances relating to our proved oil, NGLs, and natural gas reserves.Care should be exercised in the use and interpretation of the above data. As production occurs over the next several years, the results shown may besignificantly different as changes in production performance, petroleum prices and costs are likely to occur.Item 9. Changes in and Disagreements with Accountants on Accounting and Financial DisclosureNone.Item 9A. Controls and Procedures(a)Evaluation of Disclosure Controls and ProceduresWe maintain “disclosure controls and procedures,” as that term is defined in Rule 13a-15(e) and Rule 15d-15(e) under the Securities Exchange Act of 1934(the Exchange Act), that are designed to ensure that information required to be disclosed in reports we file or submit under the Exchange Act is recorded,processed, summarized, and reported within the time periods specified in SEC rules and forms, and that such information is collected and communicated tomanagement, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure. Indesigning and evaluating our disclosure controls and procedures, our management recognized that no matter how well conceived and operated, disclosure controlsand procedures can provide only reasonable, not absolute, assurance that the objectives of the disclosure controls and procedures are met. Our disclosure controlsand procedures have been designed to meet, and our management believes that they meet, reasonable assurance standards. Based on their evaluation as of the endof the period covered by this Annual Report on Form 10-K, our Chief Executive Officer and Chief Financial Officer have concluded that, subject to the limitationsnoted above, the company’s disclosure controls and procedures were effective. (b)Management’s Report on Internal Control Over Financial ReportingOur management is responsible for establishing and maintaining adequate internal control over financial reporting, as defined in Exchange Act Rule 13a-15(f). Our management, including our Chief Executive Officer and Chief Financial Officer, conducted an evaluation of the effectiveness of our internal controlover financial reporting based on the Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the TreadwayCommission (COSO). Based on the results of this evaluation, our management concluded that our internal control over financial reporting was effective as ofDecember 31, 2017 .The effectiveness of the company’s internal control over financial reporting as of December 31, 2017 , has been audited by PricewaterhouseCoopers LLP, anindependent registered public accounting firm, as stated in their report which appears in this report. 117Table of Contents(c)Changes in Internal Control Over Financial ReportingIn January 2017, we implemented a new ERP accounting and reporting system designed to upgrade our technology and improve the timeliness and quality ofour financial and operational information. This new ERP system was not implemented in response to any material weakness in our internal control over financialreporting (ICFR). The implementation of the ERP system has affected the processes that constitute part of our ICFR and requires ongoing testing for effectiveness.The adoption of this new ERP system has not materially affected our ICFR. There were no changes in ICFR during the quarter ended December 31, 2017, thatmaterially affected our ICFR or are reasonably likely to materially affect it.Item 9B. Other InformationNone.PART IIIItem 10. Directors, Executive Officers, and Corporate GovernanceIn accordance with Instruction G(3) of Form 10-K, the information required by this item is incorporated in this report by reference to the Proxy Statement,except for the information regarding our executive officers which is presented below. The Proxy Statement will be filed before our annual shareholders’ meetingscheduled to be held on May 2, 2018.Our Code of Ethics and Business Conduct applies to all directors, officers, and employees, including our Chief Executive Officer, our Chief FinancialOfficer, and our Controller. You can find our Code of Ethics and Business Conduct on our internet website, www.unitcorp.com. We will post any amendments tothe Code of Ethics and Business Conduct, and any waivers that are required to be disclosed by the rules of either the SEC or the NYSE, on our internet website.Because our common stock is listed on the NYSE, our Chief Executive Officer was required to make, and he has made, an annual certification to the NYSEstating that he was not aware of any violation by us of the NYSE corporate governance listing standards. Our Chief Executive Officer made his annual certificationto that effect to the NYSE as of May 5, 2017. In addition, we have filed, as exhibits to this Annual Report on Form 10-K, the certifications of our Chief ExecutiveOfficer and Chief Financial Officer required under Section 302 of the Sarbanes-Oxley Act of 2002 to be filed with the SEC regarding the quality of our publicdisclosure.Executive OfficersThe table below and accompanying text sets forth certain information as of February 13, 2018 concerning each of our executive officers and certain officersof our subsidiaries. There were no arrangements or understandings between any of the officers and any other person(s) under which the officers were elected.118Table of ContentsNAME AGE POSITION HELDLarry D. Pinkston 63 Chief Executive Officer since April 1, 2005, Director since January 15, 2004, President since August 1, 2003, ChiefOperating Officer from February 24, 2004 to August 28, 2017, Vice President and Chief Financial Officer from May 1989to February 24, 2004Mark E. Schell 60 Senior Vice President since December 2002, General Counsel and Corporate Secretary since January 1987David T. Merrill 57 Chief Operating Officer since August 28, 2017, Senior Vice President from May 2, 2012 to November 27, 2017, ChiefFinancial Officer and Treasurer from February 24, 2004 to November 27, 2017, Vice President of Finance from August2003 to February 24, 2004Les Austin 52 Senior Vice President and Chief Financial Officer since November 27, 2017David P. Dunham 38 Senior Vice President of Business Development since August 28, 2017, Vice President of Corporate Planning from January2012 to August 28, 2017, Director of Corporate Planning from November 2007 to January 2012John Cromling 70 Executive Vice President, Unit Drilling Company since April 15, 2005Robert Parks 63 Manager and President, Superior Pipeline Company, L.L.C. since June 1996Frank Young 48 Senior Vice President Exploration and Production Midcontinent of Unit Petroleum Company since 2012, Vice President -Central Division from June 2007, when he joined Unit Company, until 2012.Mr. Pinkston joined the company in December 1981. He had served as Corporate Budget Director and Assistant Controller before being appointed Controllerin February, 1985. In December, 1986 he was elected Treasurer of the company and was elected to the position of Vice President and Chief Financial Officer inMay, 1989. In August, 2003, he was elected to the position of President. He was elected a director of the company by the Board in January, 2004. In February,2004, in addition to his position as President, he was elected to the office of Chief Operating Officer. In April 2005, he also began serving as Chief ExecutiveOfficer. Mr. Pinkston holds the offices of President and Chief Executive Officer. He holds a Bachelor of Science Degree in Accounting from East CentralUniversity of Oklahoma.Mr. Schell joined the company in January 1987, as its Secretary and General Counsel. In 2003, he was promoted to Senior Vice President. From 1979 untiljoining Unit Corporation, Mr. Schell was Counsel, Vice President, and a member of the Board of Directors of C & S Exploration Inc. He received a Bachelor ofScience degree in Political Science from Arizona State University and his Juris Doctorate degree from the University of Tulsa College of Law. He is a member ofthe Oklahoma Bar Association. Mr. Schell is a director of the Oklahoma Oil and Gas Association. In addition, he is the Chairman and a director of the OklahomaInjury Benefit Coalition, an Oklahoma non-profit association advocating for improvements to Oklahoma's Workers' Compensation system. He is also a member ofthe State Chamber of Oklahoma board of directors and serves on the board of advisors for the Greater Oklahoma City Chamber.Mr. Merrill joined the company in August 2003 and served as its Vice President of Finance until February 2004 when he was elected to the position of ChiefFinancial Officer and Treasurer. In May 2012, he was promoted to Senior Vice President, a position he held until November 2017. In August 2017, he waspromoted to Chief Operating Officer. From May 1999 through August 2003, Mr. Merrill served as Senior Vice President, Finance with TV Guide Networks, Inc.From July 1996 through May 1999 he was a Senior Manager with Deloitte & Touche LLP. From July 1994 through July 1996 he was Director of FinancialReporting and Special Projects for MAPCO, Inc. He began his career as an auditor with Deloitte, Haskins & Sells in 1983. Mr. Merrill received a Bachelor ofBusiness Administration Degree in Accounting from the University of Oklahoma and is a Certified Public Accountant.Mr. Austin joined the company in November 2017 as Senior Vice President and Chief Financial Officer of the company. Prior to coming to Unit, he servedas Senior Vice President and Chief Financial Officer of Cypress Energy Partners, L.P.. From 2008 to 2011, he was the Senior Vice President and Chief FinancialOfficer of Ram Energy Resources, Inc. In 2011, he was promoted to Chief Operating Officer where he served until its sale in 2012. Before joining Ram EnergyResources, Inc., Mr. Austin was the Vice President of Finance and Chief Financial Officer of Matrix Service Company. He has also held various managerial andfinancial positions at Flint Energy Construction Co. and Ernst & Young, LLP. Mr. Austin has a bachelor's degree in accounting from Oklahoma State Universityand is a Certified Public Accountant.Mr. Dunham joined the company in November 2007 as its Director of Corporate Planning. He was promoted to Vice President of Corporate Planning inJanuary 2012. In August 2017, he was promoted to Senior Vice President of Business Development. From 2004 to November 2007, Mr. Dunham worked forWilliams Power, serving as Manager of Structured119Table of ContentsProducts. He worked for Leggett & Platt from 2003 to 2004, serving as a Mergers & Acquisitions Analyst. He received his Bachelor of Arts degree in Psychologyfrom Northwestern University, his Master of Science in Finance degree from the University of Tulsa, and his MBA from the Wharton School of the University ofPennsylvania.Mr. Cromling joined Unit Drilling Company in 1997 as a Vice-President and Division Manager. In April 2005, he was promoted to the position of ExecutiveVice-President of Drilling for Unit Drilling Company. In 1980, he formed Cromling Drilling Company which managed and operated drilling rigs until 1987. From1987 to 1997, Cromling Drilling Company provided engineering consulting services and generated and drilled oil and natural gas prospects. Prior to this, he wasemployed by Big Chief Drilling for 11 years and served as Vice-President. Mr. Cromling graduated from the University of Oklahoma with a degree in PetroleumEngineering.Mr. Parks founded Superior Pipeline Company, L.L.C. in 1996. When Superior was acquired by the company in July 2004, he continued with Superior asone of its managers and as its President. From April 1992 through April 1996 Mr. Parks served as Vice-President—Gathering and Processing for Cimarron GasCompanies. From December 1986 through March 1992, he served as Vice-President—Business Development for American Central Gas Companies. Mr. Parksbegan his career as an engineer with Cities Service Company in 1978. He received a Bachelor of Science degree in Chemical Engineering from Rice Universityand his M.B.A. from the University of Texas at Austin.Mr. Young joined Unit Petroleum Company in June 2007 as Vice President - Central Division. In 2012, he was promoted to Senior Vice President ofExploration and Production over Unit’s Midcontinent assets. Before joining Unit, Mr. Young was employed by Anadarko Petroleum Corporation. He began hiscareer with Anadarko in 1991 as a Production Engineer and, in 1994, began working as a Reservoir Engineer. In 1996, he was promoted to a Senior AssetEngineering role responsible for delineation and development of Anadarko’s North African oil fields. In 1999, he was moved into a Senior Completions /Operations Engineering role responsible for development of gas fields in East Texas. In 2000, he was promoted to Division Engineer responsible for operationswithin Anadarko’s Permian Division in West Texas. In 2002, he was promoted to Planning Manager for North America. In 2004, he was promoted to GeneralManager of Central Gulf of Mexico responsible for delineation and development of various Deepwater fields. Mr. Young holds a Bachelor of Science degree inPetroleum Engineering from Texas Tech University and a Master of Business Administration degree from Texas A&M University.Item 11. Executive CompensationIn accordance with Instruction G(3) of Form 10-K, the information required by this Item is incorporated into this report by reference to the Proxy Statement(see Item 10 above).120Table of ContentsItem 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder MattersThe following table provides information for all equity compensation plans as of the fiscal year ended December 31, 2017 , under which our equity securitieswere authorized for issuance:Plan CategoryNumber of Securities to beIssued Upon Exercise ofOutstanding Options,Warrants and Rights(a) Weighted Average Exercise Price of Outstanding Options, Warrants and Rights (b) Number of Securities Remaining Available for Future Issuance UnderEquity Compensation Plans (ExcludingSecurities Reflected inColumn (a)) (c) Equity compensation plans approved by security holders (1)87,500(2) $51.34 3,641,494(3) Equity compensation plans not approved by security holders— — — Total87,500 $51.34 3,641,494 _________________________(1)Shares awarded under all above plans may be newly issued, from our treasury, or acquired in the open market.(2)This number includes 87,500 stock options outstanding under the Non-Employee Directors’ Stock Option Plan.(3)This number reflects the shares available for issuance under the Second Amended and Restated Unit Corporation Stock and Incentive Compensation Plan effective May 6, 2015 (theamended plan). The amended plan allows us to grant stock-based compensation to our employees and non-employee directors. A total of 7,230,000 shares of the company's common stockis authorized for issuance to eligible participants under the amended plan. No more than 2,000,000 of the shares available under the amended plan may be issued as “incentive stockoptions” and all of the shares available under this plan may be issued as restricted stock. In addition, shares related to grants that are forfeited, terminated, canceled, expire unexercised, orsettled in such manner that all or some of the shares are not issued to a participant shall immediately become available for issuance.In accordance with Instruction G(3) of Form 10-K, the information required by this Item is incorporated into this report by reference to the Proxy Statement(see Item 10 above).Item 13. Certain Relationships and Related Transactions, and Director IndependenceIn accordance with Instruction G(3) of Form 10-K, the information required by this Item is incorporated into this report by reference to the Proxy Statement(see Item 10 above).Item 14. Principal Accounting Fees and ServicesIn accordance with Instruction G(3) of Form 10-K, the information required by this Item is incorporated into this report by reference to the Proxy Statement(see Item 10 above).121Table of ContentsPART IVItem 15. Exhibits, Financial Statement Schedules(a) Financial Statements, Schedules and Exhibits:1. Financial Statements: Included in Part II of this report:Report of Independent Registered Public Accounting FirmConsolidated Balance Sheets as of December 31, 2017 and 2016Consolidated Statements of Operations for the years ended December 31, 2017 , 2016 , and 2015Consolidated Statements of Comprehensive Income (Loss) for the years ended December 31, 2017 , 2016 , and 2015Consolidated Statements of Changes in Shareholders’ Equity for the years ended December 31, 2015 , 2016 , and 2017Consolidated Statements of Cash Flows for the years ended December 31, 2017 , 2016 , and 2015Notes to Consolidated Financial Statements2. Financial Statement Schedules: Included in Part IV of this report for the years ended December 31, 2017 , 2016 , and 2015 :Schedule II—Valuation and Qualifying Accounts and ReservesOther schedules are omitted because of the absence of conditions under which they are required or because the required information is included in theconsolidated financial statements or notes thereto.3. Exhibits:The exhibit numbers in the following list correspond to the numbers assigned such exhibits in the Exhibit Table of Item 601 of Regulation S-K.3.1 Restated Certificate of Incorporation of Unit Corporation (incorporated by reference to Exhibit 3.1 of Unit's Form 8-K, dated June 29, 2000). 3.1.2 Certificate of Amendment of Amended and Restated Certificate of Incorporation of the Company (filed as Exhibit 3.1 to Unit’s Form 8-K, datedMay 9, 2006 which is incorporated herein by reference). 3.2 By-laws of Unit Corporation, as amended and restated on June 17, 2014 (filed as Exhibit 3.3 to our Registration Statement on Form S-3 (File No.333-202956), and incorporated by reference herein). 4.1 Form of Common Stock Certificate (filed as Exhibit 4.1 to Unit’s Form S-3 (File No. 333-83551), which is incorporated herein by reference). 4.5 Indenture dated as of May 18, 2011, by and between the Company and Wilmington Trust FSB, as trustee (filed as Exhibit 4.1 to Unit’s Form 8-Kdated May 18, 2011, which is incorporated herein by reference). 4.6 First Supplemental Indenture (including form of note) dated as of May 18, 2011, by and among the Company, as issuer, the SubsidiaryGuarantors (as defined therein), as guarantors and Wilmington Trust FSB as trustee (filed as Exhibit 4.2 to Unit’s Form 8-K dated May 18, 2011,which is incorporated herein by reference). 4.7 Second Supplemental Indenture (including form of note) dated as of January 7, 2013, by and among the Registrant, as issuer, the SubsidiaryGuarantors (as defined therein), as guarantors and Wilmington Trust, National Association as trustee (filed as Exhibit 4.10 to Unit’s Post-Effective Amendment No.1 to the Registration Statement on Form S-3 dated February 16, 2016, which is incorporated herein by reference). 10.1.2* Form of Unit Corporation Restricted Stock Bonus Agreement (filed as Exhibit 10.1 to Unit’s Form 8-K dated December 13, 2005, which isincorporated herein by reference). 10.1.3* Unit Corporation Stock and Incentive Compensation Plan Amended and Restated May 2, 2012 (filed as Exhibit 10 to Unit’s Form 8-K dated May2, 2012, which is incorporated herein by reference). 122Table of Contents10.1.4 Amended and Restated Key Employee Change of Control Contract dated August 19, 2008 (filed as Exhibit 10.1 to Unit’s Form 8-K dated August25, 2008, which is incorporated herein by reference). 10.1.5 Senior Credit Agreement dated September 13, 2011 by and among the Company and the subsidiaries named therein (as borrowers), BOKF, NADBA Bank of Oklahoma, as Administrative Agent, and the institutions named therein (as lenders) (filed as Exhibit 10.1 to Unit’s Form 8-K datedSeptember 13, 2011, which is incorporated herein by reference). 10.1.6 Gas Purchase Agreement dated November 21, 2011 by and between Superior Pipeline Company, L.L.C. and Sullivan and Company, L.L.C. (filedas Exhibit 10.1 to Unit’s Form 8-K dated November 21, 2011, which is incorporated herein by reference). 10.1.7 First Amendment and Consent, dated September 5, 2012, to the Senior Credit Agreement by and among the Company and the subsidiaries namedtherein (as borrowers), BOKF, NA DBA Bank of Oklahoma, as Administrative Agent, and the institutions named therein (as lenders) (filed asexhibit 10.1 to Unit's Form 8-K dated September 5, 2012, which is incorporated herein by reference). 10.1.8* Second Amended and Restated Unit Corporation Stock and Incentive Compensation Plan dated May 6, 2015 (filed as Exhibit 10 to Unit's Form 8-K dated May 8, 2015, which is incorporated herein by reference). 10.1.9 Amendment Number 1 to the Second Amended and Restated Unit Corporation Stock and Incentive Compensation Plan (filed as Exhibit 10.1 toUnit's Form 8-K dated May 4, 2017, which is incorporated herein by reference). 10.1.10 Second Amendment and Consent, dated April 10, 2015, to the Senior Credit Agreement by and among the Company and the subsidiaries namedtherein (as borrowers), BOKF, NA DBA Bank of Oklahoma, as Administrative Agent, and the institutions named therein (as lenders) (filed asexhibit 10.1 to Unit's Form 8-K dated April 10, 2015, which is incorporated herein by reference). 10.2.1 Unit 1979 Oil and Gas Program Agreement of Limited Partnership (filed as Exhibit I to Unit Drilling and Exploration Company’s RegistrationStatement on Form S-1 as S.E.C. File No. 2-66347, which is incorporated herein by reference). 10.2.3* Unit’s Amended and Restated Stock Option Plan (filed as an Exhibit to Unit’s Registration Statement on Form S-8 as S.E.C. File No’s. 33-19652,33-44103, 33-64323 and 333-39584 which is incorporated herein by reference). 10.2.4* Unit Corporation Non-Employee Directors’ Stock Option Plan (filed as an Exhibit to Form S-8 as S.E.C. File No. 33-49724 and File No. 333-166605, which are incorporated herein by reference). 10.2.5* Unit Corporation Employees’ Thrift Plan (filed as an Exhibit to Form S-8 as S.E.C. File No. 33-53542, which is incorporated herein byreference). 10.2.6 Unit Consolidated Employee Oil and Gas Limited Partnership Agreement (filed as an Exhibit to Unit’s Annual Report under cover of Form 10-Kfor the year ended December 31, 1993, which is incorporated herein by reference). 10.2.7* Unit Corporation Salary Deferral Plan (filed as an Exhibit to Unit’s Annual Report under cover of Form 10-K for the year ended December 31,1993, which is incorporated herein by reference). 10.2.8* Unit Corporation Separation Benefit Plan for Senior Management as amended (filed as an Exhibit 10.1 to Unit’s Form 8-K dated December 20,2004). 10.2.9* Unit Corporation Special Separation Benefit Plan as amended (filed as Exhibit 10.3 to Unit’s Form 8-K dated December 20, 2004). 10.2.10 Unit 2000 Employee Oil and Gas Limited Partnership Agreement of Limited Partnership (incorporated by reference to Exhibit 10 of Unit’sAnnual Report on Form 10-K for the year ended December 31, 1999). 10.2.11* Unit Corporation 2000 Non-Employee Directors’ Stock Option Plan (incorporated by reference to Exhibit 99 of Unit's Form S-8 as S.E.C. FileNo. 333-38166). 10.2.12 Unit 2001 Employee Oil and Gas Limited Partnership Agreement of Limited Partnership (filed as an Exhibit to Unit’s Annual Report under thecover of Form 10-K for the year ended December 31, 2000). 10.2.13 Unit 2002 Employee Oil and Gas Limited Partnership Agreement of Limited Partnership (filed as an Exhibit to Unit’s Annual Report under coverof Form 10-K for the year ended December 31, 2001). 10.2.14 Unit 2003 Employee Oil and Gas Limited Partnership Agreement of Limited Partnership (filed as an Exhibit to Unit’s Annual Report under coverof Form 10-K for the year ended December 31, 2002). 123Table of Contents10.2.15 Unit 2004 Employee Oil and Gas Limited Partnership Agreement of Limited Partnership (filed as an Exhibit to Unit’s Annual Report under coverof Form 10-K for the year ended December 31, 2003). 10.2.16 Unit 2005 Employee Oil and Gas Limited Partnership Agreement of Limited Partnership (filed as an Exhibit to Unit’s Annual Report under coverof Form 10-K for the year ended December 31, 2004). 10.2.17* Form of Indemnification Agreement entered into between the Company and its executive officers and directors (filed as Exhibit 10.1 to Unit’sForm 8-K dated February 22, 2005, which is incorporated herein by reference). 10.2.18* Form of Indemnification Agreement entered into between the Company and its executive officers and directors (filed as an Exhibit to Unit'sAnnual Report under cover of Form 10-K for the year ended December 31, 2016). 10.2.19 Unit 2006 Employee Oil and Gas Limited Partnership Agreement of Limited Partnership (filed as an Exhibit to Unit’s Annual Report under coverof Form 10-K for the year ended December 31, 2005). 10.2.20 Unit 2007 Employee Oil and Gas Limited Partnership Agreement of Limited Partnership (filed as an Exhibit to Unit’s Annual Report under coverof Form 10-K for the year ended December 31, 2006). 10.2.21* Separation Benefit Plan as amended August 21, 2007 (filed as an Exhibit to Unit’s Form 10-Q for the quarter ended September 30, 2007). 10.2.22 Unit 2008 Employee Oil and Gas Limited Partnership Agreement of Limited Partnership (filed as an Exhibit to Unit’s Annual Report under coverof Form 10-K for the year ended December 31, 2007). 10.2.23* Annual Bonus Performance Plan entered into October 21, 2008 (filed as Exhibit 10.1 to Unit’s Form 8-K dated October 23, 2008, which isincorporated herein by reference). 10.2.24* Separation Benefit Plan as amended October 21, 2008 (filed as Exhibit 10.2 to Unit’s Form 8-K dated October 23, 2008, which is incorporatedherein by reference). 10.2.25* Separation Benefit Plan as amended December 31, 2008 (filed as Exhibit 10.1 to Unit’s Form 8-K dated January 6, 2009, which is incorporatedherein by reference). 10.2.26* Special Separation Benefit Plan as amended December 31, 2008 (filed as Exhibit 10.2 to Unit’s Form 8-K dated January 6, 2009, which isincorporated herein by reference). 10.2.27* Separation Benefit Plan for Senior Management as amended December 31, 2008 (filed as Exhibit 10.3 to Unit’s Form 8-K dated January 6, 2009,which is incorporated herein by reference). 10.2.28 Unit 2009 Employee Oil and Gas Limited Partnership Agreement of Limited Partnership (filed as an Exhibit to Unit’s Annual Report under coverof Form 10-K for the year ended December 31, 2008). 10.2.29* Unit Corporation 2000 Non-Employee Directors’ Stock Option Plan as Amended and Restated August 25, 2004 (as amended on May 29, 2009and filed as Exhibit 10.1 to Unit’s Form 8-K dated May 29, 2009, which is incorporated herein by reference). 10.2.30 Unit 2010 Employee Oil and Gas Limited Partnership Agreement of Limited Partnership (filed as an Exhibit to Unit’s Annual Report under coverof Form 10-K for the year ended December 31, 2009). 10.2.31 Unit 2011 Employee Oil and Gas Limited Partnership Agreement of Limited Partnership (filed as an Exhibit to Unit’s Annual Report under coverof Form 10-K for the year ended December 31, 2010). 10.2.32 Second Amendment and Consent, dated April 10, 2015, to the Senior Credit Agreement by and among the Company and the subsidiaries namedtherein (as borrowers), BOKF, NA DBA Bank of Oklahoma, as Administrative Agent, and the institutions named therein (as lenders) (filed asexhibit 10.1 to Unit's Form 8-K dated April 13, 2015, which is incorporated herein by reference). 10.2.33* Separation Benefit Plan as amended December 8, 2015 (filed as Exhibit 10.1 to Unit’s Form 8-K dated December 14, 2015, which is incorporatedherein by reference). 10.2.34* Special Separation Benefit Plan as amended December 8, 2015 (filed as Exhibit 10.2 to Unit’s Form 8-K dated December 14, 2015, which isincorporated herein by reference). 10.2.35 Third Amendment and Consent, dated April 8, 2016, to the Senior Credit Agreement by and among the Company and the subsidiaries namedtherein (as borrowers), BOKF, NA DBA Bank of Oklahoma, as Administrative Agent, and the institutions named therein (as lenders) (filed asexhibit 10.1 to Unit's Form 8-K dated April 8, 2016, which is incorporated herein by reference). 10.2.36 Distribution Agreement, dated April 4, 2017, between Unit Corporation and Raymond James & Associates, Inc. (filed as Exhibit 1.1 to ourcurrent report on Form 8-K dated April 4, 2017, filed April 4, 2017). 124Table of Contents12 Computation Ratio of Earnings to Fixed Charges (filed herein). 21 Subsidiaries of the Registrant (filed herein). 23.1 Consent of Independent Registered Public Accounting Firm, PricewaterhouseCoopers LLP (filed herein). 23.2 Consent of Ryder Scott Company, L.P. (filed herein). 31.1 Certification of Chief Executive Officer under Rule 13a - 14(a) of the Exchange Act (filed herein). 31.2 Certification of Chief Financial Officer under Rule 13a - 14(a) of the Exchange Act (filed herein). 32 Certification of Chief Executive Officer and Chief Financial Officer under Rule 13a-14(a) of the Exchange Act and 18 U.S.C. Section 1350, asadopted under Section 906 of the Sarbanes-Oxley Act of 2002 (filed herein). 99.1 Ryder Scott Company, L.P. Summary Report (filed herein). 101.INS XBRL Instance Document. 101.SCH XBRL Taxonomy Extension Schema Document. 101.CAL XBRL Taxonomy Extension Calculation Linkbase Document. 101.DEF XBRL Taxonomy Extension Definition Linkbase Document. 101.LAB XBRL Taxonomy Extension Labels Linkbase Document. 101.PRE XBRL Taxonomy Extension Presentation Linkbase Document.* Indicates a management contract or compensatory plan identified under the requirements of Item 15 of Form 10-K.Item 16. Form 10-K SummaryNot applicable.Schedule IIUNIT CORPORATION AND SUBSIDIARIESVALUATION AND QUALIFYING ACCOUNTS AND RESERVESAllowance for Doubtful Accounts:DescriptionBalance atBeginningof Period Additions Charged to Costs & Expenses Deductions& NetWrite-Offs Balance atEnd ofPeriod (In thousands)Year ended December 31, 2017$3,773 $348 $(1,671) $2,450Year ended December 31, 2016$5,199 $785 $(2,211) $3,773Year ended December 31, 2015$5,039 $1,191 $(1,031) $5,199125Table of ContentsSIGNATURESPursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on itsbehalf by the undersigned, thereunto duly authorized. UNIT CORPORATION DATE:February 27, 2018By:/s/ L ARRY D. P INKSTON LARRY D. PINKSTON President and Chief Executive Officer(Principal Executive Officer)Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the Registrantand in the capacities indicated on the 27th day of February, 2018.Name Title /s/ J. M ICHAEL A DCOCK Chairman of the Board and DirectorJ. Michael Adcock /s/ L ARRY D. P INKSTON President and Chief Executive Officer and Director (Principal Executive Officer)Larry D. Pinkston /s/ L ES A USTIN Senior Vice President, Chief Financial Officer (Principal FinancialOfficer)Les Austin /s/ D ON A. H AYES Vice President, Controller (Principal Accounting Officer)Don A. Hayes /s/ G ARY C HRISTOPHER DirectorGary Christopher /s/ S TEVEN B. H ILDEBRAND DirectorSteven B. Hildebrand /s/ C ARLA S. M ASHINSKI DirectorCarla S. Mashinski /s/ W ILLIAM B. M ORGAN DirectorWilliam B. Morgan /s/ L ARRY C. P AYNE DirectorLarry C. Payne /s/ G. B AILEY P EYTON IV DirectorG. Bailey Peyton IV /s/ R OBERT S ULLIVAN , J R . DirectorRobert Sullivan, Jr. 126Exhibit 12Unit CorporationComputation Ratio of Earnings to Fixed Charges 2017 2016 2015 2014 2013 (Dollars in thousands) Income (loss) from continuing operationsbefore income taxes$60,170 $(206,818) $(1,664,309) $222,939 $301,469 (Income) loss from equity investments— — (18) 133 238 Distribution from equity investments— — — 303 144 Interest expense37,763 39,295 31,464 16,904 14,578 Amortization of capitalized interest4,673 10,695(3 ) 38,695(3) 5,461(3 ) 3,080 Amortization of bond discount571 534 499 467 437 Earnings (loss)$103,177 $(156,294) $(1,593,669) $246,207 $319,946 Fixed charges (1) Interest expense$37,763 $39,295 $31,464 $16,904 $14,578 Capitalized interest15,948 15,293 21,711 32,246 33,670 Amortization of bond discount571 534 499 467 437 Total fixed charges$54,282 $55,122 $53,674 $49,617 $48,685 Ratio of earnings to fixed charges (2)1.9x—(4) —(4) 5.0x6.6x_________________________(1)Fixed charges are determined as defined in instructions for Item 503 of Regulation S-K of the Securities Act.(2)There were no shares of preferred stock outstanding during any of the time periods indicated in the table.(3)Amortization of capitalized interest includes the proportionate amount related to the ceiling test write-down.(4)Earnings for the years 2016 and 2015 were insufficient to cover fixed charges by $0.2 million and $1.7 billion, respectively.Exhibit 21SUBSIDIARIES OF THE REGISTRANTAll the companies listed below are included in the company's consolidated financial statements. Except as otherwise indicated below, the Company has100% direct or indirect ownership of, and ultimate voting control in, each of these companies. The list is as of December 31, 2017 and excludes subsidiaries whichare primarily inactive or taken singly, or as a group, do not constitute significant subsidiaries: State or Province Percentage Subsidiary of Incorporation Owned Unit Drilling Company Oklahoma 100% Unit Petroleum Company Oklahoma 100% Superior Pipeline Company, L.L.C. Oklahoma 100% EXHIBIT 23.1CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRMWe hereby consent to the incorporation by reference in the Registration Statement on Form S-3 (File No. 333-202956) and Form S-8 (File Nos. 333-38166, 333-39584, 333-135194, 333-137857, 333-166605, 333-181922, 333-205033, 333-208394, and 333-218606) of Unit Corporation of our report dated February 27, 2018relating to the financial statements, financial statement schedule, and the effectiveness of internal control over financial reporting, which appears in this Form 10-K./s/ PricewaterhouseCoopers LLPTulsa, OklahomaFebruary 27, 2018Exhibit 23.2 CONSENT OF RYDER SCOTT COMPANY, L.P. We hereby consent to incorporation by reference in the Registration Statements on Form S-3 (File No. 333-202956) and Form S-8 (FileNos. 333-38166, 333-39584, 333-135194, 333-137857, 333-166605, 333-181922, 333-205033, 333-208394, and 333-218606) of Unit Corporationof the reference to our reserves audit report for Unit Corporation dated January 31, 2018, which appears in the December 31, 2017 annual report onForm 10-K of Unit Corporation./s/ RYDER SCOTT COMPANY, L.P.RYDER SCOTT COMPANY, L.P.TBPE Firm Registration No. F-1580Houston, TexasFebruary 27, 2018Exhibit 31.1302 CERTIFICATIONSI, Larry D. Pinkston, certify that:1.I have reviewed this annual report on form 10-K of Unit Corporation;2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statementsmade, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financialcondition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;4.The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange ActRules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant andhave:(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, toensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within thoseentities, particularly during the period in which this report is being prepared;(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under oursupervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements forexternal purposes is accordance with generally accepted accounting principles;(c)Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about theeffectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and(d)Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recentfiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely tomaterially affect, the registrant's internal control over financial reporting; and5.The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant'sauditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which arereasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internalcontrol over financial reporting.Date: February 27, 2018/s/ Larry D. PinkstonLARRY D. PINKSTONChief Executive Officer and DirectorExhibit 31.2302 CERTIFICATIONSI, Les Austin, certify that:1.I have reviewed this annual report on form 10-K of Unit Corporation;2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statementsmade, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financialcondition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;4.The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange ActRules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant andhave:(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, toensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within thoseentities, particularly during the period in which this report is being prepared;(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under oursupervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements forexternal purposes is accordance with generally accepted accounting principles;(c)Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about theeffectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and(d)Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recentfiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely tomaterially affect, the registrant's internal control over financial reporting; and5.The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant'sauditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which arereasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internalcontrol over financial reporting.Date: February 27, 2018/s/ Les AustinLES AUSTINSenior Vice President and Chief Financial OfficerExhibit 32CERTIFICATIONPURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002(SUBSECTIONS (A) AND (B) OF SECTION 1350, CHAPTER 63 OF TITLE 18, UNITEDSTATES CODE)Pursuant to section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a) and (b) of section 1350, chapter 63 of title 18, United States Code), each of theundersigned officers of Unit Corporation a Delaware corporation (the "Company"), does hereby certify, to such officer's knowledge, that:The Annual Report on Form 10-K for the year ended December 31, 2017 (the "Form 10-K") of the Company fully complies with the requirements of section13(a) or 15(d) of the Securities Exchange Act of 1934 and information contained in the Form 10-K fairly presents, in all material respects, the financial conditionand results of operations of the Company as of December 31, 2017 and December 31, 2016 and for the years ended December 31, 2017 , 2016 , and 2015 .Dated: February 27, 2018By: /s/ Larry D. PinkstonLarry D. PinkstonChief Executive Officer and DirectorDated: February 27, 2018By: /s/ Les AustinLes AustinSenior Vice President and Chief Financial OfficerThe foregoing certification is being furnished solely pursuant to section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a) and (b) of section 1350,chapter 63 of title 18, United States Code) and is not being filed as part of the Form 10-K or as a separate disclosure document.A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to Unit Corporation and will beretained by Unit Corporation and furnished to the Securities and Exchange Commission or its staff on request.UNIT CORPORATIONEstimatedNet ReservesAttributable to CertainLeasehold InterestsSEC ParametersAs ofDecember 31, 2017\s\ Robert J. ParadisoRobert J. Paradiso, P.E.TBPE License No. 111861Vice President[SEAL]RYDER SCOTT COMPANY, L.P.TBPE Firm Registration No. F-1580RYDER SCOTT COMPANY PETROLEUM CONSULTANTSUnit CorporationJanuary 31, 2018Page 1January 31, 2018Unit Corporation8200 South Unit DriveTulsa, Oklahoma 74132Gentlemen:At the request of Unit Corporation (Unit), Ryder Scott Company, L.P. (Ryder Scott) has conducted a reserves audit of theestimates of the proved reserves as of December 31, 2017 prepared by Unit’s engineering and geological staff based on thedefinitions and disclosure guidelines of the United States Securities and Exchange Commission (SEC) contained in Title 17,Code of Federal Regulations, Modernization of Oil and Gas Reporting, Final Rule released January 14, 2009 in the FederalRegister (SEC regulations). Our third party reserves audit, completed on January 30, 2018 and presented herein, was preparedfor public disclosure by Unit in filings made with the SEC in accordance with the disclosure requirements set forth in the SECregulations. The estimated reserves shown herein represent Unit’s estimated net reserves attributable to the leasehold interestsin certain properties owned by Unit and the portion of those reserves reviewed by Ryder Scott, as of December 31, 2017. Theproperties reviewed by Ryder Scott incorporate 466 reserve determinations and are located in the states of Kansas, Louisiana,Oklahoma and Texas.The properties reviewed by Ryder Scott account for a portion of Unit’s total net proved reserves as of December 31,2017. Based on the estimates of total net proved reserves prepared by Unit, the reserves audit conducted by Ryder Scottaddresses 78 percent of the total proved developed net liquid hydrocarbon reserves, 68 percent of the total proved developednet gas reserves, 45 percent of the total proved undeveloped net liquid hydrocarbon reserves, and 38 percent of the total provedundeveloped net gas reserves of Unit. The properties reviewed by Ryder Scott account for a portion of Unit’s total proveddiscounted future net income using SEC hydrocarbon price parameters as of December 31, 2017. The wells or locations forwhich estimates of reserves were audited by Ryder Scott were selected by Unit. Unit informed Ryder Scott that the selectedentities included approximately 83 percent of Unit’s discounted future net income at 10 percent for the total proved developed,and 86 percent for the total proved.As prescribed by the Society of Petroleum Engineers in Paragraph 2.2(f) of the Standards Pertaining to the Estimatingand Auditing of Oil and Gas Reserves Information (SPE auditing standards), a reserves audit is defined as “the process ofreviewing certain of the pertinent facts interpreted and assumptions made that have resulted in an estimate of reserves and/orReserves Information prepared by others and the rendering of an opinion about (1) the appropriateness of the methodologiesemployed; (2) the adequacy and quality of the data relied upon; (3) the depth and thoroughness of the reserves estimationprocess; (4) the classification of reserves appropriate to the relevant definitions used; and (5) the reasonableness of theestimated reserve quantities and/or Reserves Information.” Reserves Information may consist of various estimates pertaining tothe extent and value of petroleum properties.Based on our review, including the data, technical processes and interpretations presented by Unit, it is our opinion thatthe overall procedures and methodologies utilized by Unit in preparing their estimates of the proved reserves as of December31, 2017 comply with the current SEC regulationsSUITE 600, 1015 4TH STREET, S.W. CALGARY, ALBERTA T2R 1J4 TEL (403) 262-2799 FAX (403) 262-2790621 17TH STREET, SUITE 1550 DENVER, COLORADO 80293-1501 TEL (303) 623-9147 FAX (303) 623-4258Unit CorporationJanuary 31, 2018Page 2and that the overall proved reserves for the reviewed properties as estimated by Unit are, in the aggregate, reasonable withinthe established audit tolerance guidelines of 10 percent as set forth in the SPE auditing standards.The estimated reserves presented in this report are related to hydrocarbon prices. Unit has informed us that in thepreparation of their reserve and income projections, as of December 31, 2017, they used average prices during the 12-monthperiod prior to the “as of date” of this report, determined as the unweighted arithmetic averages of the prices in effect on the first-day-of-the-month for each month within such period, unless prices were defined by contractual arrangements, as required by theSEC regulations. Actual future prices may vary significantly from the prices required by SEC regulations; therefore, volumes ofreserves actually recovered and the amounts of income actually received may differ significantly from the estimated quantitiespresented in this report. The net reserves as estimated by Unit attributable to Unit's interest in properties that we reviewed andthe reserves of properties that we did not review are summarized below:SEC PARAMETERSEstimated Net ReservesCertain Leasehold Interests ofUnit CorporationAs of December 31, 2017 Proved Developed Total Producing Non-Producing Undeveloped ProvedNet Reserves of PropertiesAudited by Ryder Scott Oil/Condensate - Mbbl 10,057 1,825 3,020 14,902 Plant Products - Mbbl 20,890 5,015 4,567 30,472 Gas - MMcf 209,123 53,561 45,737 308,421 Net Reserves of PropertiesNot Audited by Ryder Scott Oil/Condensate - Mbbl 2,217 763 1,631 4,611 Plant Products -Mbbl 5,889 1,564 7,561 15,014 Gas - MMcf 95,869 29,893 74,466 200,228 Total Net Reserves Oil/Condensate - Mbbl 12,274 2,588 4,651 19,513 Plant Products -Mbbl 26,779 6,579 12,128 45,486 Gas - MMcf 304,992 83,454 120,203 508,649Liquid hydrocarbons are expressed in thousands of standard 42 gallon barrels (Mbbl). The gas volumes are generallyreported on an “as sold basis” expressed in millions of cubic feet (MMcf) at the official temperature and pressure bases of theareas in which the gas reserves are located. In certain cases, the gas volumes presented herein include gas consumed inoperations as reserves. In those cases, Unit reduced the effective price such that the fuel use had no value.Reserves Included in This ReportIn our opinion, the proved reserves presented in this report conform to the definition as set forth in the Securities andExchange Commission’s Regulations Part 210.4-10(a). An abridged version ofRYDER SCOTT COMPANY PETROLEUM CONSULTANTSUnit CorporationJanuary 31, 2018Page 3the SEC reserves definitions from 210.4-10(a) entitled “Petroleum Reserves Definitions” is included as an attachment to thisreport.The various proved reserve status categories are defined under the attachment entitled “Petroleum Reserves Status andDefinitions Guidelines” in this report. The proved developed non-producing reserves included herein consist of the shut-in andbehind pipe categories.Reserves are “estimated remaining quantities of oil and gas and related substances anticipated to be economicallyproducible, as of a given date, by application of development projects to known accumulations.” All reserve estimates involve anassessment of the uncertainty relating the likelihood that the actual remaining quantities recovered will be greater or less thanthe estimated quantities determined as of the date the estimate is made. The uncertainty depends chiefly on the amount ofreliable geologic and engineering data available at the time of the estimate and the interpretation of these data. The relativedegree of uncertainty may be conveyed by placing reserves into one of two principal classifications, either proved or unproved.Unproved reserves are less certain to be recovered than proved reserves and may be further sub-classified as probable andpossible reserves to denote progressively increasing uncertainty in their recoverability. At Unit’s request, this report addressesonly the proved reserves attributable to the properties reviewed herein.Proved oil and gas reserves are “those quantities of oil and gas which, by analysis of geoscience and engineering data,can be estimated with reasonable certainty to be economically producible from a given date forward.” The proved reservesincluded herein were estimated using deterministic methods. The SEC has defined reasonable certainty for proved reserves,when based on deterministic methods, as a “high degree of confidence that the quantities will be recovered.”Proved reserve estimates will generally be revised only as additional geologic or engineering data become available oras economic conditions change. For proved reserves, the SEC states that “as changes due to increased availability ofgeoscience (geological, geophysical, and geochemical), engineering, and economic data are made to the estimated ultimaterecovery (EUR) with time, reasonably certain EUR is much more likely to increase or remain constant than to decrease.”Moreover, estimates of proved reserves may be revised as a result of future operations, effects of regulation by governmentalagencies or geopolitical or economic risks. Therefore, the proved reserves included in this report are estimates only and shouldnot be construed as being exact quantities, and if recovered, could be more or less than the estimated amounts.Audit Data, Methodology, Procedure and AssumptionsThe estimation of reserves involves two distinct determinations. The first determination results in the estimation of thequantities of recoverable oil and gas and the second determination results in the estimation of the uncertainty associated withthose estimated quantities in accordance with the definitions set forth by the Securities and Exchange Commission’sRegulations Part 210.4-10(a). The process of estimating the quantities of recoverable oil and gas reserves relies on the use ofcertain generally accepted analytical procedures. These analytical procedures fall into three broad categories or methods: (1)performance-based methods; (2) volumetric-based methods; and (3) analogy. These methods may be used individually or incombination by the reserve evaluator in the process of estimating the quantities of reserves. Reserve evaluators must select themethod or combination of methods which in their professional judgment is most appropriate given the nature and amount ofreliable geoscience and engineering data available at the time of the estimate, the established or anticipated performancecharacteristics of the reservoir being evaluated and the stage of development or producing maturity of the property.RYDER SCOTT COMPANY PETROLEUM CONSULTANTSUnit CorporationJanuary 31, 2018Page 4In many cases, the analysis of the available geoscience and engineering data and the subsequent interpretation of thisdata may indicate a range of possible outcomes in an estimate, irrespective of the method selected by the evaluator. When arange in the quantity of reserves is identified, the evaluator must determine the uncertainty associated with the incrementalquantities of the reserves. If the reserve quantities are estimated using the deterministic incremental approach, the uncertaintyfor each discrete incremental quantity of the reserves is addressed by the reserve category assigned by the evaluator.Therefore, it is the categorization of reserve quantities as proved, probable and/or possible that addresses the inherentuncertainty in the estimated quantities reported. For proved reserves, uncertainty is defined by the SEC as reasonable certaintywherein the “quantities actually recovered are much more likely than not to be achieved.” The SEC states that “probablereserves are those additional reserves that are less certain to be recovered than proved reserves but which, together withproved reserves, are as likely as not to be recovered.” The SEC states that “possible reserves are those additional reserves thatare less certain to be recovered than probable reserves and the total quantities ultimately recovered from a project have a lowprobability of exceeding proved plus probable plus possible reserves.” All quantities of reserves within the same reservecategory must meet the SEC definitions as noted above.Estimates of reserves quantities and their associated reserve categories may be revised in the future as additionalgeoscience or engineering data become available. Furthermore, estimates of reserves quantities and their associated reservecategories may also be revised due to other factors such as changes in economic conditions, results of future operations, effectsof regulation by governmental agencies or geopolitical or economic risks as previously noted herein.The proved reserves for the properties that we reviewed were estimated by performance methods, the volumetricmethod, analogy, or a combination of methods. Approximately 95 percent of the proved producing reserves attributable toproducing wells and/or reservoirs that we reviewed were estimated by performance methods. These performance methodsinclude, but may not be limited to, decline curve analysis and material balance which utilized extrapolations of historicalproduction and pressure data available through October - December 2017, in those cases where such data were considered tobe definitive. The data utilized in this analysis were furnished to Ryder Scott by Unit or obtained from public data sources andwere considered sufficient for the purpose thereof. The remaining 5 percent of the proved producing reserves that we reviewedwere estimated by the volumetric method, analogy, or a combination of methods. These methods were used where there wereinadequate historical performance data to establish a definitive trend and where the use of production performance data as abasis for the reserve estimates was considered to be inappropriate.Approximately 79 percent of the proved developed non-producing reserves that we reviewed were estimated by thevolumetric method. The remaining 21 percent of the proved developed non-producing reserves that we reviewed were estimatedby analogy. Approximately 82 percent of the proved undeveloped reserves that we reviewed were estimated by analogy. Theother 18 percent was estimated by the volumetric method. The volumetric analysis utilized pertinent well and seismic datafurnished to Ryder Scott by Unit for our review or which we have obtained from public data sources that were available throughOctober - December 2017. The data utilized from the analogues in conjunction with well and seismic data incorporated into thevolumetric analysis were considered sufficient for the purpose thereof.To estimate economically recoverable proved oil and gas reserves, we consider many factors and assumptions including,but not limited to, the use of reservoir parameters derived from geological, geophysical and engineering data which cannot bemeasured directly, economic criteria based on current costs and SEC pricing requirements, and forecasts of future productionrates. Under the SEC regulations 210.4-10(a)(22)(v) and (26), proved reserves must be anticipated to be economicallyRYDER SCOTT COMPANY PETROLEUM CONSULTANTSUnit CorporationJanuary 31, 2018Page 5producible from a given date forward based on existing economic conditions including the prices and costs at which economicproducibility from a reservoir is to be determined. While it may reasonably be anticipated that the future prices received for thesale of production and the operating costs and other costs relating to such production may increase or decrease from thoseunder existing economic conditions, such changes were, in accordance with rules adopted by the SEC, omitted fromconsideration in conducting this review.As stated previously, proved reserves must be anticipated to be economically producible from a given date forwardbased on existing economic conditions including the prices and costs at which economic producibility from a reservoir is to bedetermined. To confirm that the proved reserves reviewed by us meet the SEC requirements to be economically producible, wehave reviewed certain primary economic data utilized by Unit relating to hydrocarbon prices and costs as noted herein.The hydrocarbon prices furnished by Unit for the properties reviewed by us are based on SEC price parameters using theaverage prices during the 12-month period prior to the “as of date” of this report, determined as the unweighted arithmeticaverages of the prices in effect on the first-day-of-the-month for each month within such period, unless prices were defined bycontractual arrangements. For hydrocarbon products sold under contract, the contract prices, including fixed and determinableescalations exclusive of inflation adjustments, were used until expiration of the contract. Upon contract expiration, the priceswere adjusted to the 12-month unweighted arithmetic average as previously described.The initial SEC hydrocarbon prices in effect on December 31, 2017 for the properties reviewed by us were determinedusing the 12-month average first-day-of-the-month benchmark prices appropriate to the geographic area where thehydrocarbons are sold. These benchmark prices are prior to the adjustments for differentials as described herein. The tablebelow summarizes the “benchmark prices” and “price reference” used by Unit for the geographic area reviewed by us. In certaingeographic areas, the price reference and benchmark prices may be defined by contractual arrangements.The product prices which were actually used by Unit to determine the future gross revenue for each property reviewed byus reflect adjustments to the benchmark prices for gravity, quality, local conditions, gathering and transportation fees and/ordistance from market, referred to herein as “differentials.” The differentials used by Unit were accepted as factual data. We havenot conducted an independent verification of the data used by Unit.The table below summarizes Unit’s net volume weighted benchmark prices adjusted for differentials for the propertiesreviewed by us and referred to herein as Unit’s “average realized prices.” The average realized prices shown in the table belowwere determined from Unit’s estimate of the total future gross revenue before production taxes for the properties reviewed by usand Unit’s estimate of the total net reserves for the properties reviewed by us for the geographic area. The data shown in thetable below is presented in accordance with SEC disclosure requirements for each of the geographic areas reviewed by us.Geographic AreaProductPriceReferenceAverageBenchmark PricesAverage RealizedPrices United StatesOil/CondensateWTI Cushing$51.34/Bbl$48.89/BblNGLsMont Belvieu Non TET Propane$31.83/Bbl$20.17/BblGasHenry Hub$2.98/MMBTU$2.93/McfRYDER SCOTT COMPANY PETROLEUM CONSULTANTSUnit CorporationJanuary 31, 2018Page 6The effects of derivative instruments designated as price hedges of oil and gas quantities are not reflected in Unit’sindividual property evaluations.Accumulated gas production imbalances, if any, were not taken into account in the proved gas reserve estimatesreviewed.Operating costs furnished by Unit are based on the operating expense reports of Unit and include only those costsdirectly applicable to the leases or wells for the properties reviewed by us. The operating costs include a portion of general andadministrative costs allocated directly to the leases and wells. For operated properties, the operating costs include anappropriate level of corporate general administrative and overhead costs. The operating costs for non-operated propertiesinclude the COPAS overhead costs that are allocated directly to the leases and wells under terms of operating agreements. Theoperating costs furnished by Unit were accepted as factual data. We have not conducted an independent verification of the dataused by Unit. No deduction was made for loan repayments, interest expenses, or exploration and development prepaymentsthat were not charged directly to the leases or wells.Development costs furnished by Unit are based on authorizations for expenditure for the proposed work or actual costsfor similar projects. The development costs furnished by Unit were accepted as factual data. We have not conducted anindependent verification of the data used by Unit. Unit has informed us that abandonment costs are reported outside of thisreport; therefore, their projection of future net income associated with the reserve projections does not reflect abandonmentcosts.The proved developed non-producing and undeveloped reserves for the properties reviewed by us have beenincorporated herein in accordance with Unit’s plans to develop these reserves as of December 31, 2017. The implementation ofUnit’s development plans as presented to us is subject to the approval process adopted by Unit’s management. As the result ofour inquiries during the course of our review, Unit has informed us that the development activities for the properties reviewed byus have been subjected to and received the internal approvals required by Unit’s management at the appropriate local, regionaland/or corporate level. In addition to the internal approvals as noted, certain development activities may still be subject tospecific partner AFE processes, Joint Operating Agreement (JOA) requirements or other administrative approvals external toUnit. Unit has provided written documentation stating their commitment to proceed with the development activities as presentedto us. Additionally, Unit has informed us that they are not aware of any legal, regulatory or political obstacles that wouldsignificantly alter their plans. In accordance with SEC rules, actual or potential changes in economic conditions after theDecember 31, 2017 “as of date” of this report are not considered in making this evaluation.Current costs used by Unit were held constant throughout the life of the properties.Unit’s forecasts of future production rates are based on historical performance from wells currently on production. If noproduction decline trend has been established, future production rates were held constant, or adjusted for the effects ofcurtailment where appropriate, until a decline in ability to produce was anticipated. An estimated rate of decline was then appliedto depletion of the reserves. If a decline trend has been established, this trend was used as the basis for estimating futureproduction rates.Test data and other related information were used by Unit to estimate the anticipated initial production rates for thosewells or locations that are not currently producing. For reserves not yet on production, sales were estimated to commence at ananticipated date furnished by Unit. Wells orRYDER SCOTT COMPANY PETROLEUM CONSULTANTSUnit CorporationJanuary 31, 2018Page 7locations that are not currently producing may start producing earlier or later than anticipated in Unit’s estimates due tounforeseen factors causing a change in the timing to initiate production. Such factors may include delays due to weather, theavailability of rigs, the sequence of drilling, completing and/or recompleting wells and/or constraints set by regulatory bodies.The future production rates from wells currently on production or wells or locations that are not currently producing maybe more or less than estimated because of changes including, but not limited to, reservoir performance, operating conditionsrelated to surface facilities, compression and artificial lift, pipeline capacity and/or operating conditions, producing marketdemand and/or allowables or other constraints set by regulatory bodies.Unit’s operations may be subject to various levels of governmental controls and regulations. These controls andregulations may include, but may not be limited to, matters relating to land tenure and leasing, the legal rights to producehydrocarbons, drilling and production practices, environmental protection, marketing and pricing policies, royalties, various taxesand levies including income tax and are subject to change from time to time. Such changes in governmental regulations andpolicies may cause volumes of proved reserves actually recovered and amounts of proved income actually received to differsignificantly from the estimated quantities.The estimates of proved reserves presented herein were based upon a review of the properties in which Unit owns aninterest; however, we have not made any field examination of the properties. No consideration was given in this report topotential environmental liabilities that may exist nor were any costs included by Unit for potential liabilities to restore and cleanup damages, if any, caused by past operating practices.Certain technical personnel of Unit are responsible for the preparation of reserve estimates on new properties and for thepreparation of revised estimates, when necessary, on old properties. These personnel assembled the necessary data andmaintained the data and workpapers in an orderly manner. We consulted with these technical personnel and had access to theirworkpapers and supporting data in the course of our audit.Unit has informed us that they have furnished us all of the material accounts, records, geological and engineering data,and reports and other data required for this investigation. In performing our audit of Unit’s forecast of future proved production,we have relied upon data furnished by Unit with respect to property interests owned, production and well tests from examinedwells, normal direct costs of operating the wells or leases, other costs such as transportation and/or processing fees, ad valoremand production taxes, recompletion and development costs, development plans, abandonment costs after salvage, productprices based on the SEC regulations, adjustments or differentials to product prices, geological structural and isochore maps, welllogs, core analyses, and pressure measurements. Ryder Scott reviewed such factual data for its reasonableness; however, wehave not conducted an independent verification of the data furnished by Unit. We consider the factual data furnished to us byUnit to be appropriate and sufficient for the purpose of our review of Unit’s estimates of reserves. In summary, we consider theassumptions, data, methods and analytical procedures used by Unit and as reviewed by us appropriate for the purpose hereof,and we have used all such methods and procedures that we consider necessary and appropriate under the circumstances torender the conclusions set forth herein.Audit OpinionBased on our review, including the data, technical processes and interpretations presented by Unit, it is our opinion thatthe overall procedures and methodologies utilized by Unit in preparing theirRYDER SCOTT COMPANY PETROLEUM CONSULTANTSUnit CorporationJanuary 31, 2018Page 8estimates of the proved reserves as of December 31, 2017 comply with the current SEC regulations and that the overall provedreserves for the reviewed properties as estimated by Unit are, in the aggregate, reasonable within the established audittolerance guidelines of 10 percent as set forth in the SPE auditing standards. Ryder Scott found the processes and controlsused by Unit in their estimation of proved reserves to be effective and in the aggregate, we found no bias in the utilization andanalysis of data in estimates for these properties.We were in reasonable agreement with Unit's estimates of proved reserves for the properties which we reviewed;although, in certain cases there was more than an acceptable variance between Unit's estimates and our estimates due to adifference in interpretation of data or due to our having access to data which were not available to Unit when its reserveestimates were prepared. However, not withstanding, it is our opinion that on an aggregate basis the data presented herein forthe properties that we reviewed fairly reflects the estimated net reserves owned by Unit.Other PropertiesOther properties, as used herein, are those properties of Unit which we did not review. The proved net reservesattributable to the other properties account for 30 percent of the total proved net liquid hydrocarbon reserves and 39 percent ofthe total proved net gas reserves based on estimates prepared by Unit as of December 31, 2017.The same technical personnel of Unit were responsible for the preparation of the reserve estimates for the properties thatwe reviewed as well as for the properties not reviewed by Ryder Scott.Standards of Independence and Professional QualificationRyder Scott is an independent petroleum engineering consulting firm that has been providing petroleum consultingservices throughout the world since 1937. Ryder Scott is employee-owned and maintains offices in Houston, Texas; Denver,Colorado; and Calgary, Alberta, Canada. We have over eighty engineers and geoscientists on our permanent staff. By virtue ofthe size of our firm and the large number of clients for which we provide services, no single client or job represents a materialportion of our annual revenue. We do not serve as officers or directors of any privately-owned or publicly-traded oil and gascompany and are separate and independent from the operating and investment decision-making process of our clients. Thisallows us to bring the highest level of independence and objectivity to each engagement for our services.Ryder Scott actively participates in industry-related professional societies and organizes an annual public forum focusedon the subject of reserves evaluations and SEC regulations. Many of our staff have authored or co-authored technical papers onthe subject of reserves related topics. We encourage our staff to maintain and enhance their professional skills by activelyparticipating in ongoing continuing education.Prior to becoming an officer of the Company, Ryder Scott requires that staff engineers and geoscientists have receivedprofessional accreditation in the form of a registered or certified professional engineer’s license or a registered or certifiedprofessional geoscientist’s license, or the equivalent thereof, from an appropriate governmental authority or a recognized self-regulating professional organization.We are independent petroleum engineers with respect to Unit. Neither we nor any of our employees have any financialinterest in the subject properties, and neither the employment to do thisRYDER SCOTT COMPANY PETROLEUM CONSULTANTSUnit CorporationJanuary 31, 2018Page 9work nor the compensation is contingent on our estimates of reserves for the properties which were reviewed.The results of this audit, presented herein, are based on technical analysis conducted by teams of geoscientists andengineers from Ryder Scott. The professional qualifications of the undersigned, the technical person primarily responsible foroverseeing the review of the reserves information discussed in this report, are included as an attachment to this letter.Terms of UsageThe results of our third party audit, presented in report form herein, were prepared in accordance with the disclosurerequirements set forth in the SEC regulations and intended for public disclosure as an exhibit in filings made with the SEC byUnit.Unit makes periodic filings on Form 10-K with the SEC under the 1934 Exchange Act. Furthermore, Unit has certainregistration statements filed with the SEC under the 1933 Securities Act into which any subsequently filed Form 10-K isincorporated by reference. We have consented to the incorporation by reference in the registration statements on Form S-8 ofUnit of the references to our name as well as to the references to our third party report for Unit, which appears in the December31, 2017 annual report on Form 10-K of Unit. Our written consent for such use is included as a separate exhibit to the filingsmade with the SEC by Unit.We have provided Unit with a digital version of the original signed copy of this report letter. In the event there are anydifferences between the digital version included in filings made by Unit and the original signed report letter, the original signedreport letter shall control and supersede the digital version.The data and work papers used in the preparation of this report are available for examination by authorized parties in ouroffices. Please contact us if we can be of further service.Very truly yours,RYDER SCOTT COMPANY, L.P.TBPE Firm Registration No. F-1580/s/ Robert J. ParadisoRobert J. Paradiso, P.E.TBPE License No. 111861Vice President[SEAL]RJP (FWZ)/plRYDER SCOTT COMPANY PETROLEUM CONSULTANTSProfessional Qualifications of Primary Technical PersonThe conclusions presented in this report are the result of technical analysis conducted by teams of geoscientists and engineersfrom Ryder Scott Company, L.P. Robert J. Paradiso was the primary technical person responsible for overseeing the estimate ofthe reserves, future production and income prepared by Ryder Scott presented herein.Mr. Paradiso, an employee of Ryder Scott Company L.P. (Ryder Scott) since 2008, is a Vice President and also serves asProject Coordinator, responsible for coordinating and supervising staff and consulting engineers of the company in ongoingreservoir evaluation studies worldwide. Before joining Ryder Scott, Mr. Paradiso served in a number of engineering positionswith Getty Oil Company, Texaco, Union Texas Petroleum, Amax Oil and Gas, Inc., Norcen Explorer, Inc., Amerac EnergyCorporation, Halliburton Energy Services, Santa Fe Snyder Corp., and Devon Energy Corporation. For more informationregarding Mr. Paradiso’s geographic and job specific experience, please refer to the Ryder Scott Company website atwww.ryderscott.com/Company/Employees .Mr. Paradiso earned a Bachelor of Science degree in Petroleum Engineering from Texas Tech University in 1979, and is aregistered Professional Engineer in the State of Texas. He is also a member of the Society of Petroleum Engineers.In addition to gaining experience and competency through prior work experience, the Texas Board of Professional Engineersrequires a minimum of fifteen hours of continuing education annually, including at least one hour in the area of professionalethics, which Mr. Paradiso fulfills. As part of his 2017 continuing education hours, Mr. Paradiso attended 6 hours of formalizedtraining during the 2017 RSC Reserves Conference relating to the definitions and disclosure guidelines contained in the UnitedStates Securities and Exchange Commission Title 17, Code of Federal Regulations, Modernization of Oil and Gas Reporting,Final Rule released January 14, 2009 in the Federal Register. Mr. Paradiso attended an additional 37½ hours of formalized in-house training during 2017 covering such topics as the SPE/WPC/AAPG/SPEE Petroleum Resources Management System,reservoir engineering, geoscience and petroleum economics evaluation methods, procedures and software and ethics forconsultants.Based on his educational background, professional training and more than 38 years of practical experience in the estimation andevaluation of petroleum reserves, Mr. Paradiso has attained the professional qualifications as a Reserves Estimator andReserves Auditor set forth in Article III of the “Standards Pertaining to the Estimating and Auditing of Oil and Gas ReservesInformation” promulgated by the Society of Petroleum Engineers as of February 19, 2007.RYDER SCOTT COMPANY PETROLEUM CONSULTANTSPETROLEUM RESERVES DEFINITIONSPage 1PETROLEUM RESERVES DEFINITIONSAs Adapted From:RULE 4-10(a) of REGULATION S-X PART 210UNITED STATES SECURITIES AND EXCHANGE COMMISSION (SEC)PREAMBLEOn January 14, 2009, the United States Securities and Exchange Commission (SEC) published the “Modernization of Oiland Gas Reporting; Final Rule” in the Federal Register of National Archives and Records Administration (NARA). The“Modernization of Oil and Gas Reporting; Final Rule” includes revisions and additions to the definition section in Rule 4-10 ofRegulation S-X, revisions and additions to the oil and gas reporting requirements in Regulation S-K, and amends and codifiesIndustry Guide 2 in Regulation S-K. The “Modernization of Oil and Gas Reporting; Final Rule”, including all references toRegulation S-X and Regulation S-K, shall be referred to herein collectively as the “SEC regulations”. The SEC regulations takeeffect for all filings made with the United States Securities and Exchange Commission as of December 31, 2009, or afterJanuary 1, 2010. Reference should be made to the full text under Title 17, Code of Federal Regulations, Regulation S-X Part210, Rule 4-10(a) for the complete definitions (direct passages excerpted in part or wholly from the aforementioned SECdocument are denoted in italics herein).Reserves are estimated remaining quantities of oil and gas and related substances anticipated to be economicallyproducible, as of a given date, by application of development projects to known accumulations. All reserve estimates involve anassessment of the uncertainty relating the likelihood that the actual remaining quantities recovered will be greater or less thanthe estimated quantities determined as of the date the estimate is made. The uncertainty depends chiefly on the amount ofreliable geologic and engineering data available at the time of the estimate and the interpretation of these data. The relativedegree of uncertainty may be conveyed by placing reserves into one of two principal classifications, either proved or unproved.Unproved reserves are less certain to be recovered than proved reserves and may be further sub-classified as probable andpossible reserves to denote progressively increasing uncertainty in their recoverability. Under the SEC regulations as ofDecember 31, 2009, or after January 1, 2010, a company may optionally disclose estimated quantities of probable or possible oiland gas reserves in documents publicly filed with the SEC. The SEC regulations continue to prohibit disclosure of estimates ofoil and gas resources other than reserves and any estimated values of such resources in any document publicly filed with theSEC unless such information is required to be disclosed in the document by foreign or state law as noted in §229.1202Instruction to Item 1202.Reserves estimates will generally be revised only as additional geologic or engineering data become available or aseconomic conditions change.Reserves may be attributed to either natural energy or improved recovery methods. Improved recovery methods includeall methods for supplementing natural energy or altering natural forces in the reservoir to increase ultimate recovery. Examplesof such methods are pressure maintenance, natural gas cycling, waterflooding, thermal methods, chemical flooding, and the useof miscible and immiscible displacement fluids. Other improved recovery methods may be developed in the future as petroleumtechnology continues to evolve.Reserves may be attributed to either conventional or unconventional petroleum accumulations. Petroleum accumulationsare considered as either conventional or unconventional based on the nature of their in-place characteristics, extraction methodapplied, or degree of processing prior to sale.RYDER SCOTT COMPANY PETROLEUM CONSULTANTSPETROLEUM RESERVES DEFINITIONSPage 2Examples of unconventional petroleum accumulations include coalbed or coalseam methane (CBM/CSM), basin-centered gas,shale gas, gas hydrates, natural bitumen and oil shale deposits. These unconventional accumulations may require specializedextraction technology and/or significant processing prior to sale.Reserves do not include quantities of petroleum being held in inventory.Because of the differences in uncertainty, caution should be exercised when aggregating quantities of petroleum fromdifferent reserves categories.RESERVES (SEC DEFINITIONS)Securities and Exchange Commission Regulation S-X §210.4-10(a)(26) defines reserves as follows:Reserves. Reserves are estimated remaining quantities of oil and gas and related substances anticipated to be economicallyproducible, as of a given date, by application of development projects to known accumulations. In addition, there must exist, orthere must be a reasonable expectation that there will exist, the legal right to produce or a revenue interest in the production,installed means of delivering oil and gas or related substances to market, and all permits and financing required to implementthe project.Note to paragraph (a)(26): Reserves should not be assigned to adjacent reservoirs isolated by major, potentially sealing, faultsuntil those reservoirs are penetrated and evaluated as economically producible. Reserves should not be assigned to areas thatare clearly separated from a known accumulation by a non-productive reservoir ( i.e. , absence of reservoir, structurally lowreservoir, or negative test results). Such areas may contain prospective resources ( i.e. , potentially recoverable resources fromundiscovered accumulations).PROVED RESERVES (SEC DEFINITIONS)Securities and Exchange Commission Regulation S-X §210.4-10(a)(22) defines proved oil and gas reserves as follows:Proved oil and gas reserves. Proved oil and gas reserves are those quantities of oil and gas, which, by analysis of geoscienceand engineering data, can be estimated with reasonable certainty to be economically producible-from a given date forward, fromknown reservoirs, and under existing economic conditions, operating methods, and government regulations-prior to the time atwhich contracts providing the right to operate expire, unless evidence indicates that renewal is reasonably certain, regardless ofwhether deterministic or probabilistic methods are used for the estimation. The project to extract the hydrocarbons must havecommenced or the operator must be reasonably certain that it will commence the project within a reasonable time.(i) The area of the reservoir considered as proved includes:(A) The area identified by drilling and limited by fluid contacts, if any, and(B) Adjacent undrilled portions of the reservoir that can, with reasonable certainty, be judged to be continuous withit and to contain economically producible oil or gas on the basis of available geoscience and engineering data.RYDER SCOTT COMPANY PETROLEUM CONSULTANTSPETROLEUM RESERVES DEFINITIONSPage 3PROVED RESERVES (SEC DEFINITIONS) CONTINUED(ii) In the absence of data on fluid contacts, proved quantities in a reservoir are limited by the lowest known hydrocarbons(LKH) as seen in a well penetration unless geoscience, engineering, or performance data and reliable technologyestablishes a lower contact with reasonable certainty.(iii) Where direct observation from well penetrations has defined a highest known oil (HKO) elevation and the potentialexists for an associated gas cap, proved oil reserves may be assigned in the structurally higher portions of the reservoironly if geoscience, engineering, or performance data and reliable technology establish the higher contact with reasonablecertainty.(iv) Reserves which can be produced economically through application of improved recovery techniques (including, butnot limited to, fluid injection) are included in the proved classification when:(A) Successful testing by a pilot project in an area of the reservoir with properties no more favorable than in thereservoir as a whole, the operation of an installed program in the reservoir or an analogous reservoir, or otherevidence using reliable technology establishes the reasonable certainty of the engineering analysis on which theproject or program was based; and(B) The project has been approved for development by all necessary parties and entities, including governmentalentities.(v) Existing economic conditions include prices and costs at which economic producibility from a reservoir is to bedetermined. The price shall be the average price during the 12-month period prior to the ending date of the periodcovered by the report, determined as an unweighted arithmetic average of the first-day-of-the-month price for each monthwithin such period, unless prices are defined by contractual arrangements, excluding escalations based upon futureconditions.RYDER SCOTT COMPANY PETROLEUM CONSULTANTSPETROLEUM RESERVES STATUS DEFINITIONS AND GUIDELINESPage 2PETROLEUM RESERVES STATUS DEFINITIONS AND GUIDELINESAs Adapted From:RULE 4-10(a) of REGULATION S-X PART 210UNITED STATES SECURITIES AND EXCHANGE COMMISSION (SEC)andPETROLEUM RESOURCES MANAGEMENT SYSTEM (SPE-PRMS)Sponsored and Approved by:SOCIETY OF PETROLEUM ENGINEERS (SPE)WORLD PETROLEUM COUNCIL (WPC)AMERICAN ASSOCIATION OF PETROLEUM GEOLOGISTS (AAPG)SOCIETY OF PETROLEUM EVALUATION ENGINEERS (SPEE)Reserves status categories define the development and producing status of wells and reservoirs. Reference should bemade to Title 17, Code of Federal Regulations, Regulation S-X Part 210, Rule 4-10(a) and the SPE-PRMS as the followingreserves status definitions are based on excerpts from the original documents (direct passages excerpted from theaforementioned SEC and SPE-PRMS documents are denoted in italics herein).DEVELOPED RESERVES (SEC DEFINITIONS)Securities and Exchange Commission Regulation S-X §210.4-10(a)(6) defines developed oil and gas reserves as follows:Developed oil and gas reserves are reserves of any category that can be expected to be recovered:(i) Through existing wells with existing equipment and operating methods or in which the cost of the requiredequipment is relatively minor compared to the cost of a new well; and(ii) Through installed extraction equipment and infrastructure operational at the time of the reserves estimate if theextraction is by means not involving a well.Developed Producing (SPE-PRMS Definitions)While not a requirement for disclosure under the SEC regulations, developed oil and gas reserves may be further sub-classified according to the guidance contained in the SPE-PRMS as Producing or Non-Producing.Developed Producing ReservesDeveloped Producing Reserves are expected to be recovered from completion intervals that are open and producing atthe time of the estimate.Improved recovery reserves are considered producing only after the improved recovery project is in operation.RYDER SCOTT COMPANY PETROLEUM CONSULTANTSPETROLEUM RESERVES STATUS DEFINITIONS AND GUIDELINESPage 2Developed Non-ProducingDeveloped Non-Producing Reserves include shut-in and behind-pipe reserves.Shut-InShut-in Reserves are expected to be recovered from:(1)completion intervals which are open at the time of the estimate, but which have not started producing;(2)wells which were shut-in for market conditions or pipeline connections; or(3)wells not capable of production for mechanical reasons.Behind-PipeBehind-pipe Reserves are expected to be recovered from zones in existing wells, which will require additional completionwork or future re-completion prior to start of production.In all cases, production can be initiated or restored with relatively low expenditure compared to the cost of drilling a newwell.UNDEVELOPED RESERVES (SEC DEFINITIONS)Securities and Exchange Commission Regulation S-X §210.4-10(a)(31) defines undeveloped oil and gas reserves asfollows:Undeveloped oil and gas reserves are reserves of any category that are expected to be recovered from new wells onundrilled acreage, or from existing wells where a relatively major expenditure is required for recompletion.(i)Reserves on undrilled acreage shall be limited to those directly offsetting development spacing areas thatare reasonably certain of production when drilled, unless evidence using reliable technology exists thatestablishes reasonable certainty of economic producibility at greater distances.(ii) Undrilled locations can be classified as having undeveloped reserves only if a development plan has beenadopted indicating that they are scheduled to be drilled within five years, unless the specific circumstances, justifya longer time.(iii) Under no circumstances shall estimates for undeveloped reserves be attributable to any acreage for which anapplication of fluid injection or other improved recovery technique is contemplated, unless such techniques havebeen proved effective by actual projects in the same reservoir or an analogous reservoir, as defined in paragraph(a)(2) of this section, or by other evidence using reliable technology establishing reasonable certainty.RYDER SCOTT COMPANY PETROLEUM CONSULTANTSCorporate Information STOCK LISTING Our common stock trades on the New York Stock Exchange under the symbol: “UNT.” During 2017, our average daily trading volume on the NYSE was 580,214 shares. Approximately 52.9 million shares were outstanding at the end of 2017. ANNUAL MEETING OF SHAREHOLDERS May 2, 2018, 11:00 a.m. Central Time Unit Corporation Headquarters, 8200 S. Unit Drive, Tulsa, Oklahoma 74132 INVESTOR RELATIONS The Form 10-Q reports are available in May, August, and November. The Form 10-K and Form 10-Q are available for viewing on our website at www.unitcorp.com. Copies of the Forms 10-K, 10-Q, and Annual Report, filed with the Securities and Exchange Commission, are available without charge on written request to: Investor Relations Department 8200 South Unit Drive Tulsa, Oklahoma 74132 918.493.7700 INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM PricewaterhouseCoopers LLP Tulsa, Oklahoma INDEPENDENT PETROLEUM ENGINEERS Ryder Scott Company, L.P. COMPENSATION COMMITTEE CARLA S. MASHINSKI Chair J. MICHAEL ADCOCK WILLIAM B. MORGAN STEVEN B. HILDEBRAND GARY R. CHRISTOPHER NOMINATING & GOVERNANCE COMMITTEE WILLIAM B. MORGAN Chair LARRY C. PAYNE ROBERT J. SULLIVAN JR. AUDIT COMMITTEE STEVEN B. HILDEBRAND Chair J. MICHAEL ADCOCK GARY R. CHRISTOPHER WILLIAM B. MORGAN LARRY C. PAYNE CARLA S. MASHINSKI TRANSFER AGENT & REGISTRAR Communications concerning the transfer of shares, lost certificates and changes of address should be directed to: American Stock Transfer & Trust Co. 6201 15th Avenue Brooklyn, NY 11219 800.710.0929 www.astfinancial.com BOARD OF DIRECTORS J. MICHAEL ADCOCK Board Chair Shawnee, Oklahoma GARY R. CHRISTOPHER Investments Tulsa, Oklahoma STEVEN B. HILDEBRAND Investments Tulsa, Oklahoma CARLA S. MASHINSKI Chief Financial and Administrative Officer Cameron LNG Houston, Texas WILLIAM B. MORGAN Investments Scottsdale, Arizona LARRY C. PAYNE President and CEO of LESA and Associates, LLC Tulsa, Oklahoma G. BAILEY PEYTON IV President, Peyton Holdings Canadian, Texas LARRY D. PINKSTON Chief Executive Officer and President Tulsa, Oklahoma ROBERT J. SULLIVAN, JR. Manager of Sullivan and Company LLC Tulsa, Oklahoma DIRECTOR EMERITUS KING P. KIRCHNER Co-founder, Unit Corporation Tulsa, Oklahoma MANAGEMENT J. MICHAEL ADCOCK Board Chair LARRY D. PINKSTON Chief Executive Officer and President DAVID T. MERRILL Chief Operating Officer MARK E. SCHELL Senior Vice President, General Counsel, and Secretary G. LES AUSTIN Senior Vice President and Chief Financial Officer DAVID P. DUNHAM Senior Vice President, Business Development I U N T C O R P O R A T O N I 2 0 1 7 A n n u a l R e p o r t NYSE: UNT www.unitcorp.com

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