Chord Energy (CHRD) 10-Q 6 Nov 19 2019 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2019	Oct. 31, 2019
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2019
Document Transition Report	false
Entity File Number	1-34776
Entity Registrant Name	Oasis Petroleum Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	80-0554627
Entity Address, Address Line One	1001 Fannin Street, Suite 1500
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77002
City Area Code	281
Local Phone Number	404-9500
Title of 12(b) Security	Common Stock
Trading Symbol	OAS
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		321,311,099
Document Fiscal Year Focus	2019
Amendment Flag	false
Document Fiscal Period Focus	Q3
Entity Central Index Key	0001486159
Current Fiscal Year End Date	--12-31

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 19,425	$ 22,190
Accounts receivable, net	381,617	387,602
Inventory	36,758	33,128
Prepaid expenses	5,302	10,997
Derivative instruments	52,180	99,930
Intangible assets, net	0	125
Other current assets	332	183
Total current assets	495,614	554,155
Property, plant and equipment
Oil and gas properties (successful efforts method)	9,374,506	8,912,189
Other property and equipment	1,339,268	1,151,772
Less: accumulated depreciation, depletion, amortization and impairment	(3,624,164)	(3,036,852)
Total property, plant and equipment, net	7,089,610	7,027,109
Assets held for sale, net	6,700	0
Derivative instruments	9,729	6,945
Long-term inventory	14,395	12,260
Operating right-of-use assets	21,255
Other assets	29,674	25,673
Total assets	7,666,977	7,626,142
Current liabilities
Accounts payable	18,003	20,166
Revenues and production taxes payable	213,773	216,695
Accrued liabilities	325,445	331,651
Accrued interest payable	21,329	38,040
Derivative instruments	830	84
Advances from joint interest partners	3,649	5,140
Current operating lease liabilities	8,050
Other current liabilities	2,782	0
Total current liabilities	593,861	611,776
Long-term debt	2,798,859	2,735,276
Deferred income taxes	291,215	300,055
Asset retirement obligations	55,502	52,384
Liabilities held for sale	6,700	0
Derivative instruments	0	20
Operating lease liabilities	19,095
Other liabilities	2,084	7,751
Total liabilities	3,767,316	3,707,262
Commitments and contingencies
Stockholders’ equity
Common stock, $0.01 par value: 900,000,000 shares authorized; 324,235,047 shares issued and 321,343,995 shares outstanding at September 30, 2019 and 320,469,049 shares issued and 318,377,161 shares outstanding at December 31, 2018	3,186	3,157
Treasury stock, at cost: 2,891,052 and 2,091,888 shares at September 30, 2019 and December 31, 2018, respectively	(33,650)	(29,025)
Additional paid-in capital	3,104,938	3,077,755
Retained earnings	630,852	682,689
Oasis share of stockholders’ equity	3,705,326	3,734,576
Non-controlling interests	194,335	184,304
Total stockholders’ equity	3,899,661	3,918,880
Total liabilities and stockholders’ equity	$ 7,666,977	$ 7,626,142

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Sep. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	900,000,000	900,000,000
Common stock, shares issued (in shares)	324,235,047	320,469,049
Common stock, shares outstanding (in shares)	321,343,995	318,377,161
Treasury stock, shares (in shares)	2,891,052	2,091,888

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues
Total revenues	$ 482,743	$ 674,629	$ 1,587,880	$ 1,722,192
Operating expenses
Lease operating expenses	50,313	48,534	164,985	137,456
Marketing, transportation and gathering expenses	32,659	30,713	96,097	74,559
Production taxes	28,461	38,722	86,221	103,748
Depreciation, depletion and amortization	210,832	162,984	578,023	465,819
Exploration expenses	652	22,315	2,369	23,701
Impairment	0	0	653	384,228
General and administrative expenses	52,860	34,859	118,245	91,029
Total operating expenses	473,550	532,453	1,453,473	1,711,659
Gain (loss) on sale of properties	(752)	36,869	(3,950)	38,823
Operating income	8,441	179,045	130,457	49,356
Other income (expense)
Net gain (loss) on derivative instruments	47,922	(48,544)	(34,940)	(239,945)
Interest expense, net of capitalized interest	(43,897)	(39,560)	(131,551)	(117,616)
Loss on extinguishment of debt	0	(47)	0	(13,698)
Other income	473	111	706	146
Total other income (expense), net	4,498	(88,040)	(165,785)	(371,113)
Income (loss) before income taxes	12,939	91,005	(35,328)	(321,757)
Income tax benefit (expense)	17,372	(24,782)	8,835	75,391
Net income (loss) including non-controlling interests	30,311	66,223	(26,493)	(246,366)
Less: Net income attributable to non-controlling interests	10,023	3,882	25,344	10,907
Net income (loss) attributable to Oasis	$ 20,288	$ 62,341	$ (51,837)	$ (257,273)
Earnings (loss) attributable to Oasis per share:
Basic (in dollars per share)		$ 0.20	$ (0.16)	$ (0.84)
Diluted (in dollars per share)		$ 0.20	$ (0.16)	$ (0.84)
Weighted average shares outstanding:
Basic (in shares)	315,135	313,167	314,863	305,533
Diluted (in shares)	315,135	316,387	314,863	305,533
Oil and gas revenues
Revenues
Total revenues	$ 344,470	$ 454,195	$ 1,070,256	$ 1,218,639
Purchased oil and gas
Revenues
Total revenues	79,352	172,985	337,212	368,758
Operating expenses
Expenses	78,655	174,269	338,221	374,442
Midstream Services
Revenues
Total revenues	50,023	31,187	149,617	88,451
Operating expenses
Expenses	12,967	8,652	47,064	24,325
Well Services
Revenues
Total revenues	8,898	16,262	30,795	46,344
Operating expenses
Expenses	$ 6,151	$ 11,405	$ 21,595	$ 32,352

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Non-controlling Interests
Balance (shares) at Dec. 31, 2017		269,295	(1,332)
Balance at Dec. 31, 2017	$ 3,513,579	$ 2,668	$ (22,179)	$ 2,677,217	$ 717,985	$ 137,888
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock due to acquisition (shares)		46,000
Issuance of common stock due to acquisition	371,220	$ 460		370,760
Equity-based compensation (shares)		2,758
Equity-based compensation	7,208	$ 26		7,116		66
Distributions to non-controlling interest owners	(3,450)					(3,450)
Treasury stock - tax withholdings (shares)		(690)	(690)
Treasury stock - tax withholdings	(6,021)		$ (6,021)
Other	(90)			(90)
Net income (loss)	3,712				590	3,122
Balance (shares) at Mar. 31, 2018		317,363	(2,022)
Balance at Mar. 31, 2018	3,886,158	$ 3,154	$ (28,200)	3,055,003	718,575	137,626
Balance (shares) at Dec. 31, 2017		269,295	(1,332)
Balance at Dec. 31, 2017	3,513,579	$ 2,668	$ (22,179)	2,677,217	717,985	137,888
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(246,366)
Balance (shares) at Sep. 30, 2018		318,419	(2,089)
Balance at Sep. 30, 2018	3,644,083	$ 3,157	$ (28,985)	3,070,642	460,712	138,557
Balance (shares) at Mar. 31, 2018		317,363	(2,022)
Balance at Mar. 31, 2018	3,886,158	$ 3,154	$ (28,200)	3,055,003	718,575	137,626
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation (shares)		625
Equity-based compensation	7,830			7,730		100
Distributions to non-controlling interest owners	(3,396)					(3,396)
Treasury stock - tax withholdings (shares)		(3)	(3)
Treasury stock - tax withholdings	(43)		$ (43)
Other	3			128		(125)
Net income (loss)	(316,301)				(320,204)	3,903
Balance (shares) at Jun. 30, 2018		317,985	(2,025)
Balance at Jun. 30, 2018	3,574,251	$ 3,154	$ (28,243)	3,062,861	398,371	138,108
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation (shares)		498
Equity-based compensation	7,898			7,781		114
Distributions to non-controlling interest owners	(3,547)					(3,547)
Treasury stock - tax withholdings (shares)		(64)	(64)
Treasury stock - tax withholdings	(742)		$ (742)
Net income (loss)	66,223				62,341	3,882
Balance (shares) at Sep. 30, 2018		318,419	(2,089)
Balance at Sep. 30, 2018	3,644,083	$ 3,157	$ (28,985)	3,070,642	460,712	138,557
Balance (shares) at Dec. 31, 2018		318,377	(2,092)
Balance at Dec. 31, 2018	3,918,880	$ 3,157	$ (29,025)	3,077,755	682,689	184,304
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation (shares)		4,360
Equity-based compensation	9,606	$ 25		9,462		119
Distributions to non-controlling interest owners	(4,937)					(4,937)
Treasury stock - tax withholdings (shares)		(686)	(686)
Treasury stock - tax withholdings	(4,261)		$ (4,261)			0
Other	(175)			(134)		(41)
Net income (loss)	(107,978)				(114,882)	6,904
Balance (shares) at Mar. 31, 2019		322,051	(2,778)
Balance at Mar. 31, 2019	3,811,135	$ 3,182	$ (33,286)	3,087,083	567,807	186,349
Balance (shares) at Dec. 31, 2018		318,377	(2,092)
Balance at Dec. 31, 2018	3,918,880	$ 3,157	$ (29,025)	3,077,755	682,689	184,304
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(26,493)
Balance (shares) at Sep. 30, 2019		321,344	(2,891)
Balance at Sep. 30, 2019	3,899,661	$ 3,186	$ (33,650)	3,104,938	630,852	194,335
Balance (shares) at Mar. 31, 2019		322,051	(2,778)
Balance at Mar. 31, 2019	3,811,135	$ 3,182	$ (33,286)	3,087,083	567,807	186,349
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation (shares)		149
Equity-based compensation	9,566	$ 1		9,465		100
Distributions to non-controlling interest owners	(5,156)					(5,156)
Treasury stock - tax withholdings (shares)		(8)	(8)
Treasury stock - tax withholdings	(44)		$ (44)			0
Other	(217)			(193)		(24)
Net income (loss)	51,174				42,757	8,417
Balance (shares) at Jun. 30, 2019		321,894	(2,786)
Balance at Jun. 30, 2019	3,866,458	$ 3,183	$ (33,330)	3,096,355	610,564	189,686
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation (shares)		445
Equity-based compensation	8,670	$ 3		8,583		84
Distributions to non-controlling interest owners	(5,458)					(5,458)
Treasury stock - tax withholdings (shares)		(105)	(105)
Treasury stock - tax withholdings	(320)		$ (320)
Net income (loss)	30,311				20,288	10,023
Balance (shares) at Sep. 30, 2019		321,344	(2,891)
Balance at Sep. 30, 2019	$ 3,899,661	$ 3,186	$ (33,650)	$ 3,104,938	$ 630,852	$ 194,335

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net loss including non-controlling interests	$ (26,493)	$ (246,366)
Adjustments to reconcile net loss including non-controlling interests to net cash provided by operating activities:
Depreciation, depletion and amortization	578,023	465,819
Loss on extinguishment of debt	0	13,698
(Gain) loss on sale of properties	3,950	(38,823)
Impairment	653	384,228
Deferred income taxes	(8,840)	(75,418)
Derivative instruments	34,940	239,945
Equity-based compensation expenses	26,370	21,586
Deferred financing costs amortization and other	18,190	20,074
Working capital and other changes:
Change in accounts receivable, net	1,555	(61,275)
Change in inventory	(3,676)	(12,076)
Change in prepaid expenses	4,153	1,196
Change in accounts payable, interest payable and accrued liabilities	22,280	50,308
Change in other assets and liabilities, net	(11,211)	(895)
Net cash provided by operating activities	639,894	762,001
Cash flows from investing activities:
Capital expenditures	(714,270)	(841,088)
Acquisitions	(8,337)	(579,886)
Proceeds from sale of properties	41,039	333,029
Costs related to sale of properties	0	(2,707)
Derivative settlements	10,752
Derivative settlements		(162,013)
Other	0	(1,038)
Net cash used in investing activities	(670,816)	(1,253,703)
Cash flows from financing activities:
Proceeds from Revolving Credit Facilities	1,651,000	2,499,000
Principal payments on Revolving Credit Facilities	(1,600,000)	(1,959,000)
Repurchase of senior unsecured notes	0	(423,190)
Proceeds from issuance of senior unsecured notes	0	400,000
Deferred financing costs	(852)	(7,650)
Purchases of treasury stock	(4,625)	(6,806)
Distributions to non-controlling interests	(15,551)	(10,393)
Payments on finance lease liabilities	(1,423)	0
Other	(392)	(87)
Net cash provided by financing activities	28,157	491,874
Increase (decrease) in cash and cash equivalents	(2,765)	172
Cash and cash equivalents:
Beginning of period	22,190	16,720
End of period	19,425	16,892
Supplemental non-cash transactions:
Change in accrued capital expenditures	(42,751)	79,011
Change in asset retirement obligations	4,114	2,854
Issuance of shares in connection with acquisition	$ 0	$ 371,220

Organization and Operations of

Organization and Operations of the Company	9 Months Ended
	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Operations of the Company	Organization and Operations of the CompanyOasis Petroleum Inc. (together with its consolidated subsidiaries, “Oasis” or the “Company”) is an independent exploration and production company focused on the acquisition and development of onshore, unconventional crude oil and natural gas resources in the United States. Oasis Petroleum North America LLC (“OPNA”) and Oasis Petroleum Permian LLC (“OP Permian”) conduct the Company’s exploration and production activities and own its crude oil and natural gas properties located in the Williston Basin and the Delaware Basin, respectively. In addition to its exploration and production segment, the Company also operates a midstream business segment through Oasis Midstream Partners LP (“OMP”) and Oasis Midstream Services LLC (“OMS”) and a well services business segment through Oasis Well Services LLC (“OWS”). OMP is a growth-oriented, fee-based master limited partnership that develops and operates a diversified portfolio of midstream assets.

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation The accompanying condensed consolidated financial statements of the Company have not been audited by the Company’s independent registered public accounting firm, except that the Condensed Consolidated Balance Sheet at December 31, 2018 is derived from audited financial statements. Certain reclassifications of prior year balances have been made to conform such amounts to current year classifications. These reclassifications have no impact on net income. In the opinion of management, all adjustments, consisting of normal recurring adjustments necessary for the fair statement of the Company’s financial position, have been included. Management has made certain estimates and assumptions that affect reported amounts in the condensed consolidated financial statements and disclosures of contingencies. Actual results may differ from those estimates. The results for interim periods are not necessarily indicative of annual results. These interim financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Certain disclosures have been condensed or omitted from these financial statements. Accordingly, they do not include all of the information and notes required by accounting principles generally accepted in the United States of America (“GAAP”) for complete consolidated financial statements and should be read in conjunction with the Company’s audited consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018 (“2018 Annual Report”). Consolidation. The accompanying condensed consolidated financial statements of the Company include the accounts of Oasis, the accounts of wholly-owned subsidiaries and the accounts of OMP and its general partner, OMP GP LLC (“OMP GP”). The Company has determined that the partners with equity at risk in OMP lack the authority, through voting rights or similar rights, to direct the activities that most significantly impact OMP’s economic performance. Therefore, as the limited partners of OMP do not have substantive kick-out or substantive participating rights over OMP GP, OMP is a variable interest entity. Through the Company’s ownership interest in OMP GP, the Company has the authority to direct the activities that most significantly affect economic performance and the right to receive benefits that could be potentially significant to OMP. Therefore, the Company is considered the primary beneficiary and consolidates OMP and records a non-controlling interest for the interest owned by the public. All intercompany balances and transactions have been eliminated upon consolidation. Revision of Prior Period Financial Statements. In connection with the preparation of the Company’s 2018 Annual Report, the Company identified errors in its previously issued 2017 annual consolidated financial statements and in each of the interim periods within 2018 and 2017. These prior period errors related to the manner in which it accounted for certain crude oil purchase and sale arrangements. Specifically, although the Company previously reported the transactions on a net basis, the Company was required to account for these purchase and sale arrangements on a gross basis, in accordance with Accounting Standards Codification 606, Revenue from Contracts with Customers (“ASC 606”) in 2018 , as these transactions were not subject to Accounting Standards Codification 845, Nonmonetary Transactions (“ASC 845”). The correction of these errors had no effect on the reported consolidated net income (loss) attributable to Oasis or earnings (loss) attributable to Oasis per share data. In accordance with Staff Accounting Bulletin (“SAB”) No. 99, Materiality , and SAB No. 108, Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements , the Company evaluated the errors and, based on an analysis of quantitative and qualitative factors, determined that the related impact was not material to the Company’s consolidated financial statements for any prior period. Therefore, amendments of previously filed reports are not required. In accordance with Accounting Standards Codification 250, Accounting Changes and Error Corrections , the Company has corrected the errors for the three and nine months ended September 30, 2018 by revising the unaudited condensed consolidated financial statements appearing herein. For the three and nine months ended September 30, 2018, the revision did not impact the Company’s financial position or cash flows from operations, and the impacts to the Company’s Condensed Consolidated Statement of Operations were as follows: Three Months Ended September 30, 2018 Nine Months Ended September 30, 2018 As Reported Revision As Revised As Reported Revision As Revised (In thousands, except per share data) Oil and gas revenues $ 452,643 $ 1,552 $ 454,195 $ 1,212,235 $ 6,404 $ 1,218,639 Purchased oil and gas sales 46,356 126,629 172,985 121,971 246,787 368,758 Total revenues 546,448 128,181 674,629 1,469,001 253,191 1,722,192 Purchased oil and gas expenses 46,088 128,181 174,269 121,251 253,191 374,442 Total operating expenses 404,272 128,181 532,453 1,458,468 253,191 1,711,659 Net income (loss) attributable to Oasis 62,341 — 62,341 (257,273) — (257,273) Income (loss) attributable to Oasis per share: Basic $ 0.20 $ — $ 0.20 $ (0.84) $ — $ (0.84) Diluted $ 0.20 $ — $ 0.20 $ (0.84) $ — $ (0.84) The accompanying notes to the condensed consolidated financial statements reflect the impact of this revision. Dividends The Company has not paid any cash dividends since its inception. Covenants contained in its revolving credit facilities and the indentures governing the Company’s senior notes restrict the payment of cash dividends on its common stock. The Company currently intends to retain all earnings for the development of its business and for repayment of outstanding debt, and the Company does not anticipate declaring or paying any cash dividends to holders of its common stock. Risks and Uncertainties As a crude oil and natural gas producer, the Company’s revenue, profitability and future growth are substantially dependent upon the prevailing and future prices for crude oil and natural gas, which are dependent upon numerous factors beyond its control such as economic, political and regulatory developments and competition from other energy sources. The energy markets have historically been very volatile, and there can be no assurance that crude oil and natural gas prices will not be subject to wide fluctuations in the future. A substantial or extended decline in prices for crude oil and, to a lesser extent, natural gas could have a material adverse effect on the Company’s financial position, results of operations, cash flows and quantities of crude oil and natural gas reserves that may be economically produced. Significant Accounting Policies There have been no material changes to the Company’s critical accounting policies and estimates from those disclosed in the 2018 Annual Report, other than as noted below. Leases. In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2016-02, Leases (Topic 842) , which requires lessees to recognize a right-of-use (“ROU”) asset and related liability on the balance sheet for leases with durations greater than twelve months and also requires certain quantitative and qualitative disclosures about leasing arrangements. Accounting Standards Codification 842, Leases (“ASC 842”), was subsequently amended by various Accounting Standards Updates, which provided additional implementation guidance. The Company adopted the new standard as of January 1, 2019 using the required modified retrospective approach and elected the option to recognize a cumulative effect adjustment of initially applying the guidance to the opening balance of retained earnings in the period of adoption. Prior period amounts were not adjusted. The Company elected the package of practical expedients under the transition guidance within the new standard, including the practical expedient to not reassess under the new standard any prior conclusions about lease identification, lease classification and initial direct costs; the use-of hindsight practical expedient; the practical expedient to not reassess the prior accounting treatment for existing or expired land easements; and the practical expedient pertaining to combining lease and non-lease components for all asset classes. In addition, the Company elected not to apply the recognition requirements of ASC 842 to leases with terms of one year or less, and as such, recognition of lease payments for short-term leases are recognized in net income on a straight line basis. See Note 17 — Leases for the adoption impact and disclosures required by ASC 842. Contingencies. Certain conditions may exist as of the date the Company’s consolidated financial statements are issued that may result in a loss to the Company, but which will only be resolved when one or more future events occur or fail to occur. The Company’s management, with input from legal counsel, assesses such contingent liabilities, and such assessment inherently involves judgment. In assessing loss contingencies related to legal proceedings that are pending against the Company or unasserted claims that may result in proceedings, the Company’s management, with input from legal counsel, evaluates the perceived merits of any legal proceedings or unasserted claims as well as the perceived merits of the amount of relief sought or expected to be sought therein. If the assessment of a contingency indicates that it is probable that a loss has been incurred and the amount of liability can be estimated, then the estimated undiscounted liability is accrued in the Company’s consolidated financial statements. If the assessment indicates that a potentially material loss contingency is not probable but is reasonably possible, or is probable but cannot be estimated, then the nature of the contingent liability, together with an estimate of the range of possible loss if determinable and material, is disclosed. Actual results could vary from these estimates and judgments. Loss contingencies considered remote are generally not disclosed unless they involve guarantees, in which case the guarantees would be disclosed. See Note 18 — Commitments and Contingencies for additional information regarding the Company’s contingencies. Recent Accounting Pronouncements Financial Instruments. In August 2018, the FASB issued Accounting Standards Update No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement (“ASU 2018-13”), which improves the effectiveness of the disclosure requirements for fair value measurements. The changes affect all companies that are required to include fair value measurement disclosures. ASU 2018-13 is effective for fiscal years beginning after December 15, 2019, including interim periods within those years. An entity is permitted to early adopt the removed or modified disclosures upon the issuance of ASU 2018-13 and may delay adoption of the additional disclosures until their effective date. The Company does not expect the adoption of this guidance to have an impact on its financial position, cash flows or results of operations, but it may result in changes to disclosures.

Oasis Midstream Partners

Oasis Midstream Partners	9 Months Ended
	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Oasis Midstream Partners	Oasis Midstream Partners 2019 Capital Expenditures Arrangement On February 22, 2019, the Company entered into a memorandum of understanding (the “MOU”) with OMP regarding the funding of Bobcat DevCo LLC’s (“Bobcat DevCo”) capital expenditures for the 2019 calendar year (the “2019 Capital Expenditures Arrangement”). Pursuant to the Amended and Restated Limited Liability Company Agreement of Bobcat DevCo LLC, as amended (the “First A&R Bobcat LLCA”), OMS and OMP are each required to make pro-rata capital contributions to Bobcat DevCo in accordance with their respective percentage ownership interests in Bobcat DevCo. Pursuant to the MOU, OMP agreed to make up to $80.0 million of capital contributions to Bobcat DevCo that OMS would otherwise be required to contribute under the First A&R Bobcat LLCA. In connection with execution of the MOU, OMS and OMP have amended the First A&R Bobcat LLCA and entered into the Second Amended and Restated Limited Liability Company Agreement of Bobcat DevCo LLC (the “Second A&R Bobcat LLCA”). The Second A&R Bobcat LLCA includes provisions applicable to the disproportionate capital contributions that OMP will make to Bobcat DevCo in connection with the 2019 Capital Expenditures Arrangement. Pursuant to the Second A&R Bobcat LLCA, upon the occurrence of a disproportionate capital contribution, the percentage interests of OMS and OMP in Bobcat DevCo will be adjusted to take into account the amount of the disproportionate capital contribution. During the three and nine months ended September 30, 2019, OMP made capital contributions to Bobcat DevCo pursuant to the 2019 Capital Expenditures Arrangement of $13.4 million and $66.2 million, respectively. As a result, OMS’s ownership interest in Bobcat DevCo decreased from 75% as of December 31, 2018 to 65.6% as of September 30, 2019. Assignment of midstream assets in Delaware Basin Effective November 1, 2019, the Company agreed to assign to Panther DevCo LLC (“Panther DevCo”), an indirect, wholly-owned subsidiary of OMP, certain crude oil gathering and produced water gathering and disposal assets (the “Delaware Midstream Assets”) under development to support the Company’s production in the Delaware Basin. OMP has agreed to reimburse the Company for all capital expenditures previously made with respect to the Delaware Midstream Assets, which is estimated to be approximately $25.0 million. OMP expects to fund this amount with borrowings under its revolving credit facility. Also, effective November 1, 2019, Panther DevCo entered into long-term commercial agreements with the Company, including a Crude Oil Gathering Agreement and a Produced Water Gathering and Disposal Agreement (collectively, the “Delaware Basin Commercial Agreements”), for crude oil and produced water midstream services in the Delaware Basin, which generally contain terms similar to those contained in the existing commercial agreements between OMP and the Company for midstream services in the Williston Basin. The Delaware Basin Commercial Agreements additionally provide the Company with certain purchase rights with respect to the Delaware Midstream Assets, and provide Panther DevCo with certain sale rights with respect to the Delaware Midstream Assets, in the event of a change of control of OMP or Panther DevCo, which purchase and sale rights will expire after two years.

Revenue Recognition

Revenue Recognition	9 Months Ended
	Sep. 30, 2019
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition Disaggregation of revenues Revenues associated with contracts with customers for crude oil, natural gas and natural gas liquids (“NGL”) sales were as follows for the three and nine months ended September 30, 2019 and 2018: Exploration and Production Revenues Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 (In thousands) Crude oil revenues $ 318,564 $ 414,082 $ 964,662 $ 1,103,575 Purchased crude oil sales 77,018 169,531 330,594 364,404 Natural gas and NGL revenues 25,906 40,113 105,594 115,064 Purchased natural gas sales 2,334 1,616 6,590 2,161 Total exploration and production revenues $ 423,822 $ 625,342 $ 1,407,440 $ 1,585,204 Revenues associated with contracts with customers for midstream services under fee-based arrangements and midstream product sales from purchase arrangements were as follows for the three and nine months ended September 30, 2019 and 2018: Midstream Revenues (1) Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 (In thousands) Midstream service revenues Crude oil and natural gas revenues $ 21,653 $ 18,188 $ 69,189 $ 54,124 Produced and flowback water revenues 10,803 9,985 29,309 27,919 Total midstream service revenues $ 32,456 $ 28,173 $ 98,498 $ 82,043 Midstream product revenues Purchased crude oil sales $ — $ 1,838 $ 28 $ 2,193 Natural gas and NGL revenues 16,424 — 46,541 — Freshwater revenues 1,143 3,014 4,578 6,408 Total midstream product revenues $ 17,567 $ 4,852 $ 51,147 $ 8,601 Total midstream revenues $ 50,023 $ 33,025 $ 149,645 $ 90,644 __________________ (1) Represents midstream revenues, excluding all intercompany revenues for work performed by the midstream services business segment for the Company’s ownership interests that are eliminated in consolidation and are therefore not included in consolidated midstream services revenues. Revenues associated with contracts with customers for well services were as follows for the three and nine months ended September 30, 2019 and 2018: Well Services Revenues (1) Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 (In thousands) Hydraulic fracturing revenues $ 8,228 $ 14,985 $ 28,631 $ 42,801 Equipment rental revenues 670 1,277 2,164 3,543 Total well services revenues $ 8,898 $ 16,262 $ 30,795 $ 46,344 __________________ (1) Represents well services revenues, excluding all intercompany revenues for work performed by the well services business segment for the Company’s ownership interests that are eliminated in consolidation and are therefore not included in consolidated well services revenues. Prior period performance obligations For sales of commodities, the Company records revenue in the month production is delivered to the purchaser. However, settlement statements and payment may not be received for 20 to 90 days after the date production is delivered, and as a result, the Company is required to estimate the amount of production that was delivered to the purchaser and the price that will be received for the sale of the product. The Company records the differences between estimates and the actual amounts received for product sales once payment is received from the purchaser. Such differences have historically not been significant. The Company uses knowledge of its properties, its properties’ historical performance, spot market prices and other factors as the basis for these estimates. For the three and nine months ended September 30, 2019 and 2018, revenue recognized related to performance obligations satisfied in prior reporting periods was not material. Contract balances Contract balances are the result of timing differences between revenue recognition, billings and cash collections. Contract liabilities are recorded for consideration received from customers primarily related to (i) temporary deficiency quantities under minimum volume commitments, which are recognized as revenue when the customer makes up the volumes or the deficiency makeup period expires and (ii) aid in construction payments received from customers which are recognized as revenue over the expected period of future benefit. The Company does not recognize contract assets or contract liabilities under its customer contracts for which invoicing occurs once the Company’s performance obligations have been satisfied and payment is unconditional. No material contract balances were recorded in the condensed consolidated financial statements at September 30, 2019 or December 31, 2018. Remaining performance obligations The following table presents estimated revenue allocated to remaining performance obligations for contracted revenues that are unsatisfied (or partially satisfied) as of September 30, 2019: (In thousands) 2019 (excluding the nine months ended September 30, 2019) $ 3,003 2020 20,501 2021 25,082 2022 19,259 2023 12,642 Thereafter 14,642 Total $ 95,129 The partially and wholly unsatisfied performance obligations presented in the table above are generally limited to customer contracts which have fixed pricing and fixed volume terms and conditions, which generally include customer contracts with minimum volume commitment payment obligations.

Inventory

Inventory	9 Months Ended
	Sep. 30, 2019
Inventory Disclosure [Abstract]
Inventory	Inventory Crude oil inventory includes crude oil in tanks and linefill. Linefill that represents the minimum volume of product in a pipeline system that enables the system to operate is generally not available to be withdrawn from the pipeline system until the expiration of the transportation contract. Crude oil linefill in third party pipelines that is not expected to be withdrawn within one year is included in long-term inventory on the Company’s Condensed Consolidated Balance Sheets. Equipment and materials consist primarily of proppant, chemicals, tubular goods, well equipment to be used in future drilling or repair operations, well fracturing equipment and spare parts and equipment for the Company’s midstream assets. Inventory, including long-term inventory, is stated at the lower of cost and net realizable value with cost determined on an average cost method. The Company assesses the carrying value of inventory and uses estimates and judgment when making any adjustments necessary to reduce the carrying value to net realizable value. Among the uncertainties that impact the Company’s estimates are the applicable quality and location differentials to include in the Company’s net realizable value analysis. Additionally, the Company estimates the upcoming liquidation timing of the inventory. Changes in assumptions made as to the timing of a sale can materially impact net realizable value. Total inventory consists of the following: September 30, 2019 December 31, 2018 (In thousands) Inventory Crude oil inventory $ 14,823 $ 14,933 Equipment and materials 21,935 18,195 Total inventory $ 36,758 $ 33,128 Long-term inventory Linefill in third party pipelines $ 14,395 $ 12,260 Total long-term inventory $ 14,395 $ 12,260 Total $ 51,153 $ 45,388

Accounts Receivable

Accounts Receivable	9 Months Ended
	Sep. 30, 2019
Receivables [Abstract]
Accounts Receivable	Accounts Receivable The following table sets forth the Company’s accounts receivable, net: September 30, 2019 December 31, 2018 (In thousands) Trade accounts $ 262,966 $ 245,546 Joint interest accounts 107,254 133,375 Other accounts 13,014 10,207 Total 383,234 389,128 Allowance for doubtful accounts (1,617) (1,526) Total accounts receivable, net $ 381,617 $ 387,602

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements In accordance with the FASB’s authoritative guidance on fair value measurements, the Company’s financial assets and liabilities are measured at fair value on a recurring basis. The Company’s financial instruments, including certain cash and cash equivalents, accounts receivable, accounts payable and other payables, are carried at cost, which approximates their respective fair market values due to their short-term maturities. The Company recognizes its non-financial assets and liabilities, such as asset retirement obligations (“ARO”) and proved oil and natural gas properties upon impairment, at fair value on a non-recurring basis. As defined in the authoritative guidance, fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price). To estimate fair value, the Company utilizes market data or assumptions that market participants would use in pricing the asset or liability, including assumptions about risk and the risks inherent in the inputs to the valuation technique. These inputs can be readily observable, market corroborated or generally unobservable. The authoritative guidance establishes a fair value hierarchy that prioritizes the inputs used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (“Level 1” measurements) and the lowest priority to unobservable inputs (“Level 3” measurements). The three levels of the fair value hierarchy are as follows: Level 1 — Unadjusted quoted prices are available in active markets for identical assets or liabilities as of the reporting date. Active markets are those in which transactions for the asset or liability occur in sufficient frequency and volume to provide pricing information on an ongoing basis. Level 2 — Pricing inputs, other than unadjusted quoted prices in active markets included in Level 1, are either directly or indirectly observable as of the reporting date. Level 2 includes those financial instruments that are valued using models or other valuation methodologies. These models are primarily industry-standard models that consider various assumptions, including quoted forward prices for commodities, time value, volatility factors and current market and contractual prices for the underlying instruments, as well as other relevant economic measures. Substantially all of these assumptions are observable in the marketplace throughout the full term of the instrument and can be derived from observable data or are supported by observable levels at which transactions are executed in the marketplace. Level 3 — Pricing inputs are generally less observable from objective sources, requiring internally developed valuation methodologies that result in management’s best estimate of fair value. Financial Assets and Liabilities Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input requires judgment and may affect the valuation of fair value assets and liabilities and their placement within the fair value hierarchy levels. The following tables set forth by level, within the fair value hierarchy, the Company’s financial assets and liabilities that were accounted for at fair value on a recurring basis: Fair value at September 30, 2019 Level 1 Level 2 Level 3 Total (In thousands) Assets: Money market funds $ 145 $ — $ — $ 145 Commodity derivative instruments (see Note 8) — 61,909 — 61,909 Total assets $ 145 $ 61,909 $ — $ 62,054 Liabilities: Commodity derivative instruments (see Note 8) $ — $ 830 $ — $ 830 Total liabilities $ — $ 830 $ — $ 830 Fair value at December 31, 2018 Level 1 Level 2 Level 3 Total (In thousands) Assets: Money market funds $ 143 $ — $ — $ 143 Commodity derivative instruments (see Note 8) — 106,875 — 106,875 Total assets $ 143 $ 106,875 $ — $ 107,018 Liabilities: Commodity derivative instruments (see Note 8) $ — $ 104 $ — $ 104 Total liabilities $ — $ 104 $ — $ 104 The Level 1 instruments presented in the tables above consist of money market funds included in cash and cash equivalents on the Company’s Condensed Consolidated Balance Sheets at September 30, 2019 and December 31, 2018. The Company’s money market funds represent cash equivalents backed by the assets of high-quality major banks and financial institutions. The Company identifies the money market funds as Level 1 instruments because the money market funds have daily liquidity, quoted prices for the underlying investments can be obtained, and there are active markets for the underlying investments. The Level 2 instruments presented in the tables above consist of commodity derivative instruments, which include crude oil and natural gas swaps and collars. The fair values of the Company’s commodity derivative instruments are based upon a third party preparer’s calculation using mark-to-market valuation reports provided by the Company’s counterparties for monthly settlement purposes to determine the valuation of its derivative instruments. The Company has the third party preparer evaluate other readily available market prices for its derivative contracts, as there is an active market for these contracts. The third party preparer performs its independent valuation using a moment matching method similar to Turnbull-Wakeman for Asian options. The significant inputs used are crude oil prices, volatility, skew, discount rate and the contract terms of the derivative instruments. The Company compares the third party preparer’s valuation to counterparty valuation statements, investigating any significant differences, and analyzes monthly valuation changes in relation to movements in crude oil and natural gas forward price curves. The determination of the fair value for derivative instruments also incorporates a credit adjustment for non-performance risk, as required by GAAP. The Company calculates the credit adjustment for derivatives in a net asset position using current credit default swap values for each counterparty. The credit adjustment for derivatives in a net liability position is based on the Company’s market credit spread. Based on these calculations, the Company recorded an adjustment to reduce the fair value of its net derivative asset by $0.1 million at September 30, 2019 and by $0.2 million at December 31, 2018.

Derivative Instruments

Derivative Instruments	9 Months Ended
	Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	Derivative Instruments The Company utilizes derivative financial instruments to manage risks related to changes in crude oil and natural gas prices. The Company’s crude oil contracts will settle monthly based on the average NYMEX West Texas Intermediate crude oil index price (“NYMEX WTI”) and the average Argus WTI Houston crude oil index price (“Houston”). The Company’s natural gas contracts will settle monthly based on the average NYMEX Henry Hub natural gas index price (“NYMEX HH”). At September 30, 2019, the Company utilized fixed price swaps, basis swaps and two-way and three-way costless collars to reduce the volatility of crude oil and natural gas prices on a significant portion of its future expected crude oil and natural gas production. The Company’s fixed price swaps are comprised of a sold call and a purchased put established at the same price (both ceiling and floor), which the Company will receive for the volumes under contract. A basis swap transaction has an established fixed basis differential corresponding to two floating index prices. Depending on the difference of the two floating index prices in relation to the fixed basis differential, the Company either receives an amount from its counterparty, or pays an amount to its counterparty, equal to the difference multiplied by the hedged contract volume. A two-way collar is a combination of options: a sold call and a purchased put. The purchased put establishes a minimum price (floor) and the sold call establishes a maximum price (ceiling) the Company will receive for the volumes under contract. A three-way collar is a combination of options: a sold call, a purchased put and a sold put. The purchased put establishes a minimum price (floor), unless the market price falls below the sold put (sub-floor), at which point the minimum price would be the index price plus the difference between the purchased put and the sold put strike price. The sold call establishes a maximum price (ceiling) the Company will receive for the volumes under contract. All derivative instruments are recorded on the Company’s Condensed Consolidated Balance Sheets as either assets or liabilities measured at its fair value (see Note 7 — Fair Value Measurements). The Company has not designated any derivative instruments as hedges for accounting purposes and does not enter into such instruments for speculative trading purposes. If a derivative does not qualify as a hedge or is not designated as a hedge, the changes in fair value are recognized in the other income (expense) section of the Company’s Condensed Consolidated Statements of Operations as a net gain or loss on derivative instruments. The Company’s cash flow is only impacted when the actual settlements under the derivative contracts result in making a payment to or receiving a payment from the counterparty. These cash settlements represent the cumulative gains and losses on the Company’s derivative instruments and do not include a recovery of costs that were paid to acquire or modify the derivative instruments that were settled. Cash settlements are reflected as investing activities in the Company’s Condensed Consolidated Statements of Cash Flows. At September 30, 2019, the Company had the following outstanding commodity derivative instruments: Commodity Settlement Derivative Index Volumes Weighted Average Prices Fair Value Fixed Price Swaps Basis Swaps Sub-Floor Floor Ceiling (In thousands) Crude oil 2019 Fixed price swaps NYMEX WTI 2,275,000 Bbl $ 57.49 $ 5,744 Crude oil 2019 Basis swaps Houston-NYMEX WTI 90,000 Bbl $ 4.55 142 Crude oil 2019 Two-way collar NYMEX WTI 1,274,000 Bbl $ 58.07 $ 74.64 5,002 Crude oil 2019 Three-way collar NYMEX WTI 1,092,000 Bbl $ 40.00 $ 51.57 $ 65.40 768 Crude oil 2020 Fixed price swaps NYMEX WTI 3,418,000 Bbl $ 58.69 21,461 Crude oil 2020 Two-way collar NYMEX WTI 2,378,000 Bbl $ 52.11 $ 62.98 7,609 Crude oil 2020 Three-way collar NYMEX WTI 4,574,000 Bbl $ 40.00 $ 53.26 $ 64.48 15,871 Crude oil 2021 Fixed price swaps NYMEX WTI 93,000 Bbl $ 58.85 770 Crude oil 2021 Two-way collar NYMEX WTI 62,000 Bbl $ 50.50 $ 60.70 245 Crude oil 2021 Three-way collar NYMEX WTI 734,000 Bbl $ 40.00 $ 51.26 $ 64.05 2,101 Natural gas 2019 Fixed price swaps NYMEX HH 2,760,000 MMBtu $ 2.92 1,366 $ 61,079 Subsequent to September 30, 2019, the Company entered into additional fixed price swaps and two-way collar options for crude oil with a weighted average floor price of $54.25 per Bbl. The commodity contracts included total notional amounts of 2,005,200 Bbls and 74,400 Bbls, which settle in 2020 and 2021, respectively, based on NYMEX WTI. These derivative instruments do not qualify for or were not designated as hedging instruments for accounting purposes. The following table summarizes the location and amounts of gains and losses from the Company’s commodity derivative instruments recorded in the Company’s Condensed Consolidated Statements of Operations for the periods presented: Three Months Ended September 30, Nine Months Ended September 30, Statements of Operations Location 2019 2018 2019 2018 (In thousands) Net gain (loss) on derivative instruments $ 47,922 $ (48,544) $ (34,940) $ (239,945) In accordance with the FASB’s authoritative guidance on disclosures about offsetting assets and liabilities, the Company is required to disclose both gross and net information about instruments and transactions eligible for offset in the statement of financial position as well as instruments and transactions subject to an agreement similar to a master netting agreement. The Company’s derivative instruments are presented as assets and liabilities on a net basis by counterparty, as all counterparty contracts provide for net settlement. No margin or collateral balances are deposited with counterparties, and as such, gross amounts are offset to determine the net amounts presented in the Company’s Condensed Consolidated Balance Sheets. The following table summarizes the location and fair value of all outstanding commodity derivative instruments recorded in the Company’s Condensed Consolidated Balance Sheets: September 30, 2019 Commodity Balance Sheet Location Gross Recognized Assets/Liabilities Gross Amount Offset Net Recognized Fair Value Assets/ Liabilities (In thousands) Derivatives assets: Commodity contracts Derivative instruments — current assets $ 63,743 $ (11,563) $ 52,180 Commodity contracts Derivative instruments — non-current assets 16,263 (6,534) 9,729 Total derivatives assets $ 80,006 $ (18,097) $ 61,909 Derivatives liabilities: Commodity contracts Derivative instruments — current liabilities $ 1,428 $ (598) $ 830 Commodity contracts Derivative instruments — non-current liabilities — — — Total derivatives liabilities $ 1,428 $ (598) $ 830 December 31, 2018 Commodity Balance Sheet Location Gross Recognized Assets/Liabilities Gross Amount Offset Net Recognized Fair Value Assets/Liabilities (In thousands) Derivatives assets: Commodity contracts Derivative instruments — current assets $ 110,729 $ (10,799) $ 99,930 Commodity contracts Derivative instruments — non-current assets 8,251 (1,306) 6,945 Total derivatives assets $ 118,980 $ (12,105) $ 106,875 Derivatives liabilities: Commodity contracts Derivative instruments — current liabilities $ 84 $ — $ 84 Commodity contracts Derivative instruments — non-current liabilities 20 — 20 Total derivatives liabilities $ 104 $ — $ 104

Property, Plant and Equipment

Property, Plant and Equipment	9 Months Ended
	Sep. 30, 2019
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, Plant and Equipment The following table sets forth the Company’s property, plant and equipment: September 30, 2019 December 31, 2018 (In thousands) Proved oil and gas properties (1) $ 8,550,060 $ 7,878,104 Less: Accumulated depreciation, depletion, amortization and impairment (3,400,802) (2,853,353) Proved oil and gas properties, net 5,149,258 5,024,751 Unproved oil and gas properties 824,446 1,034,085 Other property and equipment (2) 1,339,268 1,151,772 Less: Accumulated depreciation (223,362) (183,499) Other property and equipment, net 1,115,906 968,273 Total property, plant and equipment, net $ 7,089,610 $ 7,027,109 __________________ (1) Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $42.2 million and $40.5 million at September 30, 2019 and December 31, 2018, respectively. (2) Included in the Company’s other property and equipment are estimates of future asset retirement costs of $1.4 million and $1.3 million at September 30, 2019 and December 31, 2018, respectively.

Divestitures and Assets Held fo

Divestitures and Assets Held for Sale	9 Months Ended
	Sep. 30, 2019
Discontinued Operations and Disposal Groups [Abstract]
Divestitures and Assets Held for Sale	Divestitures and Assets Held for Sale Divestitures The Company reviews portfolio opportunities on an ongoing basis and has engaged in various divestiture transactions over recent years. During the nine months ended September 30, 2019, the Company completed the final closing statements for the sale of non-strategic oil and gas properties and certain other property and equipment primarily located in the Foreman Butte area of the Williston Basin. The Company recognized an additional $3.2 million net loss on sale of properties, which includes customary closing adjustments, in its Condensed Consolidated Statements of Operations for the nine months ended September 30, 2019. In addition, the Company also sold partial interests in certain oil and gas properties in the Company’s exploration and production segment. During the three and nine months ended September 30, 2019, the Company recognized a $0.7 million net loss on sale of properties, which includes customary closing adjustments, in its Condensed Consolidated Statements of Operations. Assets Held for Sale Assets and liabilities held for sale represent the assets that are expected to be sold and the liabilities that are expected to be assumed by the purchaser, respectively. In October 2019, the Company completed the closings for two separate purchase and sale agreements to sell partial interests in certain non-operated oil and gas properties in the Williston Basin (the “2019 Divestitures”), which includes reimbursements for exploration and production capital expenditures of $6.7 million for the three and nine months ended September 30, 2019 and total cash proceeds of $0.5 million. The assets and liabilities held for sale are in the Company’s exploration and production segment. The transactions had effective dates of January 1, 2019 and June 1, 2019, and the final closing statements for the transactions were completed in October 2019. Upon closing these transactions, the Company recognized a $0.5 million net gain on sale of properties, which includes customary closing adjustments, subsequent to the quarter ended September 30, 2019. The assets and liabilities sold in the 2019 Divestitures were classified as held for sale as of September 30, 2019. The Company did not have any assets or liabilities classified as held for sale as of December 31, 2018. The following table presents balance sheet data related to the assets and liabilities held for sale related to the 2019 Divestitures as of September 30, 2019: September 30, 2019 (In thousands) Assets: Oil and gas properties (successful efforts method) $ 6,700 Less: accumulated depreciation, depletion, amortization and impairment — Total assets held for sale, net $ 6,700 Liabilities: Accrued liabilities $ 6,700 Total liabilities held for sale $ 6,700

Long-Term Debt

Long-Term Debt	9 Months Ended
	Sep. 30, 2019
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt The Company’s long-term debt consists of the following: September 30, 2019 December 31, 2018 (In thousands) Oasis Credit Facility $ 406,000 $ 468,000 OMP Credit Facility 431,000 318,000 Senior unsecured notes 6.50% senior unsecured notes due November 1, 2021 71,835 71,835 6.875% senior unsecured notes due March 15, 2022 901,480 901,480 6.875% senior unsecured notes due January 15, 2023 366,094 366,094 6.25% senior unsecured notes due May 1, 2026 400,000 400,000 2.625% senior unsecured convertible notes due September 15, 2023 300,000 300,000 Total principal of senior unsecured notes 2,039,409 2,039,409 Less: unamortized deferred financing costs on senior unsecured notes (17,309) (20,865) Less: unamortized debt discount on senior unsecured convertible notes (60,241) (69,268) Total long-term debt $ 2,798,859 $ 2,735,276 Senior secured revolving line of credit. The Company has a senior secured revolving line of credit among OPNA, as borrower, Wells Fargo Bank, N.A., as administrative agent and the lenders party thereto (the “Oasis Credit Facility”) with an overall senior secured line of credit of $3,000.0 million as of September 30, 2019, which has a maturity date of the earlier of (i) October 16, 2023, (ii) 90 days prior to the maturity date of the Company’s senior unsecured notes due in 2022 and 2023, of which $1,267.6 million is outstanding, to the extent such senior unsecured notes are not retired or refinanced to have a maturity date at least 90 days after October 16, 2023 and (iii) 90 days prior to the maturity date of the Company’s senior unsecured convertible notes due in 2023, of which $300.0 million is outstanding, to the extent such senior unsecured convertible notes are not retired, converted, redeemed or refinanced to have a maturity date at least 90 days after October 16, 2023. The Oasis Credit Facility is restricted to a borrowing base, which is reserve-based and subject to semi-annual redeterminations on April 1 and October 1 of each year. On April 15, 2019, the lenders under the Oasis Credit Facility completed their regular semi-annual redetermination of the borrowing base scheduled for April 1, 2019, which reaffirmed the borrowing base and the aggregate elected commitment at $1,600.0 million and $1,350.0 million, respectively. In connection with the April 1, 2019 borrowing base redetermination, the Company entered into the First Amendment to the Third Amended and Restated Credit Agreement to the Oasis Credit Facility, dated April 15, 2019, which, among other things, incorporated the ability for the Company to request swingline loans subject to a swingline loans sublimit of $50.0 million. On November 4, 2019, the lenders under the Oasis Credit Facility completed their regular semi-annual redetermination of its borrowing base scheduled for October 1, 2019. As a result, the Company’s borrowing base decreased from $1,600.0 million to $1,300.0 million. The next redetermination of the Oasis Credit Facility’s borrowing base is scheduled for April 1, 2020. Additionally, the Company entered into the third amendment to the Oasis Credit Facility, which decreased the Company’s aggregate elected commitment from $1,350.0 million to $1,100.0 million. At September 30, 2019, the Company had $406.0 million of London Interbank Offered Rate (“LIBOR”) loans at a weighted average interest rate of 3.8% and $14.0 million of outstanding letters of credit issued under the Oasis Credit Facility, resulting in an unused borrowing base committed capacity of $930.0 million. On a quarterly basis, the Company also pays a commitment fee that can range from 0.375% to 0.500% on the average amount of borrowing base capacity not utilized during the quarter and fees calculated on the average amount of letter of credit balances outstanding during the quarter. The Company was in compliance with the financial covenants of the Oasis Credit Facility as of September 30, 2019. OMP Operating LLC revolving line of credit. Through its ownership of OMP, the Company has access to a senior secured revolving credit facility among OMP, as parent, OMP Operating LLC, a subsidiary of OMP, as borrower, Wells Fargo Bank, N.A., as administrative agent and the lenders party thereto (the “OMP Credit Facility,” and, together with the Oasis Credit Facility, the “Revolving Credit Facilities”). The OMP Credit Facility is available to fund working capital and to finance acquisitions and other capital expenditures of OMP. On May 6, 2019, OMP entered into an amendment to the OMP Credit Facility to (i) increase the aggregate amount of commitments from $400.0 million to $475.0 million; (ii) provide for the ability to further increase commitments to $675.0 million; and (iii) add a new lender to the bank group. On August 16, 2019, OMP entered into the third amendment to the OMP Credit Facility to (i) increase the aggregate amount of commitments from $475.0 million to $575.0 million and (ii) provide for the ability to further increase commitments to $775.0 million. As of September 30, 2019, the OMP Credit Facility has an aggregate amount of commitments of $575.0 million and has a maturity date of September 25, 2022. At September 30, 2019, the Company had $431.0 million of borrowings outstanding under the OMP Credit Facility at a weighted average interest rate of 4.1%, and $8.2 million of outstanding letters of credit, resulting in an unused borrowing base capacity of $135.8 million. The unused portion of the OMP Credit Facility is subject to a commitment fee ranging from 0.375% to 0.500%. The Company was in compliance with the financial covenants under the OMP Credit Facility at September 30, 2019. The Revolving Credit Facilities are recorded at values that approximate fair value since their variable interest rates are tied to current market rates. Senior unsecured notes. At September 30, 2019, the Company had $1,739.4 million principal amount of senior unsecured notes outstanding with maturities ranging from November 2021 to May 2026 and coupons ranging from 6.25% to 6.875% (the “Senior Notes”). Prior to certain dates, the Company has the option to redeem some or all of the Senior Notes for cash at certain redemption prices equal to a certain percentage of their principal amount plus an applicable make-whole premium and accrued and unpaid interest to the redemption date. Senior unsecured convertible notes. At September 30, 2019, the Company had $300.0 million of 2.625% senior unsecured convertible notes due September 2023 (the “Senior Convertible Notes”). The Company has the option to settle conversions of these notes with cash, shares of common stock or a combination of cash and common stock at its election. The Company’s intent is to settle the principal amount of the Senior Convertible Notes in cash upon conversion. Prior to March 15, 2023, the Senior Convertible Notes will be convertible only under the following circumstances: (i) during any calendar quarter commencing after the calendar quarter ending on September 30, 2016 (and only during such calendar quarter), if the last reported sale price of the Company’s common stock for at least 20 trading days (whether or not consecutive) during the period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day; (ii) during the five business day period after any five consecutive trading day period (the “Measurement Period”) in which the trading price per $1,000 principal amount of the Senior Convertible Notes for each trading day of the Measurement Period is less than 98% of the product of the last reported sale price of the Company’s common stock and the conversion rate on each such trading day; or (iii) upon the occurrence of specified corporate events, including certain distributions or a fundamental change. On or after March 15, 2023, the Senior Convertible Notes will be convertible at any time until the second scheduled trading day immediately preceding their September 15, 2023 maturity date. The Senior Convertible Notes will be convertible at an initial conversion rate of 76.3650 shares of the Company’s common stock per $1,000 principal amount of the Senior Convertible Notes, which is equivalent to an initial conversion price of approximately $13.10. The conversion rate will be subject to adjustment in some events but will not be adjusted for any accrued and unpaid interest. In addition, following certain corporate events that occur prior to the maturity date or a notice of redemption, the Company will increase the conversion rate for a holder who elects to convert its Senior Convertible Notes in connection with such corporate event or redemption in certain circumstances. As of September 30, 2019, none of the contingent conditions allowing holders of the Senior Convertible Notes to convert these notes had been met. In addition, the Company was in compliance with the terms of the indentures for the Senior Convertible Notes as of September 30, 2019.

Asset Retirement Obligations

Asset Retirement Obligations	9 Months Ended
	Sep. 30, 2019
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligations	Asset Retirement Obligations The following table reflects the changes in the Company’s ARO during the nine months ended September 30, 2019: (In thousands) Balance at December 31, 2018 $ 52,449 Liabilities incurred during period 1,436 Liabilities settled during period (644) Accretion expense during period (1) 2,187 Revisions to estimates 647 Balance at September 30, 2019 $ 56,075 ___________________ (1) Included in depreciation, depletion and amortization on the Company’s Condensed Consolidated Statements of Operations. At September 30, 2019, the current portion of the total ARO balance was approximately $0.6 million and was included in accrued liabilities on the Company’s Condensed Consolidated Balance Sheet.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company’s effective tax rate for the three and nine months ended September 30, 2019 was (134.3)% on a pre-tax income of $12.9 million and 25.0% on a pre-tax loss of $35.3 million, respectively, as compared to an effective tax rate of 27.2% on a pre-tax income of $91.0 million and 23.4% on a pre-tax loss of $321.8 million for the three and nine months ended September 30, 2018, respectively. The effective tax rate for the three months ended September 30, 2019 was lower than the statutory federal rate of 21% primarily due to the impact of non-controlling interests, partially offset by state income taxes and the impact of other permanent differences, primarily non-deductible executive compensation . The effective tax rate for the nine months ended September 30, 2019 was higher than the statutory federal rate of 21% primarily due to the impacts of non-controlling interests and state income taxes. These increases were offset by other permanent differences, primarily non-deductible executive compensation and equity-based compensation shortfalls. The effective tax rate for the three months ended September 30, 2018 was higher than the statutory federal rate of 21% primarily due to state income taxes and the impact of non-deductible executive compensation. The effective tax rate for the nine months ended September 30, 2018 was higher than the statutory rate primarily due to state income taxes and the impact of a decrease in the Company’s deferred state tax rate, partially offset by the impact of non-deductible executive compensation.

Equity-Based Compensation

Equity-Based Compensation	9 Months Ended
	Sep. 30, 2019
Share-based Payment Arrangement [Abstract]
Equity-Based Compensation	Equity-Based Compensation Restricted stock awards. The Company has granted restricted stock awards to employees and directors under its Amended and Restated 2010 Long Term Incentive Plan, the majority of which vest over a three During the nine months ended September 30, 2019, employees and non-employee directors of the Company were granted restricted stock awards equal to 4,051,325 shares of common stock with a $6.62 weighted average grant date per share value. Equity-based compensation expense recorded for restricted stock awards was $5.8 million and $18.4 million for the three and nine months ended September 30, 2019, respectively, and $5.1 million and $14.7 million for the three and nine months ended September 30, 2018, respectively. Equity-based compensation expense is included in general and administrative expenses on the Company’s Condensed Consolidated Statements of Operations. Performance share units. The Company has granted performance share units (“PSUs”) to officers of the Company under its Amended and Restated 2010 Long Term Incentive Plan. The PSUs are awards of restricted stock units, and each PSU that is earned represents the right to receive one share of the Company’s common stock. The Company accounts for PSUs as equity awards pursuant to the FASB’s authoritative guidance for share-based payments. The number of PSUs to be earned is subject to a market condition, which is based on a comparison of the total shareholder return (“TSR”) achieved with respect to shares of the Company’s common stock against the TSR achieved by a defined peer group at the end of the performance periods. Depending on the Company’s TSR performance relative to the defined peer group, award recipients will earn between 0% and 200% of the initial PSUs granted. All compensation expense related to the PSUs will be recognized if the requisite performance period is fulfilled, even if the market condition is not achieved. The aggregate grant date fair value of the market-based awards was determined using a Monte Carlo simulation model. The Monte Carlo simulation model uses assumptions regarding random projections and must be repeated numerous times to achieve a probabilistic assessment. The key valuation assumptions for the Monte Carlo model are the forecast period, initial value, stock price on the date of grant, risk-free interest rate, volatility and correlation coefficients. The risk-free interest rates are the U.S. Treasury bond rates on the date of grant that correspond to each performance period. The initial value is the average of the volume weighted average prices for the 30 trading days prior to the start of the performance cycle for the Company and each of its peers. Volatility was calculated from the daily historical returns of stock prices over a historical period for the Company and each of its peers. The correlation coefficients are measures of the strength of the linear relationship between and amongst the Company and its peers estimated based on historical stock price data. The following assumptions were used for the Monte Carlo model to determine the grant date fair value and associated equity-based compensation expense of the PSUs granted during the nine months ended September 30, 2019: Risk-free interest rate 2.55% - 2.56% Oasis volatility 71.17 % Oasis initial value $5.85 Oasis stock price on date of grant $6.63 During the nine months ended September 30, 2019, officers of the Company were granted 1,685,090 PSUs with a $6.80 weighted average grant date per unit value. Equity-based compensation expense recorded for PSUs was $2.5 million and $7.5 million for the three and nine months ended September 30, 2019, respectively, and $2.2 million and $6.3 million for the three and nine months ended September 30, 2018, respectively. Equity-based compensation e xpense is included in general and administrative expenses on the Company’s Condensed Consolidated Statements of Operations. OMP phantom unit awards . The Company has granted OMP phantom unit awards (collectively, the “OMP Phantom Unit Awards,” and each an “OMP Phantom Unit”) to employees under its Amended and Restated 2010 Long Term Incentive Plan in 2018 and 2019, and in 2017, under OMP GP’s Oasis Midstream Partners LP 2017 Long Term Incentive Plan. Each OMP Phantom Unit represents the right to receive, upon vesting of the award, a cash payment equal to the fair market value of one OMP common unit on the day prior to the date it vests (the “Vesting Date”). Award recipients are also entitled to Distribution Equivalent Rights (“DER”) with respect to each OMP Phantom Unit received. Each DER represents the right to receive, upon vesting of the award, a cash payment equal to the value of the distributions paid on one OMP common unit between the grant date and the applicable Vesting Date. The OMP Phantom Unit Awards vest in equal amounts each year over a three The OMP Phantom Unit Awards are accounted for as liability-classified awards since the awards will settle in cash, and equity-based compensation expense is accounted for under the fair value method in accordance with GAAP. Under the fair value method for liability-classified awards, compensation expense is remeasured each reporting period at fair value based upon the closing price of a publicly traded common unit. The Company will directly pay, or will reimburse OMP, for the cash settlement amount of these awards. During the nine months ended September 30, 2019, the Company granted 341,290 OMP Phantom Unit Awards to certain employees of Oasis with a weighted average grant date fair value of $18.57 per unit. Equity-based compensation expense recorded for the OMP Phantom Unit Awards was $0.1 million and $1.8 million for the three and nine months ended September 30, 2019, respectively, and $0.2 million and $0.4 million for the three and nine months ended September 30, 2018 , respectively, and is included in general and administrative expenses on the Company’s Condensed Consolidated Statements of Operations. one

Earnings (Loss) Per Share

Earnings (Loss) Per Share	9 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
Earnings (Loss) Per Share	Earnings (Loss) Per ShareBasic earnings (loss) per share is computed by dividing the earnings (loss) attributable to Oasis common stockholders by the weighted average number of shares outstanding for the periods presented. The calculation of diluted earnings (loss) per share includes the potential dilutive impact of unvested restricted stock awards and contingently issuable shares related to PSUs and the Senior Convertible Notes during the periods presented, unless its effect is anti-dilutive. There are no adjustments made to the income (loss) attributable to Oasis available to common stockholders in the calculation of diluted earnings (loss) per share. The following is a calculation of the basic and diluted weighted average shares outstanding for the three and nine months ended September 30, 2019 and 2018: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 (In thousands) Basic and diluted weighted average common shares outstanding 315,135 313,167 314,863 305,533 Dilutive effect of restricted stock awards and PSUs (1) — 3,220 — — Diluted weighted average common shares outstanding 315,135 316,387 314,863 305,533 ___________________ (1) No unvested stock awards were included in computing earnings (loss) per share for the three and nine months ended September 30, 2019 and for the nine months ended September 30, 2018 because the effects were anti-dilutive. For the nine months ended September 30, 2019 and 2018, respectively, the Company incurred a net loss, and therefore the diluted loss per share calculation for the period excludes the anti-dilutive effect of unvested stock awards. In addition, the diluted earnings per share calculation for the three months ended September 30, 2019 and 2018, respectively, exclude the dilutive effect of unvested stock awards that were anti-dilutive under the treasury stock method. The following is a calculation of weighted average common shares excluded from diluted earnings (loss) per share due to the anti-dilutive effect: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 (In thousands) Restricted stock awards and PSUs 9,825 4,180 10,106 7,284 The Company issued its Senior Convertible Notes in September 2016 (see Note 11 — Long-Term Debt). The Company has the option to settle conversions of its Senior Convertible Notes with cash, shares of common stock or a combination of cash and common stock at its election. The Company’s intent is to settle the principal amount of the Senior Convertible Notes in cash upon conversion. As a result, only the amount by which the conversion value exceeds the aggregate principal amount of the notes (conversion spread) is considered in the diluted earnings per share computation under the treasury stock method. As of September 30, 2019 and 2018 , the conversion value did not exceed the principal amount of the notes, and accordingly, there was no impact to diluted earnings per share for the three and nine months ended September 30, 2019 and 2018

Business Segment Information

Business Segment Information	9 Months Ended
	Sep. 30, 2019
Segment Reporting [Abstract]
Business Segment Information	Business Segment Information The Company’s exploration and production segment is engaged in the acquisition and development of oil and natural gas properties. Revenues for the exploration and production segment are derived from the sale of crude oil and natural gas production. The Company’s midstream services business segment performs produced and flowback water gathering and disposal services, fresh water services, natural gas gathering and processing and crude oil gathering and transportation and other midstream services for crude oil and natural gas wells operated by the Company as well as third-party operated wells. Revenues for the midstream segment are primarily derived from produced and flowback water pipeline transport, produced and flowback water disposal, fresh water sales, natural gas gathering and processing and crude oil gathering, blending, stabilization and transportation. The Company’s well services business segment performs completion services for the Company’s crude oil and natural gas wells. Revenues for the well services segment are derived from providing well services, product sales and equipment rentals. The revenues and expenses related to work performed by OMP, OMS and OWS for the Company’s ownership interests are eliminated in consolidation, and only the revenues and expenses related to non-affiliated working interest owners are included in the Company’s Condensed Consolidated Statements of Operations. These segments represent the Company’s three operating units, each offering different products and services. The Company’s corporate activities have been allocated to the supported business segments accordingly. Management evaluates the performance of the Company’s business segments based on operating income, which is defined as segment operating revenues less operating expenses, including depreciation, depletion and amortization (“DD&A”). For the three and nine months ended September 30, 2018, the Company has revised the condensed consolidated financial statements and business segment financial information to reflect the correction of errors related to the manner in which it accounted for certain crude oil purchase and sale arrangements, which are included in the Company’s exploration and production segment and had no effect on operating income. Please see Note 2 — Summary of Significant Accounting Policies for more information related to the revision. The following table summarizes financial information for the Company’s three business segments for the periods presented: Exploration and Midstream Services Well Services Eliminations Consolidated (In thousands) Three months ended September 30, 2019: Revenues from non-affiliates $ 423,822 $ 50,023 $ 8,898 $ — $ 482,743 Inter-segment revenues — 73,388 21,511 (94,899) — Total revenues 423,822 123,411 30,409 (94,899) 482,743 Operating income (loss) (51,476) 64,299 236 (4,618) 8,441 Other income (expense), net 8,871 (4,512) 139 — 4,498 Income (loss) before income taxes including non-controlling interests $ (42,605) $ 59,787 $ 375 $ (4,618) $ 12,939 General and administrative $ 46,377 $ 7,842 $ 6,489 $ (7,848) $ 52,860 Equity-based compensation 8,246 383 42 (225) 8,446 Three months ended September 30, 2018: Revenues from non-affiliates $ 625,342 $ 33,025 $ 16,262 $ — $ 674,629 Inter-segment revenues — 42,745 40,177 (82,922) — Total revenues 625,342 75,770 56,439 (82,922) 674,629 Operating income 146,969 31,326 9,237 (8,487) 179,045 Other expense, net (87,594) (367) (79) — (88,040) Income before income taxes including non-controlling interests $ 59,375 $ 30,959 $ 9,158 $ (8,487) $ 91,005 General and administrative $ 30,454 $ 5,614 $ 5,437 $ (6,646) $ 34,859 Equity-based compensation 7,102 442 354 (442) 7,456 Nine months ended September 30, 2019: Revenues from non-affiliates $ 1,407,440 $ 149,645 $ 30,795 $ — $ 1,587,880 Inter-segment revenues — 199,793 71,526 (271,319) — Total revenues 1,407,440 349,438 102,321 (271,319) 1,587,880 Operating income (loss) (30,657) 169,321 2,538 (10,745) 130,457 Other income (expense), net (153,481) (12,460) 156 — (165,785) Income (loss) before income taxes including non-controlling interests $ (184,138) $ 156,861 $ 2,694 $ (10,745) $ (35,328) General and administrative $ 99,665 $ 24,683 $ 20,038 $ (26,141) $ 118,245 Equity-based compensation 25,348 1,363 1,130 (1,471) 26,370 Nine months ended September 30, 2018: Revenues from non-affiliates $ 1,585,204 $ 90,644 $ 46,344 $ — $ 1,722,192 Inter-segment revenues — 119,095 114,898 (233,993) — Total revenues 1,585,204 209,739 161,242 (233,993) 1,722,192 Operating income (loss) (53,159) 101,457 25,415 (24,357) 49,356 Other expense, net (370,311) (703) (99) — (371,113) Income (loss) before income taxes including non-controlling interests $ (423,470) $ 100,754 $ 25,316 $ (24,357) $ (321,757) General and administrative $ 77,425 $ 18,107 $ 17,084 $ (21,587) $ 91,029 Equity-based compensation 20,565 1,222 1,149 (1,350) 21,586 At September 30, 2019: Property, plant and equipment, net $ 6,236,331 $ 1,052,558 $ 27,712 $ (226,991) $ 7,089,610 Total assets (1) 6,736,948 1,088,728 33,292 (191,991) 7,666,977 At December 31, 2018: Property, plant and equipment, net $ 6,311,566 $ 893,285 $ 38,871 $ (216,613) $ 7,027,109 Total assets (1) 6,838,987 920,619 48,150 (181,614) 7,626,142 ___________________

Leases

Leases	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Leases	Leases As discussed in Note 2 — Summary of Significant Accounting Policies, the Company adopted ASC 842 as of January 1, 2019 using the modified retrospective method, which resulted in the Company recognizing operating lease ROU assets and lease liabilities of $31.1 million and $37.1 million, respectively. In addition, the Company recognized offsetting finance lease ROU assets and lease liabilities of $6.0 million. There was no impact to the opening equity balance as a result of adoption as the difference between the asset and liability balance is attributable to reclassifications of pre-existing balances, such as deferred rent, into the lease asset balance. Prior period amounts are not adjusted and continue to be reported in accordance with the previous guidance, Accounting Standards Codification 840 (“ASC 840”). In accordance with the adoption of ASC 842, management determines whether an arrangement is a lease at its inception. The Company’s operating and finance leases consist primarily of office space, drilling rigs, vehicles and other property and equipment used in its operations. The operating lease ROU asset also includes any lease incentives received in the recognition of the present value of future lease payments. The Company considers renewal and termination options in determining the lease term used to establish its ROU assets and lease liabilities to the extent the Company is reasonably certain to exercise the renewal or termination. The Company’s lease agreements do not contain any material residual value guarantees or material restrictive covenants. As most of the Company’s leases do not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at commencement date in determining the present value of future lease payments. The Company has determined their respective incremental borrowing rates based upon the rate of interest that would have been paid on a collateralized basis over similar tenors to that of the leases. The following table sets forth the Company’s components of lease costs for the periods presented: Three Months Ended September 30, 2019 Nine Months Ended September 30, 2019 (In thousands) Operating lease costs $ 4,986 $ 23,461 Variable lease costs (1) 1,730 6,733 Short-term lease costs 1,048 2,418 Finance lease costs: Amortization of ROU assets 694 1,910 Interest on lease liabilities 72 196 Total lease costs $ 8,530 $ 34,718 ___________________ (1) Based on payments made by the Company to lessors for the right to use an underlying asset that vary because of changes in circumstances occurring after the commencement date, other than the passage of time, such as property taxes, operating and maintenance costs. The amounts disclosed herein include costs associated with properties operated by the Company that are presented on a gross basis and do not reflect the Company’s net proportionate share of such amounts. A portion of these costs have been or will be billed to other working interest owners. The Company’s share of operating, variable and short-term lease costs are either capitalized and included in property, plant and equipment on the Company’s Condensed Consolidated Balance Sheets or are recognized in the Company’s Condensed Consolidated Statements of Operations in lease operating expenses, midstream expenses and general and administrative expenses, as applicable. The finance lease costs for the amortization of ROU assets and the interest on lease liabilities disclosed above are included in depreciation, depletion and amortization and interest expense, net of capitalized interest, respectively, on the Company’s Condensed Consolidated Statements of Operations. As of September 30, 2019, maturities of the Company’s lease liabilities are as follows: Operating Leases Finance Leases (In thousands) 2019 (excluding the nine months ended September 30, 2019) $ 3,232 $ 729 2020 7,080 2,909 2021 2,704 2,136 2022 3,073 1,367 2023 2,365 274 Thereafter 12,802 684 Total future lease payments $ 31,256 $ 8,099 Less: Imputed interest 4,111 652 Present value of future lease payments $ 27,145 $ 7,447 As of December 31, 2018, future minimum annual rental commitments under non-cancelable leases under ASC 840 were as follows: (In thousands) 2019 $ 8,723 2020 7,009 2021 6,005 2022 5,130 2023 4,361 Thereafter 13,134 Total future minimum lease payments $ 44,362 Supplemental balance sheet information related to the Company’s leases are as follows: Balance Sheet Location September 30, 2019 (In thousands) Assets Operating lease assets Operating right-of-use assets $ 21,255 Finance lease assets (1) Other assets 7,406 Total lease assets $ 28,661 Liabilities Current Operating lease liabilities Current operating lease liabilities $ 8,050 Finance lease liabilities Other current liabilities 2,698 Long-term Operating lease liabilities Operating lease liabilities 19,095 Finance lease liabilities Other liabilities 4,748 Total lease liabilities $ 34,591 ___________________ (1) Finance lease ROU assets are recorded net of accumulated amortization of $1.9 million as of September 30, 2019. Supplemental cash flow information and non-cash transactions related to the Company’s leases are as follows: September 30, 2019 (In thousands) Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 24,985 Operating cash flows from finance leases 196 Financing cash flows from finance leases 1,423 ROU assets obtained in exchange for lease obligations Operating leases $ 12,746 Finance leases 3,427 Weighted-average remaining lease terms and discount rates for the Company’s leases are as follows: As of September 30, 2019 Operating Leases Weighted average remaining lease term 6.7 years Weighted average discount rate 3.6 % Finance Leases Weighted average remaining lease term 4.1 years Weighted average discount rate 3.8 %
Leases	Leases As discussed in Note 2 — Summary of Significant Accounting Policies, the Company adopted ASC 842 as of January 1, 2019 using the modified retrospective method, which resulted in the Company recognizing operating lease ROU assets and lease liabilities of $31.1 million and $37.1 million, respectively. In addition, the Company recognized offsetting finance lease ROU assets and lease liabilities of $6.0 million. There was no impact to the opening equity balance as a result of adoption as the difference between the asset and liability balance is attributable to reclassifications of pre-existing balances, such as deferred rent, into the lease asset balance. Prior period amounts are not adjusted and continue to be reported in accordance with the previous guidance, Accounting Standards Codification 840 (“ASC 840”). In accordance with the adoption of ASC 842, management determines whether an arrangement is a lease at its inception. The Company’s operating and finance leases consist primarily of office space, drilling rigs, vehicles and other property and equipment used in its operations. The operating lease ROU asset also includes any lease incentives received in the recognition of the present value of future lease payments. The Company considers renewal and termination options in determining the lease term used to establish its ROU assets and lease liabilities to the extent the Company is reasonably certain to exercise the renewal or termination. The Company’s lease agreements do not contain any material residual value guarantees or material restrictive covenants. As most of the Company’s leases do not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at commencement date in determining the present value of future lease payments. The Company has determined their respective incremental borrowing rates based upon the rate of interest that would have been paid on a collateralized basis over similar tenors to that of the leases. The following table sets forth the Company’s components of lease costs for the periods presented: Three Months Ended September 30, 2019 Nine Months Ended September 30, 2019 (In thousands) Operating lease costs $ 4,986 $ 23,461 Variable lease costs (1) 1,730 6,733 Short-term lease costs 1,048 2,418 Finance lease costs: Amortization of ROU assets 694 1,910 Interest on lease liabilities 72 196 Total lease costs $ 8,530 $ 34,718 ___________________ (1) Based on payments made by the Company to lessors for the right to use an underlying asset that vary because of changes in circumstances occurring after the commencement date, other than the passage of time, such as property taxes, operating and maintenance costs. The amounts disclosed herein include costs associated with properties operated by the Company that are presented on a gross basis and do not reflect the Company’s net proportionate share of such amounts. A portion of these costs have been or will be billed to other working interest owners. The Company’s share of operating, variable and short-term lease costs are either capitalized and included in property, plant and equipment on the Company’s Condensed Consolidated Balance Sheets or are recognized in the Company’s Condensed Consolidated Statements of Operations in lease operating expenses, midstream expenses and general and administrative expenses, as applicable. The finance lease costs for the amortization of ROU assets and the interest on lease liabilities disclosed above are included in depreciation, depletion and amortization and interest expense, net of capitalized interest, respectively, on the Company’s Condensed Consolidated Statements of Operations. As of September 30, 2019, maturities of the Company’s lease liabilities are as follows: Operating Leases Finance Leases (In thousands) 2019 (excluding the nine months ended September 30, 2019) $ 3,232 $ 729 2020 7,080 2,909 2021 2,704 2,136 2022 3,073 1,367 2023 2,365 274 Thereafter 12,802 684 Total future lease payments $ 31,256 $ 8,099 Less: Imputed interest 4,111 652 Present value of future lease payments $ 27,145 $ 7,447 As of December 31, 2018, future minimum annual rental commitments under non-cancelable leases under ASC 840 were as follows: (In thousands) 2019 $ 8,723 2020 7,009 2021 6,005 2022 5,130 2023 4,361 Thereafter 13,134 Total future minimum lease payments $ 44,362 Supplemental balance sheet information related to the Company’s leases are as follows: Balance Sheet Location September 30, 2019 (In thousands) Assets Operating lease assets Operating right-of-use assets $ 21,255 Finance lease assets (1) Other assets 7,406 Total lease assets $ 28,661 Liabilities Current Operating lease liabilities Current operating lease liabilities $ 8,050 Finance lease liabilities Other current liabilities 2,698 Long-term Operating lease liabilities Operating lease liabilities 19,095 Finance lease liabilities Other liabilities 4,748 Total lease liabilities $ 34,591 ___________________ (1) Finance lease ROU assets are recorded net of accumulated amortization of $1.9 million as of September 30, 2019. Supplemental cash flow information and non-cash transactions related to the Company’s leases are as follows: September 30, 2019 (In thousands) Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 24,985 Operating cash flows from finance leases 196 Financing cash flows from finance leases 1,423 ROU assets obtained in exchange for lease obligations Operating leases $ 12,746 Finance leases 3,427 Weighted-average remaining lease terms and discount rates for the Company’s leases are as follows: As of September 30, 2019 Operating Leases Weighted average remaining lease term 6.7 years Weighted average discount rate 3.6 % Finance Leases Weighted average remaining lease term 4.1 years Weighted average discount rate 3.8 %

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies As of September 30, 2019, there have been no material changes to the Company’s future commitments disclosed in Note 20 — Commitments and Contingencies in the Company’s 2018 Annual Report, except as noted below. The amounts disclosed represent undiscounted cash flows on a gross basis. Volume commitment agreements. As of September 30, 2019, the Company had certain agreements with an aggregate requirement to deliver or transport a minimum quantity of approximately 47.6 MMBbls of crude oil, 37.3 MMBbls of natural gas liquids, 869.5 Bcf of natural gas and 18.1 MMBbls of water, prior to any applicable volume credits, within specified timeframes, all of which are 25 years or less. As of September 30, 2019, the estimable future commitments under these agreements were approximately $612.1 million. The future commitments under certain agreements cannot be estimated as they are based on fixed differentials relative to a commodity index price under the agreements as compared to the differential relative to a commodity index price for the Williston Basin for the production month. The commitments under these arrangements are not recorded in the accompanying Condensed Consolidated Balance Sheet as of September 30, 2019. Lease commitments. The Company has various operating and finance lease commitments that consists primarily of offices, drilling rigs, vehicles and other property and equipment used in its operations. See Note 17 — Leases for additional information. Litigation. The Company is party to various legal and/or regulatory proceedings from time to time arising in the ordinary course of business. When the Company determines that a loss is probable of occurring and is reasonably estimable, the Company accrues an undiscounted liability for such contingencies based on its best estimate using information available at the time. The Company discloses contingencies where an adverse outcome may be material, or in the judgment of management, the matter should otherwise be disclosed. During the quarter ended September 30, 2019, a loss accrual was recorded in the amount of $20 million, which the Company believes is the estimable amount of loss that could potentially be incurred from its pending legal proceedings based upon currently available information. This amount was recognized in accrued liabilities in the Company’s Condensed Consolidated Balance Sheet and general and administrative expenses in the Company’s Condensed Consolidated Statements of Operations. Mirada litigation. On March 23, 2017, Mirada Energy, LLC, Mirada Wild Basin Holding Company, LLC and Mirada Energy Fund I, LLC (collectively, “Mirada”) filed a lawsuit against Oasis, OPNA and OMS, seeking monetary damages in excess of $100 million, declaratory relief, attorneys’ fees and costs ( Mirada Energy, LLC, et al. v. Oasis Petroleum North America LLC, et al .; in the 334th Judicial District Court of Harris County, Texas; Case Number 2017-19911). Mirada asserts that it is a working interest owner in certain acreage owned and operated by the Company in Wild Basin. Specifically, Mirada asserts that the Company has breached certain agreements by: (1) failing to allow Mirada to participate in the Company’s midstream operations in Wild Basin; (2) refusing to provide Mirada with information that Mirada contends is required under certain agreements and failing to provide information in a timely fashion; (3) failing to consult with Mirada and failing to obtain Mirada’s consent prior to drilling more than one well at a time in Wild Basin; and (4) overstating the estimated costs of proposed well operations in Wild Basin. Mirada seeks a declaratory judgment that the Company be removed as operator in Wild Basin at Mirada’s election and that Mirada be allowed to elect a new operator; certain agreements apply to the Company and Mirada and Wild Basin with respect to this dispute; the Company be required to provide all information within its possession regarding proposed or ongoing operations in Wild Basin; and the Company not be permitted to drill, or propose to drill, more than one well at a time in Wild Basin without obtaining Mirada’s consent. Mirada also seeks a declaratory judgment with respect to the Company’s current midstream operations in Wild Basin. Specifically, Mirada seeks a declaratory judgment that Mirada has a right to participate in the Company’s Wild Basin midstream operations, consisting of produced water disposal, crude oil gathering and natural gas gathering and processing; that, upon Mirada’s election to participate, Mirada is obligated to pay its proportionate costs of the Company’s midstream operations in Wild Basin; and that Mirada would then be entitled to receive a share of revenues from the midstream operations and would not be charged any amount for its use of these facilities for production from the “Contract Area.” On June 30, 2017, Mirada amended its original petition to add a claim that the Company has breached certain agreements by charging Mirada for midstream services provided by its affiliates and to seek a declaratory judgment that Mirada is entitled to be paid its share of total proceeds from the sale of hydrocarbons received by OPNA or any affiliate of OPNA without deductions for midstream services provided by OPNA or its affiliates. On February 2, 2018 and February 16, 2018, Mirada filed a second and third amended petition, respectively. In these filings, Mirada alleged new legal theories for being entitled to enforce the underlying contracts and added Bighorn DevCo LLC, Bobcat DevCo LLC and Beartooth DevCo LLC as defendants, asserting that these entities were created in bad faith in an effort to avoid contractual obligations owed to Mirada. On March 2, 2018, Mirada filed a fourth amended petition that described Mirada’s alleged ownership and assignment of interests in assets purportedly governed by agreements at issue in the lawsuit. On August 31, 2018, Mirada filed a fifth amended petition that added OMP as a defendant, asserting that it was created in bad faith in an effort to avoid contractual obligations owed to Mirada. The Company believes that Mirada’s claims are without merit, that the Company has complied with its obligations under the applicable agreements and that some of Mirada’s claims are grounded in agreements that do not apply to the Company. The Company filed answers denying all of Mirada’s claims and intends and continues to vigorously defend against Mirada’s claims. On July 2, 2019, Oasis, OPNA, OMS, OMP, Bighorn DevCo LLC, Bobcat DevCo LLC and Beartooth DevCo LLC (collectively “Oasis Entities”) counterclaimed against Mirada for a judgment declaring that Oasis Entities are not obligated to purchase, manage, gather, transport, compress, process, market, sell or otherwise handle Mirada’s proportionate share of oil and gas produced from OPNA-operated wells. The counterclaim also seeks attorney’s fees, costs and expenses. On November 1, 2019, Mirada filed a sixth amended petition that stated that Mirada seeks in excess of $200 million in damages and asserted that OMS is an agent of OPNA and OPNA, OMS, OMP, Bighorn DevCo LLC, Bobcat DevCo LLC and Beartooth DevCo LLC are agents of Oasis. Mirada also changed its allegation that it may elect a new operator to allege that Mirada may remove Oasis as operator. On November 1, 2019, the Oasis Entities amended their counterclaim against Mirada for a judgment declaring that a provision in one of the agreements does not incorporate by reference any provisions in a certain participation agreement and joint operating agreement. The additional counterclaim also seeks attorney’s fees, costs and expenses. On the same day, the Oasis Entities filed an amended answer asserting additional defenses against Mirada’s claims. Discovery is ongoing, and each of the parties has made a number of procedural filings and motions, and additional filings and motions can be expected over the course of the claim. Trial is scheduled for February 2020. The Company cannot predict or guarantee the ultimate outcome or resolution of such matter. If such matter were to be determined adversely to the Company’s interests, or if the Company were forced to settle such matter for a significant amount, such resolution or settlement could have a material adverse effect on the Company’s business, financial condition, results of operations or cash flows. Such an adverse determination could materially impact the Company’s ability to operate its properties in Wild Basin or develop its identified drilling locations in Wild Basin on its current development schedule. A determination that Mirada has a right to participate in the Company’s midstream operations could materially reduce the interests of the Company in their current assets and future midstream opportunities and related revenues in Wild Basin. In addition, the Company has agreed to indemnify OMP for any losses resulting from this litigation under the omnibus agreement it entered into with OMP at the time of OMP’s initial public offering. Solomon litigation. On or about August 28, 2019, Oasis Petroleum LLC, a wholly-owned subsidiary of the Company (“OP LLC”), was named as a defendant in the lawsuit styled Andrew Solomon, on behalf of himself and those similarly situated vs. Oasis Petroleum, LLC , pending in the United States District Court for the Western District of North Dakota. The lawsuit alleged violations of the federal Fair Labor Standards Act (the “FLSA”) and Title 29 of the North Dakota Century Code (“Title 29”) as the result of OP LLC’s alleged practice of paying the plaintiff and similarly situated current and former employees overtime at rates less than required by applicable law, or failing to pay for certain overtime hours worked. The lawsuit requested that: (i) its federal claims be advanced as a collective action, with a class of all Operators, Technicians, and all other employees in substantially similar positions employed by OP LLC who were paid hourly for at least one week during the three year period prior to the commencement of the lawsuit, who worked 40 or more hours in at least one workweek and/or eight or more hours on at least one workday; and (ii) its state claims be advanced as a class action, with a class of all Operators, Technicians, and all other employees in substantially similar positions employed by OP LLC in North Dakota during the two year period prior to the commencement of the lawsuit, who worked 40 or more hours in at least one workweek and/or worked eight or more hours in a day on at least one workday. No motion has been filed for class certification, and the Company cannot predict whether such a motion will be filed or a class certified. The Company believes that Mr. Solomon’s claims are without merit and that OP LLC has complied with its obligations under the FLSA and Title 29. OP LLC has filed an answer denying all of Mr. Solomon’s claims and intends to vigorously defend against the claims. The Company cannot predict or guarantee the ultimate outcome or resolutions of such matter. If such matter were to be determined adversely to the Company’s interests, or if the Company were forced to settle such matter for a significant amount, such resolution or settlement could have a material adverse effect on the Company’s business, financial condition, results of operations or cash flows.

Condensed Consolidating Financi

Condensed Consolidating Financial Information	9 Months Ended
	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Condensed Consolidating Financial Information	Condensed Consolidating Financial Information The Notes (see Note 11 — Long-Term Debt) are guaranteed on a senior unsecured basis by the Guarantors, which are 100% owned by the Company. These guarantees are full and unconditional and joint and several among the Guarantors. Certain of the Company’s operating units, including OMP, which is accounted for on a consolidated basis, do not guarantee the Notes (“Non-Guarantor Subsidiaries”). The following financial information reflects consolidating financial information of the parent company, Oasis Petroleum Inc. (“Issuer”), its Guarantors on a combined basis (the “Combined Guarantor Subsidiaries”) and the Non-Guarantor Subsidiaries on a combined basis, prepared on the equity basis of accounting. The information is presented in accordance with the requirements of Rule 3-10 under the SEC’s Regulation S-X. The financial information may not necessarily be indicative of results of operations, cash flows or financial position had the Guarantors operated as independent entities. The Company has not presented separate financial and narrative information for each of the Guarantors because it believes such financial and narrative information would not provide any additional information that would be material in evaluating the sufficiency of the Guarantors. During the preparation of the condensed consolidating financial information as of and for the three and six months ended June 30, 2019, the Company identified errors primarily relating to the presentation of non-controlling interests and equity in earnings of subsidiaries in the financial information of the Combined Guarantor Subsidiaries and the related intercompany eliminations. • Condensed Consolidating Balance Sheet. As of December 31, 2018, it was determined that (1) in the Issuer’s financial information, investment in and advances to subsidiaries and Oasis share of stockholders’ equity were both overstated by $9.6 million, (2) in the Combined Guarantor Subsidiaries financial information, investment in and advances to subsidiaries and non-controlling interests were overstated by $11.1 million and $184.3 million, respectively, and Oasis share of stockholders’ equity was understated by $173.2 million and (3) in the intercompany eliminations financial information, investments in and advances to subsidiaries and non-controlling interests were understated by $20.7 million and $184.3 million, respectively, and Oasis share of stockholders’ equity was overstated by $163.6 million. • Condensed Consolidated Statements of Operations . For the three months ended September 30, 2018, it was determined that equity in earnings of subsidiaries and net income attributable to non-controlling interests were overstated by $5.7 million and $3.9 million, respectively, in the Combined Guarantor Subsidiaries financial information and understated by $5.7 million and $3.9 million, respectively, in the intercompany eliminations financial information. For the nine months ended September 30, 2018, it was determined that equity in earnings of subsidiaries and net income attributable to non-controlling interests were overstated by $17.2 million and $10.9 million, respectively, in the Combined Guarantor Subsidiaries financial information and understated by $17.2 million and $10.9 million, respectively, in the intercompany eliminations financial information. • Condensed Consolidated Statement of Cash Flows. For the nine months ended September 30, 2018, it was determined that cash paid for distributions to non-controlling interests was understated by $92.7 million in the Combined Guarantor Subsidiaries financial information and overstated by $92.7 million in the intercompany eliminations financial information, with the offsetting impacts in investment in subsidiaries / capital contributions from parent. These errors in the condensed consolidated financial information, which the Company has determined are not material to this disclosure, were all eliminated in consolidation and therefore have no impact on the Company’s consolidated financial position, results of operations or cash flows. The Company has revised the condensed consolidating financial information as of December 31, 2018 and for the three and nine months ended September 30, 2018 to reflect the correction of these errors. In addition, for the three and nine months ended September 30, 2018, the Company has revised the condensed consolidating financial information to reflect the correction of errors related to the manner in which it accounted for certain crude oil purchase and sale arrangements, which had no effect on the Company’s or any of its subsidiaries’ net income (loss). All impacts of this revision are included in the Combined Guarantor Subsidiaries financial information. Please see Note 2 — Summary of Significant Accounting Policies for more information related to this revision.
Condensed Consolidated Financial Information	Condensed Consolidating Balance Sheet September 30, 2019 Parent/ Combined Combined Intercompany Consolidated (In thousands, except share data) ASSETS Current assets Cash and cash equivalents $ 145 $ 14,608 $ 4,672 $ — $ 19,425 Accounts receivable, net — 373,824 7,793 — 381,617 Accounts receivable - affiliates 549,167 72,492 77,393 (699,052) — Inventory — 35,085 1,673 — 36,758 Prepaid expenses 90 4,248 964 — 5,302 Derivative instruments — 52,180 — — 52,180 Other current assets — 195 137 — 332 Total current assets 549,402 552,632 92,632 (699,052) 495,614 Property, plant and equipment Oil and gas properties (successful efforts method) — 9,393,370 — (18,864) 9,374,506 Other property and equipment — 249,572 1,089,696 — 1,339,268 Less: accumulated depreciation, depletion, amortization and impairment — (3,535,035) (89,129) — (3,624,164) Total property, plant and equipment, net — 6,107,907 1,000,567 (18,864) 7,089,610 Assets held for sale, net — 6,700 — — 6,700 Investments in and advances to subsidiaries 4,941,278 372,784 — (5,314,062) — Derivative instruments — 9,729 — — 9,729 Deferred income taxes 243,100 — — (243,100) — Long-term inventory — 14,395 — — 14,395 Operating right-of-use assets — 15,310 5,945 — 21,255 Other assets — 26,291 3,383 — 29,674 Total assets $ 5,733,780 $ 7,105,748 $ 1,102,527 $ (6,275,078) $ 7,666,977 LIABILITIES AND STOCKHOLDERS’ EQUITY Current liabilities Accounts payable $ — $ 16,319 $ 1,684 $ — $ 18,003 Accounts payable - affiliates 45,723 626,561 26,769 (699,053) — Revenues and production taxes payable — 212,602 1,171 — 213,773 Accrued liabilities 115 277,797 47,533 — 325,445 Accrued interest payable 20,758 298 273 — 21,329 Derivative instruments — 830 — — 830 Advances from joint interest partners — 3,649 — — 3,649 Current operating lease liabilities — 5,077 2,973 — 8,050 Other current liabilities — 2,773 9 — 2,782 Total current liabilities 66,596 1,145,906 80,412 (699,053) 593,861 Long-term debt 1,961,859 406,000 431,000 — 2,798,859 Deferred income taxes — 534,315 — (243,100) 291,215 Asset retirement obligations — 53,906 1,596 — 55,502 Liabilities held for sale — 6,700 — — 6,700 Operating lease liabilities — 16,116 2,979 — 19,095 Other liabilities — 1,527 557 — 2,084 Total liabilities 2,028,455 2,164,470 516,544 (942,153) 3,767,316 Stockholders’ equity Oasis share of stockholders’ equity 3,705,325 4,941,278 272,202 (5,213,479) 3,705,326 Non-controlling interests — — 313,781 (119,446) 194,335 Total stockholders’ equity 3,705,325 4,941,278 585,983 (5,332,925) 3,899,661 Total liabilities and stockholders’ equity $ 5,733,780 $ 7,105,748 $ 1,102,527 $ (6,275,078) $ 7,666,977
Condensed Consolidated Financial Information	Condensed Consolidating Balance Sheet December 31, 2018 Parent/ Combined Combined Intercompany Consolidated (In thousands, except share data) ASSETS Current assets Cash and cash equivalents $ 179 $ 15,362 $ 6,649 $ — $ 22,190 Accounts receivable, net — 385,121 2,481 — 387,602 Accounts receivable - affiliates 643,382 76,127 80,805 (800,314) — Inventory — 33,106 22 — 33,128 Prepaid expenses 373 9,206 1,418 — 10,997 Derivative instruments — 99,930 — — 99,930 Intangible assets, net — 125 — — 125 Other current assets — 183 — — 183 Total current assets 643,934 619,160 91,375 (800,314) 554,155 Property, plant and equipment Oil and gas properties (successful efforts method) — 8,923,291 — (11,102) 8,912,189 Other property and equipment — 218,617 933,155 — 1,151,772 Less: accumulated depreciation, depletion, amortization and impairment — (2,974,122) (62,730) — (3,036,852) Total property, plant and equipment, net — 6,167,786 870,425 (11,102) 7,027,109 Investments in and advances to subsidiaries 4,900,528 356,039 — (5,256,567) — Derivative instruments — 6,945 — — 6,945 Deferred income taxes 219,670 — — (219,670) — Long-term inventory — 12,260 — — 12,260 Other assets — 23,221 2,452 — 25,673 Total assets $ 5,764,132 $ 7,185,411 $ 964,252 $ (6,287,653) $ 7,626,142 LIABILITIES AND STOCKHOLDERS’ EQUITY Current liabilities Accounts payable $ — $ 18,567 $ 1,599 $ — $ 20,166 Accounts payable - affiliates 43,113 724,187 33,014 (800,314) — Revenues and production taxes payable — 216,114 581 — 216,695 Accrued liabilities 71 273,923 57,657 — 331,651 Accrued interest payable 37,096 502 442 — 38,040 Derivative instruments — 84 — — 84 Advances from joint interest partners — 5,140 — — 5,140 Total current liabilities 80,280 1,238,517 93,293 (800,314) 611,776 Long-term debt 1,949,276 468,000 318,000 — 2,735,276 Deferred income taxes — 519,725 — (219,670) 300,055 Asset retirement obligations — 50,870 1,514 — 52,384 Derivative instruments — 20 — — 20 Other liabilities — 7,751 — — 7,751 Total liabilities 2,029,556 2,284,883 412,807 (1,019,984) 3,707,262 Stockholders’ equity Oasis share of stockholders’ equity 3,734,576 4,900,528 238,630 (5,139,158) 3,734,576 Non-controlling interests — — 312,815 (128,511) 184,304 Total stockholders’ equity 3,734,576 4,900,528 551,445 (5,267,669) 3,918,880 Total liabilities and stockholders’ equity $ 5,764,132 $ 7,185,411 $ 964,252 $ (6,287,653) $ 7,626,142
Condensed Consolidated Financial Information	Condensed Consolidating Statement of Operations Three Months Ended September 30, 2019 Parent/ Combined Combined Intercompany Consolidated (In thousands) Revenues Oil and gas revenues $ — $ 344,102 $ — $ 368 $ 344,470 Purchased oil and gas sales — 79,352 — — 79,352 Midstream revenues — 2,190 100,693 (52,860) 50,023 Well services revenues — 8,898 — — 8,898 Total revenues — 434,542 100,693 (52,492) 482,743 Operating expenses Lease operating expenses — 67,367 — (17,054) 50,313 Midstream expenses — 4 24,317 (11,354) 12,967 Well services expenses — 6,151 — — 6,151 Marketing, transportation and gathering expenses — 44,409 — (11,750) 32,659 Purchased oil and gas expenses — 78,655 — — 78,655 Production taxes — 28,461 — — 28,461 Depreciation, depletion and amortization — 206,989 8,983 (5,140) 210,832 Exploration expenses — 652 — — 652 General and administrative expenses 569 48,944 7,579 (4,232) 52,860 Total operating expenses 569 481,632 40,879 (49,530) 473,550 Loss on sale of properties — (752) — — (752) Operating income (loss) (569) (47,842) 59,814 (2,962) 8,441 Other income (expense) Equity in earnings of subsidiaries 54,755 42,317 — (97,072) — Net gain on derivative instruments — 47,922 — — 47,922 Interest expense, net of capitalized interest (33,133) (6,252) (4,512) — (43,897) Other income 1 472 — — 473 Total other income (expense), net 21,623 84,459 (4,512) (97,072) 4,498 Income before income taxes 21,054 36,617 55,302 (100,034) 12,939 Income tax benefit (expense) (766) 18,138 — — 17,372 Net income including non-controlling interests 20,288 54,755 55,302 (100,034) 30,311 Less: Net income attributable to non-controlling interests — — 23,866 (13,843) 10,023 Net income attributable to Oasis $ 20,288 $ 54,755 $ 31,436 $ (86,191) $ 20,288
Condensed Consolidated Financial Information	Condensed Consolidating Statement of Operations Three Months Ended September 30, 2018 Parent/ Combined Combined Intercompany Consolidated (In thousands) Revenues Oil and gas revenues $ — $ 454,195 $ — $ — $ 454,195 Purchased oil and gas sales — 172,985 — — 172,985 Midstream revenues — 765 71,467 (41,045) 31,187 Well services revenues — 16,262 — — 16,262 Total revenues — 644,207 71,467 (41,045) 674,629 Operating expenses Lease operating expenses — 63,099 — (14,565) 48,534 Midstream expenses — 528 19,816 (11,692) 8,652 Well services expenses — 11,405 — — 11,405 Marketing, transportation and gathering expenses — 36,839 — (6,126) 30,713 Purchased oil and gas expenses — 174,329 — (60) 174,269 Production taxes — 38,722 — — 38,722 Depreciation, depletion and amortization — 159,843 7,189 (4,048) 162,984 Exploration expenses — 22,315 — — 22,315 General and administrative expenses 7,486 24,627 5,449 (2,703) 34,859 Total operating expenses 7,486 531,707 32,454 (39,194) 532,453 Gain on sale of properties — 36,869 — — 36,869 Operating income (loss) (7,486) 149,369 39,013 (1,851) 179,045 Other income (expense) Equity in earnings of subsidiaries 96,555 33,102 — (129,657) — Net loss on derivative instruments — (48,544) — — (48,544) Interest expense, net of capitalized interest (32,836) (6,561) (163) — (39,560) Loss on extinguishment of debt (47) — — — (47) Other income (expense) — 126 (15) — 111 Total other income (expense), net 63,672 (21,877) (178) (129,657) (88,040) Income before income taxes 56,186 127,492 38,835 (131,508) 91,005 Income tax benefit (expense) 6,155 (30,937) — — (24,782) Net income including non-controlling interests 62,341 96,555 38,835 (131,508) 66,223 Less: Net income attributable to non-controlling interests — — 26,459 (22,577) 3,882 Net income attributable to Oasis $ 62,341 $ 96,555 $ 12,376 $ (108,931) $ 62,341
Condensed Consolidated Financial Information	Condensed Consolidating Statement of Operations Nine Months Ended September 30, 2019 Parent/ Combined Combined Intercompany Consolidated (In thousands) Revenues Oil and gas revenues $ — $ 1,069,888 $ — $ 368 $ 1,070,256 Purchased oil and gas sales — 337,212 — — 337,212 Midstream revenues — 6,342 289,988 (146,713) 149,617 Well services revenues — 30,795 — — 30,795 Total revenues — 1,444,237 289,988 (146,345) 1,587,880 Operating expenses Lease operating expenses — 208,514 — (43,529) 164,985 Midstream expenses — 2,527 79,257 (34,720) 47,064 Well services expenses — 21,595 — — 21,595 Marketing, transportation and gathering expenses — 128,220 — (32,123) 96,097 Purchased oil and gas expenses — 338,221 — — 338,221 Production taxes — 86,221 — — 86,221 Depreciation, depletion and amortization — 566,812 26,474 (15,263) 578,023 Exploration expenses — 2,369 — — 2,369 Impairment — 653 — — 653 General and administrative expenses 15,964 91,121 24,108 (12,948) 118,245 Total operating expenses 15,964 1,446,253 129,839 (138,583) 1,453,473 Loss on sale of properties — (3,950) — — (3,950) Operating income (loss) (15,964) (5,966) 160,149 (7,762) 130,457 Other income (expense) Equity in earnings of subsidiaries 39,118 114,570 — (153,688) — Net loss on derivative instruments — (34,940) — — (34,940) Interest expense, net of capitalized interest (98,424) (20,658) (12,469) — (131,551) Other income (expense) 2 708 (4) — 706 Total other income (expense), net (59,304) 59,680 (12,473) (153,688) (165,785) Income (loss) before income taxes (75,268) 53,714 147,676 (161,450) (35,328) Income tax benefit (expense) 23,431 (14,596) — — 8,835 Net income (loss) including non-controlling interests (51,837) 39,118 147,676 (161,450) (26,493) Less: Net income attributable to non-controlling interests — — 68,499 (43,155) 25,344 Net income (loss) attributable to Oasis $ (51,837) $ 39,118 $ 79,177 $ (118,295) $ (51,837)
Condensed Consolidated Financial Information	Condensed Consolidating Statement of Operations Nine Months Ended September 30, 2018 Parent/ Combined Combined Intercompany Consolidated (In thousands) Revenues Oil and gas revenues $ — $ 1,218,639 $ — $ — $ 1,218,639 Purchased oil and gas sales — 368,758 — — 368,758 Midstream revenues — 2,832 199,446 (113,827) 88,451 Well services revenues — 46,344 — — 46,344 Total revenues — 1,636,573 199,446 (113,827) 1,722,192 Operating expenses Lease operating expenses — 176,413 — (38,957) 137,456 Midstream expenses — 2,054 53,266 (30,995) 24,325 Well services expenses — 32,352 — — 32,352 Marketing, transportation and gathering expenses — 92,164 — (17,605) 74,559 Purchased oil and gas expenses — 374,502 — (60) 374,442 Production taxes — 103,748 — — 103,748 Depreciation, depletion and amortization — 456,624 20,212 (11,017) 465,819 Exploration expenses — 23,701 — — 23,701 Impairment — 384,228 — — 384,228 General and administrative expenses 22,214 60,259 17,496 (8,940) 91,029 Total operating expenses 22,214 1,706,045 90,974 (107,574) 1,711,659 Gain on sale of properties — 38,823 — — 38,823 Operating income (loss) (22,214) (30,649) 108,472 (6,253) 49,356 Other income (expense) Equity in earnings (loss) of subsidiaries (149,295) 90,689 — 58,606 — Net loss on derivative instruments — (239,945) — — (239,945) Interest expense, net of capitalized interest (98,417) (18,591) (608) — (117,616) Loss on extinguishment of debt (13,698) — — — (13,698) Other income (expense) — 161 (15) — 146 Total other expense, net (261,410) (167,686) (623) 58,606 (371,113) Income (loss) before income taxes (283,624) (198,335) 107,849 52,353 (321,757) Income tax benefit 26,351 49,040 — — 75,391 Net income (loss) including non-controlling interests (257,273) (149,295) 107,849 52,353 (246,366) Less: Net income attributable to non-controlling interests — — 73,075 (62,168) 10,907 Net income (loss) attributable to Oasis $ (257,273) $ (149,295) $ 34,774 $ 114,521 $ (257,273)
Condensed Consolidated Financial Information	Condensed Consolidating Statement of Cash Flows Nine Months Ended September 30, 2019 Parent/ Combined Combined Intercompany Consolidated (In thousands) Cash flows from operating activities: Net income (loss) including non-controlling interests $ (51,837) $ 39,118 $ 147,676 $ (161,450) $ (26,493) Adjustments to reconcile net income (loss) including non-controlling interests to net cash provided by (used in) operating activities: Equity in earnings of subsidiaries (39,118) (114,570) — 153,688 — Depreciation, depletion and amortization — 566,812 26,474 (15,263) 578,023 Loss on sale of properties — 3,950 — — 3,950 Impairment — 653 — — 653 Deferred income taxes (23,431) 14,591 — — (8,840) Derivative instruments — 34,940 — — 34,940 Equity-based compensation expenses 13,933 12,134 303 — 26,370 Deferred financing costs amortization and other 12,582 4,948 660 — 18,190 Working capital and other changes: Change in accounts receivable, net 94,214 9,858 (1,255) (101,262) 1,555 Change in inventory — (3,676) — — (3,676) Change in prepaid expenses 283 3,416 454 — 4,153 Change in accounts payable, interest payable and accrued liabilities (13,684) (63,125) (2,173) 101,262 22,280 Change in other assets and liabilities, net — (9,258) (1,953) — (11,211) Net cash provided by (used in) operating activities (7,058) 499,791 170,186 (23,025) 639,894 Cash flows from investing activities: Capital expenditures — (543,420) (170,850) — (714,270) Acquisitions — (8,337) — — (8,337) Proceeds from sale of properties — 41,039 — — 41,039 Derivative settlements — 10,752 — — 10,752 Net cash used in investing activities — (499,966) (170,850) — (670,816) Cash flows from financing activities: Proceeds from Revolving Credit Facilities — 1,533,000 118,000 — 1,651,000 Principal payments on Revolving Credit Facilities — (1,595,000) (5,000) — (1,600,000) Deferred financing costs — (41) (811) — (852) Purchases of treasury stock (4,625) — — — (4,625) Distributions to non-controlling interests — — (69,667) 54,116 (15,551) Investment in subsidiaries / capital contributions from parent 11,649 62,824 (43,382) (31,091) — Payments on finance lease liabilities — (1,364) (59) — (1,423) Other — 2 (394) — (392) Net cash provided by (used in) financing activities 7,024 (579) (1,313) 23,025 28,157 Decrease in cash and cash equivalents (34) (754) (1,977) — (2,765) Cash and cash equivalents at beginning of period 179 15,362 6,649 — 22,190 Cash and cash equivalents at end of period $ 145 $ 14,608 $ 4,672 $ — $ 19,425
Condensed Consolidated Financial Information	Condensed Consolidating Statement of Cash Flows Nine Months Ended September 30, 2018 Parent/ Combined Combined Intercompany Consolidated (In thousands) Cash flows from operating activities: Net income (loss) including non-controlling interests $ (257,273) $ (149,295) $ 107,849 $ 52,353 $ (246,366) Adjustments to reconcile net income (loss) including non-controlling interests to net cash provided by (used in) operating activities: Equity in earnings (loss) of subsidiaries 149,295 (90,689) — (58,606) — Depreciation, depletion and amortization — 456,624 20,212 (11,017) 465,819 Loss on extinguishment of debt 13,698 — — — 13,698 Gain on sale of properties — (38,823) — — (38,823) Impairment — 384,228 — — 384,228 Deferred income taxes (26,351) (49,067) — — (75,418) Derivative instruments — 239,945 — — 239,945 Equity-based compensation expenses 20,292 1,014 280 — 21,586 Deferred financing costs amortization and other 11,955 7,884 235 — 20,074 Working capital and other changes: Change in accounts receivable, net (227,589) (77,231) 8,747 234,798 (61,275) Change in inventory — (12,076) — — (12,076) Change in prepaid expenses (350) 864 682 — 1,196 Change in accounts payable, interest payable and accrued liabilities (12,270) 278,481 18,895 (234,798) 50,308 Change in other assets and liabilities, net — (895) — — (895) Net cash provided by (used in) operating activities (328,593) 950,964 156,900 (17,270) 762,001 Cash flows from investing activities: Capital expenditures — (621,269) (219,819) — (841,088) Acquisitions — (579,886) — — (579,886) Proceeds from sale of properties — 333,029 — — 333,029 Costs related to sale of properties — (2,707) — — (2,707) Derivative settlements — (162,013) — — (162,013) Other — (1,038) — — (1,038) Net cash used in investing activities — (1,033,884) (219,819) — (1,253,703) Cash flows from financing activities: Proceeds from Revolving Credit Facilities — 2,376,000 123,000 — 2,499,000 Principal payments on Revolving Credit Facilities — (1,924,000) (35,000) — (1,959,000) Repurchase of senior unsecured notes (423,190) — — — (423,190) Proceeds from issuance of senior unsecured convertible notes 400,000 — — — 400,000 Deferred financing costs (7,058) (261) (331) — (7,650) Purchases of treasury stock (6,806) — — — (6,806) Distributions to non-controlling interests — — (103,065) 92,672 (10,393) Investment in subsidiaries / capital contributions from parent 365,601 (372,621) 82,422 (75,402) — Other 38 (125) — — (87) Net cash provided by financing activities 328,585 78,993 67,026 17,270 491,874 Increase (decrease) in cash and cash equivalents (8) (3,927) 4,107 — 172 Cash and cash equivalents at beginning of period 178 15,659 883 — 16,720 Cash and cash equivalents at end of period $ 170 $ 11,732 $ 4,990 $ — $ 16,892

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent EventsThe Company has evaluated the period after the balance sheet date, noting no subsequent events or transactions that required recognition or disclosure in the financial statements, other than as previously disclosed.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying condensed consolidated financial statements of the Company have not been audited by the Company’s independent registered public accounting firm, except that the Condensed Consolidated Balance Sheet at December 31, 2018 is derived from audited financial statements. Certain reclassifications of prior year balances have been made to conform such amounts to current year classifications. These reclassifications have no impact on net income. In the opinion of management, all adjustments, consisting of normal recurring adjustments necessary for the fair statement of the Company’s financial position, have been included. Management has made certain estimates and assumptions that affect reported amounts in the condensed consolidated financial statements and disclosures of contingencies. Actual results may differ from those estimates. The results for interim periods are not necessarily indicative of annual results. These interim financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Certain disclosures have been condensed or omitted from these financial statements. Accordingly, they do not include all of the information and notes required by accounting principles generally accepted in the United States of America (“GAAP”) for complete consolidated financial statements and should be read in conjunction with the Company’s audited consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018 (“2018 Annual Report”).
Consolidation	Consolidation. The accompanying condensed consolidated financial statements of the Company include the accounts of Oasis, the accounts of wholly-owned subsidiaries and the accounts of OMP and its general partner, OMP GP LLC (“OMP GP”). The Company has determined that the partners with equity at risk in OMP lack the authority, through voting rights or similar rights, to direct the activities that most significantly impact OMP’s economic performance. Therefore, as the limited partners of OMP do not have substantive kick-out or substantive participating rights over OMP GP, OMP is a variable interest entity. Through the Company’s ownership interest in OMP GP, the Company has the authority to direct the activities that most significantly affect economic performance and the right to receive benefits that could be potentially significant to OMP. Therefore, the Company is considered the primary beneficiary and consolidates OMP and records a non-controlling interest for the interest owned by the public. All intercompany balances and transactions have been eliminated upon consolidation.
Revision of prior Period Financial Statements	Revision of Prior Period Financial Statements. In connection with the preparation of the Company’s 2018 Annual Report, the Company identified errors in its previously issued 2017 annual consolidated financial statements and in each of the interim periods within 2018 and 2017. These prior period errors related to the manner in which it accounted for certain crude oil purchase and sale arrangements. Specifically, although the Company previously reported the transactions on a net basis, the Company was required to account for these purchase and sale arrangements on a gross basis, in accordance with Accounting Standards Codification 606, Revenue from Contracts with Customers (“ASC 606”) in 2018 , as these transactions were not subject to Accounting Standards Codification 845, Nonmonetary Transactions (“ASC 845”). The correction of these errors had no effect on the reported consolidated net income (loss) attributable to Oasis or earnings (loss) attributable to Oasis per share data. In accordance with Staff Accounting Bulletin (“SAB”) No. 99, Materiality , and SAB No. 108, Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements , the Company evaluated the errors and, based on an analysis of quantitative and qualitative factors, determined that the related impact was not material to the Company’s consolidated financial statements for any prior period. Therefore, amendments of previously filed reports are not required. In accordance with Accounting Standards Codification 250, Accounting Changes and Error Corrections , the Company has corrected the errors for the three and nine months ended September 30, 2018 by revising the unaudited condensed consolidated financial statements appearing herein.
Dividends	Dividends The Company has not paid any cash dividends since its inception. Covenants contained in its revolving credit facilities and the indentures governing the Company’s senior notes restrict the payment of cash dividends on its common stock. The Company currently intends to retain all earnings for the development of its business and for repayment of outstanding debt, and the Company does not anticipate declaring or paying any cash dividends to holders of its common stock.
Risks and Uncertainties	Risks and Uncertainties As a crude oil and natural gas producer, the Company’s revenue, profitability and future growth are substantially dependent upon the prevailing and future prices for crude oil and natural gas, which are dependent upon numerous factors beyond its control such as economic, political and regulatory developments and competition from other energy sources. The energy markets have historically been very volatile, and there can be no assurance that crude oil and natural gas prices will not be subject to wide fluctuations in the future. A substantial or extended decline in prices for crude oil and, to a lesser extent, natural gas could have a material adverse effect on the Company’s financial position, results of operations, cash flows and quantities of crude oil and natural gas reserves that may be economically produced.
Leases	Leases. In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2016-02, Leases (Topic 842) , which requires lessees to recognize a right-of-use (“ROU”) asset and related liability on the balance sheet for leases with durations greater than twelve months and also requires certain quantitative and qualitative disclosures about leasing arrangements. Accounting Standards Codification 842, Leases (“ASC 842”), was subsequently amended by various Accounting Standards Updates, which provided additional implementation guidance. The Company adopted the new standard as of January 1, 2019 using the required modified retrospective approach and elected the option to recognize a cumulative effect adjustment of initially applying the guidance to the opening balance of retained earnings in the period of adoption. Prior period amounts were not adjusted. The Company elected the package of practical expedients under the transition guidance within the new standard, including the practical expedient to not reassess under the new standard any prior conclusions about lease identification, lease classification and initial direct costs; the use-of hindsight practical expedient; the practical expedient to not reassess the prior accounting treatment for existing or expired land easements; and the practical expedient pertaining to combining lease and non-lease components for all asset classes. In addition, the Company elected not to apply the recognition requirements of ASC 842 to leases with terms of one year or less, and as such, recognition of lease payments for short-term leases are recognized in net income on a straight line basis. See Note 17 — Leases for the adoption impact and disclosures required by ASC 842.
Contingencies	Contingencies. Certain conditions may exist as of the date the Company’s consolidated financial statements are issued that may result in a loss to the Company, but which will only be resolved when one or more future events occur or fail to occur. The Company’s management, with input from legal counsel, assesses such contingent liabilities, and such assessment inherently involves judgment. In assessing loss contingencies related to legal proceedings that are pending against the Company or unasserted claims that may result in proceedings, the Company’s management, with input from legal counsel, evaluates the perceived merits of any legal proceedings or unasserted claims as well as the perceived merits of the amount of relief sought or expected to be sought therein. If the assessment of a contingency indicates that it is probable that a loss has been incurred and the amount of liability can be estimated, then the estimated undiscounted liability is accrued in the Company’s consolidated financial statements. If the assessment indicates that a potentially material loss contingency is not probable but is reasonably possible, or is probable but cannot be estimated, then the nature of the contingent liability, together with an estimate of the range of possible loss if determinable and material, is disclosed. Actual results could vary from these estimates and judgments. Loss contingencies considered remote are generally not disclosed unless they involve guarantees, in which case the guarantees would be disclosed. See Note 18 — Commitments and Contingencies for additional information regarding the Company’s contingencies.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Financial Instruments. In August 2018, the FASB issued Accounting Standards Update No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement (“ASU 2018-13”), which improves the effectiveness of the disclosure requirements for fair value measurements. The changes affect all companies that are required to include fair value measurement disclosures. ASU 2018-13 is effective for fiscal years beginning after December 15, 2019, including interim periods within those years. An entity is permitted to early adopt the removed or modified disclosures upon the issuance of ASU 2018-13 and may delay adoption of the additional disclosures until their effective date. The Company does not expect the adoption of this guidance to have an impact on its financial position, cash flows or results of operations, but it may result in changes to disclosures.
Inventory	Inventory, including long-term inventory, is stated at the lower of cost and net realizable value with cost determined on an average cost method. The Company assesses the carrying value of inventory and uses estimates and judgment when making any adjustments necessary to reduce the carrying value to net realizable value. Among the uncertainties that impact the Company’s estimates are the applicable quality and location differentials to include in the Company’s net realizable value analysis. Additionally, the Company estimates the upcoming liquidation timing of the inventory. Changes in assumptions made as to the timing of a sale can materially impact net realizable value.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Impacts of Revisions to the Company’s Condensed Consolidated Statement of Operations	For the three and nine months ended September 30, 2018, the revision did not impact the Company’s financial position or cash flows from operations, and the impacts to the Company’s Condensed Consolidated Statement of Operations were as follows: Three Months Ended September 30, 2018 Nine Months Ended September 30, 2018 As Reported Revision As Revised As Reported Revision As Revised (In thousands, except per share data) Oil and gas revenues $ 452,643 $ 1,552 $ 454,195 $ 1,212,235 $ 6,404 $ 1,218,639 Purchased oil and gas sales 46,356 126,629 172,985 121,971 246,787 368,758 Total revenues 546,448 128,181 674,629 1,469,001 253,191 1,722,192 Purchased oil and gas expenses 46,088 128,181 174,269 121,251 253,191 374,442 Total operating expenses 404,272 128,181 532,453 1,458,468 253,191 1,711,659 Net income (loss) attributable to Oasis 62,341 — 62,341 (257,273) — (257,273) Income (loss) attributable to Oasis per share: Basic $ 0.20 $ — $ 0.20 $ (0.84) $ — $ (0.84) Diluted $ 0.20 $ — $ 0.20 $ (0.84) $ — $ (0.84)

Revenue Recognition (Tables)

Revenue Recognition (Tables)	9 Months Ended
	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Remaining Performance Obligation Expected Satisfaction Period	The following table presents estimated revenue allocated to remaining performance obligations for contracted revenues that are unsatisfied (or partially satisfied) as of September 30, 2019: (In thousands) 2019 (excluding the nine months ended September 30, 2019) $ 3,003 2020 20,501 2021 25,082 2022 19,259 2023 12,642 Thereafter 14,642 Total $ 95,129
Exploration and Production Revenues
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	Revenues associated with contracts with customers for crude oil, natural gas and natural gas liquids (“NGL”) sales were as follows for the three and nine months ended September 30, 2019 and 2018: Exploration and Production Revenues Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 (In thousands) Crude oil revenues $ 318,564 $ 414,082 $ 964,662 $ 1,103,575 Purchased crude oil sales 77,018 169,531 330,594 364,404 Natural gas and NGL revenues 25,906 40,113 105,594 115,064 Purchased natural gas sales 2,334 1,616 6,590 2,161 Total exploration and production revenues $ 423,822 $ 625,342 $ 1,407,440 $ 1,585,204
Midstream Services
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	Revenues associated with contracts with customers for midstream services under fee-based arrangements and midstream product sales from purchase arrangements were as follows for the three and nine months ended September 30, 2019 and 2018: Midstream Revenues (1) Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 (In thousands) Midstream service revenues Crude oil and natural gas revenues $ 21,653 $ 18,188 $ 69,189 $ 54,124 Produced and flowback water revenues 10,803 9,985 29,309 27,919 Total midstream service revenues $ 32,456 $ 28,173 $ 98,498 $ 82,043 Midstream product revenues Purchased crude oil sales $ — $ 1,838 $ 28 $ 2,193 Natural gas and NGL revenues 16,424 — 46,541 — Freshwater revenues 1,143 3,014 4,578 6,408 Total midstream product revenues $ 17,567 $ 4,852 $ 51,147 $ 8,601 Total midstream revenues $ 50,023 $ 33,025 $ 149,645 $ 90,644 __________________ (1) Represents midstream revenues, excluding all intercompany revenues for work performed by the midstream services business segment for the Company’s ownership interests that are eliminated in consolidation and are therefore not included in consolidated midstream services revenues.
Well Services
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	Revenues associated with contracts with customers for well services were as follows for the three and nine months ended September 30, 2019 and 2018: Well Services Revenues (1) Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 (In thousands) Hydraulic fracturing revenues $ 8,228 $ 14,985 $ 28,631 $ 42,801 Equipment rental revenues 670 1,277 2,164 3,543 Total well services revenues $ 8,898 $ 16,262 $ 30,795 $ 46,344 __________________ (1) Represents well services revenues, excluding all intercompany revenues for work performed by the well services business segment for the Company’s ownership interests that are eliminated in consolidation and are therefore not included in consolidated well services revenues.

Inventory (Tables)

Inventory (Tables)	9 Months Ended
	Sep. 30, 2019
Inventory Disclosure [Abstract]
Components of Inventory	Total inventory consists of the following: September 30, 2019 December 31, 2018 (In thousands) Inventory Crude oil inventory $ 14,823 $ 14,933 Equipment and materials 21,935 18,195 Total inventory $ 36,758 $ 33,128 Long-term inventory Linefill in third party pipelines $ 14,395 $ 12,260 Total long-term inventory $ 14,395 $ 12,260 Total $ 51,153 $ 45,388
Components of Long-term Inventory	Total inventory consists of the following: September 30, 2019 December 31, 2018 (In thousands) Inventory Crude oil inventory $ 14,823 $ 14,933 Equipment and materials 21,935 18,195 Total inventory $ 36,758 $ 33,128 Long-term inventory Linefill in third party pipelines $ 14,395 $ 12,260 Total long-term inventory $ 14,395 $ 12,260 Total $ 51,153 $ 45,388

Accounts Receivable (Tables)

Accounts Receivable (Tables)	9 Months Ended
	Sep. 30, 2019
Receivables [Abstract]
Schedule of Accounts Receivable	The following table sets forth the Company’s accounts receivable, net: September 30, 2019 December 31, 2018 (In thousands) Trade accounts $ 262,966 $ 245,546 Joint interest accounts 107,254 133,375 Other accounts 13,014 10,207 Total 383,234 389,128 Allowance for doubtful accounts (1,617) (1,526) Total accounts receivable, net $ 381,617 $ 387,602

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Hierarchy of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following tables set forth by level, within the fair value hierarchy, the Company’s financial assets and liabilities that were accounted for at fair value on a recurring basis: Fair value at September 30, 2019 Level 1 Level 2 Level 3 Total (In thousands) Assets: Money market funds $ 145 $ — $ — $ 145 Commodity derivative instruments (see Note 8) — 61,909 — 61,909 Total assets $ 145 $ 61,909 $ — $ 62,054 Liabilities: Commodity derivative instruments (see Note 8) $ — $ 830 $ — $ 830 Total liabilities $ — $ 830 $ — $ 830 Fair value at December 31, 2018 Level 1 Level 2 Level 3 Total (In thousands) Assets: Money market funds $ 143 $ — $ — $ 143 Commodity derivative instruments (see Note 8) — 106,875 — 106,875 Total assets $ 143 $ 106,875 $ — $ 107,018 Liabilities: Commodity derivative instruments (see Note 8) $ — $ 104 $ — $ 104 Total liabilities $ — $ 104 $ — $ 104

Derivative Instruments (Tables)

Derivative Instruments (Tables)	9 Months Ended
	Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Outstanding Commodity Derivative Instruments	At September 30, 2019, the Company had the following outstanding commodity derivative instruments: Commodity Settlement Derivative Index Volumes Weighted Average Prices Fair Value Fixed Price Swaps Basis Swaps Sub-Floor Floor Ceiling (In thousands) Crude oil 2019 Fixed price swaps NYMEX WTI 2,275,000 Bbl $ 57.49 $ 5,744 Crude oil 2019 Basis swaps Houston-NYMEX WTI 90,000 Bbl $ 4.55 142 Crude oil 2019 Two-way collar NYMEX WTI 1,274,000 Bbl $ 58.07 $ 74.64 5,002 Crude oil 2019 Three-way collar NYMEX WTI 1,092,000 Bbl $ 40.00 $ 51.57 $ 65.40 768 Crude oil 2020 Fixed price swaps NYMEX WTI 3,418,000 Bbl $ 58.69 21,461 Crude oil 2020 Two-way collar NYMEX WTI 2,378,000 Bbl $ 52.11 $ 62.98 7,609 Crude oil 2020 Three-way collar NYMEX WTI 4,574,000 Bbl $ 40.00 $ 53.26 $ 64.48 15,871 Crude oil 2021 Fixed price swaps NYMEX WTI 93,000 Bbl $ 58.85 770 Crude oil 2021 Two-way collar NYMEX WTI 62,000 Bbl $ 50.50 $ 60.70 245 Crude oil 2021 Three-way collar NYMEX WTI 734,000 Bbl $ 40.00 $ 51.26 $ 64.05 2,101 Natural gas 2019 Fixed price swaps NYMEX HH 2,760,000 MMBtu $ 2.92 1,366 $ 61,079
Gains and Losses from Commodity Derivative Instruments	The following table summarizes the location and amounts of gains and losses from the Company’s commodity derivative instruments recorded in the Company’s Condensed Consolidated Statements of Operations for the periods presented: Three Months Ended September 30, Nine Months Ended September 30, Statements of Operations Location 2019 2018 2019 2018 (In thousands) Net gain (loss) on derivative instruments $ 47,922 $ (48,544) $ (34,940) $ (239,945)
Summary of Gross and Net Information about Commodity Derivative Assets	The following table summarizes the location and fair value of all outstanding commodity derivative instruments recorded in the Company’s Condensed Consolidated Balance Sheets: September 30, 2019 Commodity Balance Sheet Location Gross Recognized Assets/Liabilities Gross Amount Offset Net Recognized Fair Value Assets/ Liabilities (In thousands) Derivatives assets: Commodity contracts Derivative instruments — current assets $ 63,743 $ (11,563) $ 52,180 Commodity contracts Derivative instruments — non-current assets 16,263 (6,534) 9,729 Total derivatives assets $ 80,006 $ (18,097) $ 61,909 Derivatives liabilities: Commodity contracts Derivative instruments — current liabilities $ 1,428 $ (598) $ 830 Commodity contracts Derivative instruments — non-current liabilities — — — Total derivatives liabilities $ 1,428 $ (598) $ 830 December 31, 2018 Commodity Balance Sheet Location Gross Recognized Assets/Liabilities Gross Amount Offset Net Recognized Fair Value Assets/Liabilities (In thousands) Derivatives assets: Commodity contracts Derivative instruments — current assets $ 110,729 $ (10,799) $ 99,930 Commodity contracts Derivative instruments — non-current assets 8,251 (1,306) 6,945 Total derivatives assets $ 118,980 $ (12,105) $ 106,875 Derivatives liabilities: Commodity contracts Derivative instruments — current liabilities $ 84 $ — $ 84 Commodity contracts Derivative instruments — non-current liabilities 20 — 20 Total derivatives liabilities $ 104 $ — $ 104
Summary of Gross and Net Information about Commodity Derivative Liabilities	The following table summarizes the location and fair value of all outstanding commodity derivative instruments recorded in the Company’s Condensed Consolidated Balance Sheets: September 30, 2019 Commodity Balance Sheet Location Gross Recognized Assets/Liabilities Gross Amount Offset Net Recognized Fair Value Assets/ Liabilities (In thousands) Derivatives assets: Commodity contracts Derivative instruments — current assets $ 63,743 $ (11,563) $ 52,180 Commodity contracts Derivative instruments — non-current assets 16,263 (6,534) 9,729 Total derivatives assets $ 80,006 $ (18,097) $ 61,909 Derivatives liabilities: Commodity contracts Derivative instruments — current liabilities $ 1,428 $ (598) $ 830 Commodity contracts Derivative instruments — non-current liabilities — — — Total derivatives liabilities $ 1,428 $ (598) $ 830 December 31, 2018 Commodity Balance Sheet Location Gross Recognized Assets/Liabilities Gross Amount Offset Net Recognized Fair Value Assets/Liabilities (In thousands) Derivatives assets: Commodity contracts Derivative instruments — current assets $ 110,729 $ (10,799) $ 99,930 Commodity contracts Derivative instruments — non-current assets 8,251 (1,306) 6,945 Total derivatives assets $ 118,980 $ (12,105) $ 106,875 Derivatives liabilities: Commodity contracts Derivative instruments — current liabilities $ 84 $ — $ 84 Commodity contracts Derivative instruments — non-current liabilities 20 — 20 Total derivatives liabilities $ 104 $ — $ 104

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	9 Months Ended
	Sep. 30, 2019
Property, Plant and Equipment [Abstract]
Schedule of Property, Plant and Equipment	The following table sets forth the Company’s property, plant and equipment: September 30, 2019 December 31, 2018 (In thousands) Proved oil and gas properties (1) $ 8,550,060 $ 7,878,104 Less: Accumulated depreciation, depletion, amortization and impairment (3,400,802) (2,853,353) Proved oil and gas properties, net 5,149,258 5,024,751 Unproved oil and gas properties 824,446 1,034,085 Other property and equipment (2) 1,339,268 1,151,772 Less: Accumulated depreciation (223,362) (183,499) Other property and equipment, net 1,115,906 968,273 Total property, plant and equipment, net $ 7,089,610 $ 7,027,109 __________________ (1) Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $42.2 million and $40.5 million at September 30, 2019 and December 31, 2018, respectively. (2) Included in the Company’s other property and equipment are estimates of future asset retirement costs of $1.4 million and $1.3 million at September 30, 2019 and December 31, 2018, respectively.

Discontinued Operations and Dis

Discontinued Operations and Disposal Groups (Tables)	9 Months Ended
	Sep. 30, 2019
Discontinued Operations and Disposal Groups [Abstract]
Balance Sheet Data Related to Assets Held for Sale	The following table presents balance sheet data related to the assets and liabilities held for sale related to the 2019 Divestitures as of September 30, 2019: September 30, 2019 (In thousands) Assets: Oil and gas properties (successful efforts method) $ 6,700 Less: accumulated depreciation, depletion, amortization and impairment — Total assets held for sale, net $ 6,700 Liabilities: Accrued liabilities $ 6,700 Total liabilities held for sale $ 6,700

Long-Term Debt (Tables)

Long-Term Debt (Tables)	9 Months Ended
	Sep. 30, 2019
Debt Disclosure [Abstract]
Schedule of Long-Term Debt	The Company’s long-term debt consists of the following: September 30, 2019 December 31, 2018 (In thousands) Oasis Credit Facility $ 406,000 $ 468,000 OMP Credit Facility 431,000 318,000 Senior unsecured notes 6.50% senior unsecured notes due November 1, 2021 71,835 71,835 6.875% senior unsecured notes due March 15, 2022 901,480 901,480 6.875% senior unsecured notes due January 15, 2023 366,094 366,094 6.25% senior unsecured notes due May 1, 2026 400,000 400,000 2.625% senior unsecured convertible notes due September 15, 2023 300,000 300,000 Total principal of senior unsecured notes 2,039,409 2,039,409 Less: unamortized deferred financing costs on senior unsecured notes (17,309) (20,865) Less: unamortized debt discount on senior unsecured convertible notes (60,241) (69,268) Total long-term debt $ 2,798,859 $ 2,735,276

Asset Retirement Obligations (T

Asset Retirement Obligations (Tables)	9 Months Ended
	Sep. 30, 2019
Asset Retirement Obligation Disclosure [Abstract]
Schedule of Changes in Asset Retirement Obligations	The following table reflects the changes in the Company’s ARO during the nine months ended September 30, 2019: (In thousands) Balance at December 31, 2018 $ 52,449 Liabilities incurred during period 1,436 Liabilities settled during period (644) Accretion expense during period (1) 2,187 Revisions to estimates 647 Balance at September 30, 2019 $ 56,075 ___________________ (1) Included in depreciation, depletion and amortization on the Company’s Condensed Consolidated Statements of Operations.

Equity-Based Compensation (Tabl

Equity-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2019
Share-based Payment Arrangement [Abstract]
Summary of Stock Based Compensation Assumptions	The following assumptions were used for the Monte Carlo model to determine the grant date fair value and associated equity-based compensation expense of the PSUs granted during the nine months ended September 30, 2019: Risk-free interest rate 2.55% - 2.56% Oasis volatility 71.17 % Oasis initial value $5.85 Oasis stock price on date of grant $6.63

Earnings (Loss) Per Share (Tabl

Earnings (Loss) Per Share (Tables)	9 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
Schedule of Weighted-Average Number of Shares Outstanding	The following is a calculation of the basic and diluted weighted average shares outstanding for the three and nine months ended September 30, 2019 and 2018: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 (In thousands) Basic and diluted weighted average common shares outstanding 315,135 313,167 314,863 305,533 Dilutive effect of restricted stock awards and PSUs (1) — 3,220 — — Diluted weighted average common shares outstanding 315,135 316,387 314,863 305,533 ___________________ (1) No unvested stock awards were included in computing earnings (loss) per share for the three and nine months ended September 30, 2019 and for the nine months ended September 30, 2018 because the effects were anti-dilutive.
Schedule of Common Shares Excluded From Diluted Earnings (Loss) per Share Calculation	The following is a calculation of weighted average common shares excluded from diluted earnings (loss) per share due to the anti-dilutive effect: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 (In thousands) Restricted stock awards and PSUs 9,825 4,180 10,106 7,284

Business Segment Information (T

Business Segment Information (Tables)	9 Months Ended
	Sep. 30, 2019
Segment Reporting [Abstract]
Summarized Financial Information of Segments	The following table summarizes financial information for the Company’s three business segments for the periods presented: Exploration and Midstream Services Well Services Eliminations Consolidated (In thousands) Three months ended September 30, 2019: Revenues from non-affiliates $ 423,822 $ 50,023 $ 8,898 $ — $ 482,743 Inter-segment revenues — 73,388 21,511 (94,899) — Total revenues 423,822 123,411 30,409 (94,899) 482,743 Operating income (loss) (51,476) 64,299 236 (4,618) 8,441 Other income (expense), net 8,871 (4,512) 139 — 4,498 Income (loss) before income taxes including non-controlling interests $ (42,605) $ 59,787 $ 375 $ (4,618) $ 12,939 General and administrative $ 46,377 $ 7,842 $ 6,489 $ (7,848) $ 52,860 Equity-based compensation 8,246 383 42 (225) 8,446 Three months ended September 30, 2018: Revenues from non-affiliates $ 625,342 $ 33,025 $ 16,262 $ — $ 674,629 Inter-segment revenues — 42,745 40,177 (82,922) — Total revenues 625,342 75,770 56,439 (82,922) 674,629 Operating income 146,969 31,326 9,237 (8,487) 179,045 Other expense, net (87,594) (367) (79) — (88,040) Income before income taxes including non-controlling interests $ 59,375 $ 30,959 $ 9,158 $ (8,487) $ 91,005 General and administrative $ 30,454 $ 5,614 $ 5,437 $ (6,646) $ 34,859 Equity-based compensation 7,102 442 354 (442) 7,456 Nine months ended September 30, 2019: Revenues from non-affiliates $ 1,407,440 $ 149,645 $ 30,795 $ — $ 1,587,880 Inter-segment revenues — 199,793 71,526 (271,319) — Total revenues 1,407,440 349,438 102,321 (271,319) 1,587,880 Operating income (loss) (30,657) 169,321 2,538 (10,745) 130,457 Other income (expense), net (153,481) (12,460) 156 — (165,785) Income (loss) before income taxes including non-controlling interests $ (184,138) $ 156,861 $ 2,694 $ (10,745) $ (35,328) General and administrative $ 99,665 $ 24,683 $ 20,038 $ (26,141) $ 118,245 Equity-based compensation 25,348 1,363 1,130 (1,471) 26,370 Nine months ended September 30, 2018: Revenues from non-affiliates $ 1,585,204 $ 90,644 $ 46,344 $ — $ 1,722,192 Inter-segment revenues — 119,095 114,898 (233,993) — Total revenues 1,585,204 209,739 161,242 (233,993) 1,722,192 Operating income (loss) (53,159) 101,457 25,415 (24,357) 49,356 Other expense, net (370,311) (703) (99) — (371,113) Income (loss) before income taxes including non-controlling interests $ (423,470) $ 100,754 $ 25,316 $ (24,357) $ (321,757) General and administrative $ 77,425 $ 18,107 $ 17,084 $ (21,587) $ 91,029 Equity-based compensation 20,565 1,222 1,149 (1,350) 21,586 At September 30, 2019: Property, plant and equipment, net $ 6,236,331 $ 1,052,558 $ 27,712 $ (226,991) $ 7,089,610 Total assets (1) 6,736,948 1,088,728 33,292 (191,991) 7,666,977 At December 31, 2018: Property, plant and equipment, net $ 6,311,566 $ 893,285 $ 38,871 $ (216,613) $ 7,027,109 Total assets (1) 6,838,987 920,619 48,150 (181,614) 7,626,142 ___________________

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Components of lease expense, supplemental cash flow information and non-cash transactions related to Company's leases	The following table sets forth the Company’s components of lease costs for the periods presented: Three Months Ended September 30, 2019 Nine Months Ended September 30, 2019 (In thousands) Operating lease costs $ 4,986 $ 23,461 Variable lease costs (1) 1,730 6,733 Short-term lease costs 1,048 2,418 Finance lease costs: Amortization of ROU assets 694 1,910 Interest on lease liabilities 72 196 Total lease costs $ 8,530 $ 34,718 ___________________ (1) Based on payments made by the Company to lessors for the right to use an underlying asset that vary because of changes in circumstances occurring after the commencement date, other than the passage of time, such as property taxes, operating and maintenance costs.
Maturities of the Company's lease liabilities	As of September 30, 2019, maturities of the Company’s lease liabilities are as follows: Operating Leases Finance Leases (In thousands) 2019 (excluding the nine months ended September 30, 2019) $ 3,232 $ 729 2020 7,080 2,909 2021 2,704 2,136 2022 3,073 1,367 2023 2,365 274 Thereafter 12,802 684 Total future lease payments $ 31,256 $ 8,099 Less: Imputed interest 4,111 652 Present value of future lease payments $ 27,145 $ 7,447
Maturities of the Company's lease liabilities	As of September 30, 2019, maturities of the Company’s lease liabilities are as follows: Operating Leases Finance Leases (In thousands) 2019 (excluding the nine months ended September 30, 2019) $ 3,232 $ 729 2020 7,080 2,909 2021 2,704 2,136 2022 3,073 1,367 2023 2,365 274 Thereafter 12,802 684 Total future lease payments $ 31,256 $ 8,099 Less: Imputed interest 4,111 652 Present value of future lease payments $ 27,145 $ 7,447
Schedule of future minimum annual rental commitments	As of December 31, 2018, future minimum annual rental commitments under non-cancelable leases under ASC 840 were as follows: (In thousands) 2019 $ 8,723 2020 7,009 2021 6,005 2022 5,130 2023 4,361 Thereafter 13,134 Total future minimum lease payments $ 44,362
Supplemental balance sheet information	Supplemental balance sheet information related to the Company’s leases are as follows: Balance Sheet Location September 30, 2019 (In thousands) Assets Operating lease assets Operating right-of-use assets $ 21,255 Finance lease assets (1) Other assets 7,406 Total lease assets $ 28,661 Liabilities Current Operating lease liabilities Current operating lease liabilities $ 8,050 Finance lease liabilities Other current liabilities 2,698 Long-term Operating lease liabilities Operating lease liabilities 19,095 Finance lease liabilities Other liabilities 4,748 Total lease liabilities $ 34,591 ___________________ (1) Finance lease ROU assets are recorded net of accumulated amortization of $1.9 million as of September 30, 2019.
Schedule of supplemental cash flow information	Supplemental cash flow information and non-cash transactions related to the Company’s leases are as follows: September 30, 2019 (In thousands) Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 24,985 Operating cash flows from finance leases 196 Financing cash flows from finance leases 1,423 ROU assets obtained in exchange for lease obligations Operating leases $ 12,746 Finance leases 3,427
Weighted-average remaining lease term and discount rate for the Company’s leases	Weighted-average remaining lease terms and discount rates for the Company’s leases are as follows: As of September 30, 2019 Operating Leases Weighted average remaining lease term 6.7 years Weighted average discount rate 3.6 % Finance Leases Weighted average remaining lease term 4.1 years Weighted average discount rate 3.8 %

Condensed Consolidating Finan_2

Condensed Consolidating Financial Information (Tables)	9 Months Ended
	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Condensed Consolidating Balance Sheet	Condensed Consolidating Balance Sheet September 30, 2019 Parent/ Combined Combined Intercompany Consolidated (In thousands, except share data) ASSETS Current assets Cash and cash equivalents $ 145 $ 14,608 $ 4,672 $ — $ 19,425 Accounts receivable, net — 373,824 7,793 — 381,617 Accounts receivable - affiliates 549,167 72,492 77,393 (699,052) — Inventory — 35,085 1,673 — 36,758 Prepaid expenses 90 4,248 964 — 5,302 Derivative instruments — 52,180 — — 52,180 Other current assets — 195 137 — 332 Total current assets 549,402 552,632 92,632 (699,052) 495,614 Property, plant and equipment Oil and gas properties (successful efforts method) — 9,393,370 — (18,864) 9,374,506 Other property and equipment — 249,572 1,089,696 — 1,339,268 Less: accumulated depreciation, depletion, amortization and impairment — (3,535,035) (89,129) — (3,624,164) Total property, plant and equipment, net — 6,107,907 1,000,567 (18,864) 7,089,610 Assets held for sale, net — 6,700 — — 6,700 Investments in and advances to subsidiaries 4,941,278 372,784 — (5,314,062) — Derivative instruments — 9,729 — — 9,729 Deferred income taxes 243,100 — — (243,100) — Long-term inventory — 14,395 — — 14,395 Operating right-of-use assets — 15,310 5,945 — 21,255 Other assets — 26,291 3,383 — 29,674 Total assets $ 5,733,780 $ 7,105,748 $ 1,102,527 $ (6,275,078) $ 7,666,977 LIABILITIES AND STOCKHOLDERS’ EQUITY Current liabilities Accounts payable $ — $ 16,319 $ 1,684 $ — $ 18,003 Accounts payable - affiliates 45,723 626,561 26,769 (699,053) — Revenues and production taxes payable — 212,602 1,171 — 213,773 Accrued liabilities 115 277,797 47,533 — 325,445 Accrued interest payable 20,758 298 273 — 21,329 Derivative instruments — 830 — — 830 Advances from joint interest partners — 3,649 — — 3,649 Current operating lease liabilities — 5,077 2,973 — 8,050 Other current liabilities — 2,773 9 — 2,782 Total current liabilities 66,596 1,145,906 80,412 (699,053) 593,861 Long-term debt 1,961,859 406,000 431,000 — 2,798,859 Deferred income taxes — 534,315 — (243,100) 291,215 Asset retirement obligations — 53,906 1,596 — 55,502 Liabilities held for sale — 6,700 — — 6,700 Operating lease liabilities — 16,116 2,979 — 19,095 Other liabilities — 1,527 557 — 2,084 Total liabilities 2,028,455 2,164,470 516,544 (942,153) 3,767,316 Stockholders’ equity Oasis share of stockholders’ equity 3,705,325 4,941,278 272,202 (5,213,479) 3,705,326 Non-controlling interests — — 313,781 (119,446) 194,335 Total stockholders’ equity 3,705,325 4,941,278 585,983 (5,332,925) 3,899,661 Total liabilities and stockholders’ equity $ 5,733,780 $ 7,105,748 $ 1,102,527 $ (6,275,078) $ 7,666,977
Condensed Consolidating Balance Sheet	Condensed Consolidating Balance Sheet December 31, 2018 Parent/ Combined Combined Intercompany Consolidated (In thousands, except share data) ASSETS Current assets Cash and cash equivalents $ 179 $ 15,362 $ 6,649 $ — $ 22,190 Accounts receivable, net — 385,121 2,481 — 387,602 Accounts receivable - affiliates 643,382 76,127 80,805 (800,314) — Inventory — 33,106 22 — 33,128 Prepaid expenses 373 9,206 1,418 — 10,997 Derivative instruments — 99,930 — — 99,930 Intangible assets, net — 125 — — 125 Other current assets — 183 — — 183 Total current assets 643,934 619,160 91,375 (800,314) 554,155 Property, plant and equipment Oil and gas properties (successful efforts method) — 8,923,291 — (11,102) 8,912,189 Other property and equipment — 218,617 933,155 — 1,151,772 Less: accumulated depreciation, depletion, amortization and impairment — (2,974,122) (62,730) — (3,036,852) Total property, plant and equipment, net — 6,167,786 870,425 (11,102) 7,027,109 Investments in and advances to subsidiaries 4,900,528 356,039 — (5,256,567) — Derivative instruments — 6,945 — — 6,945 Deferred income taxes 219,670 — — (219,670) — Long-term inventory — 12,260 — — 12,260 Other assets — 23,221 2,452 — 25,673 Total assets $ 5,764,132 $ 7,185,411 $ 964,252 $ (6,287,653) $ 7,626,142 LIABILITIES AND STOCKHOLDERS’ EQUITY Current liabilities Accounts payable $ — $ 18,567 $ 1,599 $ — $ 20,166 Accounts payable - affiliates 43,113 724,187 33,014 (800,314) — Revenues and production taxes payable — 216,114 581 — 216,695 Accrued liabilities 71 273,923 57,657 — 331,651 Accrued interest payable 37,096 502 442 — 38,040 Derivative instruments — 84 — — 84 Advances from joint interest partners — 5,140 — — 5,140 Total current liabilities 80,280 1,238,517 93,293 (800,314) 611,776 Long-term debt 1,949,276 468,000 318,000 — 2,735,276 Deferred income taxes — 519,725 — (219,670) 300,055 Asset retirement obligations — 50,870 1,514 — 52,384 Derivative instruments — 20 — — 20 Other liabilities — 7,751 — — 7,751 Total liabilities 2,029,556 2,284,883 412,807 (1,019,984) 3,707,262 Stockholders’ equity Oasis share of stockholders’ equity 3,734,576 4,900,528 238,630 (5,139,158) 3,734,576 Non-controlling interests — — 312,815 (128,511) 184,304 Total stockholders’ equity 3,734,576 4,900,528 551,445 (5,267,669) 3,918,880 Total liabilities and stockholders’ equity $ 5,764,132 $ 7,185,411 $ 964,252 $ (6,287,653) $ 7,626,142
Condensed Consolidating Statement of Operations	Condensed Consolidating Statement of Operations Three Months Ended September 30, 2019 Parent/ Combined Combined Intercompany Consolidated (In thousands) Revenues Oil and gas revenues $ — $ 344,102 $ — $ 368 $ 344,470 Purchased oil and gas sales — 79,352 — — 79,352 Midstream revenues — 2,190 100,693 (52,860) 50,023 Well services revenues — 8,898 — — 8,898 Total revenues — 434,542 100,693 (52,492) 482,743 Operating expenses Lease operating expenses — 67,367 — (17,054) 50,313 Midstream expenses — 4 24,317 (11,354) 12,967 Well services expenses — 6,151 — — 6,151 Marketing, transportation and gathering expenses — 44,409 — (11,750) 32,659 Purchased oil and gas expenses — 78,655 — — 78,655 Production taxes — 28,461 — — 28,461 Depreciation, depletion and amortization — 206,989 8,983 (5,140) 210,832 Exploration expenses — 652 — — 652 General and administrative expenses 569 48,944 7,579 (4,232) 52,860 Total operating expenses 569 481,632 40,879 (49,530) 473,550 Loss on sale of properties — (752) — — (752) Operating income (loss) (569) (47,842) 59,814 (2,962) 8,441 Other income (expense) Equity in earnings of subsidiaries 54,755 42,317 — (97,072) — Net gain on derivative instruments — 47,922 — — 47,922 Interest expense, net of capitalized interest (33,133) (6,252) (4,512) — (43,897) Other income 1 472 — — 473 Total other income (expense), net 21,623 84,459 (4,512) (97,072) 4,498 Income before income taxes 21,054 36,617 55,302 (100,034) 12,939 Income tax benefit (expense) (766) 18,138 — — 17,372 Net income including non-controlling interests 20,288 54,755 55,302 (100,034) 30,311 Less: Net income attributable to non-controlling interests — — 23,866 (13,843) 10,023 Net income attributable to Oasis $ 20,288 $ 54,755 $ 31,436 $ (86,191) $ 20,288
Condensed Consolidating Statement of Operations	Condensed Consolidating Statement of Operations Three Months Ended September 30, 2018 Parent/ Combined Combined Intercompany Consolidated (In thousands) Revenues Oil and gas revenues $ — $ 454,195 $ — $ — $ 454,195 Purchased oil and gas sales — 172,985 — — 172,985 Midstream revenues — 765 71,467 (41,045) 31,187 Well services revenues — 16,262 — — 16,262 Total revenues — 644,207 71,467 (41,045) 674,629 Operating expenses Lease operating expenses — 63,099 — (14,565) 48,534 Midstream expenses — 528 19,816 (11,692) 8,652 Well services expenses — 11,405 — — 11,405 Marketing, transportation and gathering expenses — 36,839 — (6,126) 30,713 Purchased oil and gas expenses — 174,329 — (60) 174,269 Production taxes — 38,722 — — 38,722 Depreciation, depletion and amortization — 159,843 7,189 (4,048) 162,984 Exploration expenses — 22,315 — — 22,315 General and administrative expenses 7,486 24,627 5,449 (2,703) 34,859 Total operating expenses 7,486 531,707 32,454 (39,194) 532,453 Gain on sale of properties — 36,869 — — 36,869 Operating income (loss) (7,486) 149,369 39,013 (1,851) 179,045 Other income (expense) Equity in earnings of subsidiaries 96,555 33,102 — (129,657) — Net loss on derivative instruments — (48,544) — — (48,544) Interest expense, net of capitalized interest (32,836) (6,561) (163) — (39,560) Loss on extinguishment of debt (47) — — — (47) Other income (expense) — 126 (15) — 111 Total other income (expense), net 63,672 (21,877) (178) (129,657) (88,040) Income before income taxes 56,186 127,492 38,835 (131,508) 91,005 Income tax benefit (expense) 6,155 (30,937) — — (24,782) Net income including non-controlling interests 62,341 96,555 38,835 (131,508) 66,223 Less: Net income attributable to non-controlling interests — — 26,459 (22,577) 3,882 Net income attributable to Oasis $ 62,341 $ 96,555 $ 12,376 $ (108,931) $ 62,341
Condensed Consolidating Statement of Operations	Condensed Consolidating Statement of Operations Nine Months Ended September 30, 2019 Parent/ Combined Combined Intercompany Consolidated (In thousands) Revenues Oil and gas revenues $ — $ 1,069,888 $ — $ 368 $ 1,070,256 Purchased oil and gas sales — 337,212 — — 337,212 Midstream revenues — 6,342 289,988 (146,713) 149,617 Well services revenues — 30,795 — — 30,795 Total revenues — 1,444,237 289,988 (146,345) 1,587,880 Operating expenses Lease operating expenses — 208,514 — (43,529) 164,985 Midstream expenses — 2,527 79,257 (34,720) 47,064 Well services expenses — 21,595 — — 21,595 Marketing, transportation and gathering expenses — 128,220 — (32,123) 96,097 Purchased oil and gas expenses — 338,221 — — 338,221 Production taxes — 86,221 — — 86,221 Depreciation, depletion and amortization — 566,812 26,474 (15,263) 578,023 Exploration expenses — 2,369 — — 2,369 Impairment — 653 — — 653 General and administrative expenses 15,964 91,121 24,108 (12,948) 118,245 Total operating expenses 15,964 1,446,253 129,839 (138,583) 1,453,473 Loss on sale of properties — (3,950) — — (3,950) Operating income (loss) (15,964) (5,966) 160,149 (7,762) 130,457 Other income (expense) Equity in earnings of subsidiaries 39,118 114,570 — (153,688) — Net loss on derivative instruments — (34,940) — — (34,940) Interest expense, net of capitalized interest (98,424) (20,658) (12,469) — (131,551) Other income (expense) 2 708 (4) — 706 Total other income (expense), net (59,304) 59,680 (12,473) (153,688) (165,785) Income (loss) before income taxes (75,268) 53,714 147,676 (161,450) (35,328) Income tax benefit (expense) 23,431 (14,596) — — 8,835 Net income (loss) including non-controlling interests (51,837) 39,118 147,676 (161,450) (26,493) Less: Net income attributable to non-controlling interests — — 68,499 (43,155) 25,344 Net income (loss) attributable to Oasis $ (51,837) $ 39,118 $ 79,177 $ (118,295) $ (51,837)
Condensed Consolidating Statement of Operations	Condensed Consolidating Statement of Operations Nine Months Ended September 30, 2018 Parent/ Combined Combined Intercompany Consolidated (In thousands) Revenues Oil and gas revenues $ — $ 1,218,639 $ — $ — $ 1,218,639 Purchased oil and gas sales — 368,758 — — 368,758 Midstream revenues — 2,832 199,446 (113,827) 88,451 Well services revenues — 46,344 — — 46,344 Total revenues — 1,636,573 199,446 (113,827) 1,722,192 Operating expenses Lease operating expenses — 176,413 — (38,957) 137,456 Midstream expenses — 2,054 53,266 (30,995) 24,325 Well services expenses — 32,352 — — 32,352 Marketing, transportation and gathering expenses — 92,164 — (17,605) 74,559 Purchased oil and gas expenses — 374,502 — (60) 374,442 Production taxes — 103,748 — — 103,748 Depreciation, depletion and amortization — 456,624 20,212 (11,017) 465,819 Exploration expenses — 23,701 — — 23,701 Impairment — 384,228 — — 384,228 General and administrative expenses 22,214 60,259 17,496 (8,940) 91,029 Total operating expenses 22,214 1,706,045 90,974 (107,574) 1,711,659 Gain on sale of properties — 38,823 — — 38,823 Operating income (loss) (22,214) (30,649) 108,472 (6,253) 49,356 Other income (expense) Equity in earnings (loss) of subsidiaries (149,295) 90,689 — 58,606 — Net loss on derivative instruments — (239,945) — — (239,945) Interest expense, net of capitalized interest (98,417) (18,591) (608) — (117,616) Loss on extinguishment of debt (13,698) — — — (13,698) Other income (expense) — 161 (15) — 146 Total other expense, net (261,410) (167,686) (623) 58,606 (371,113) Income (loss) before income taxes (283,624) (198,335) 107,849 52,353 (321,757) Income tax benefit 26,351 49,040 — — 75,391 Net income (loss) including non-controlling interests (257,273) (149,295) 107,849 52,353 (246,366) Less: Net income attributable to non-controlling interests — — 73,075 (62,168) 10,907 Net income (loss) attributable to Oasis $ (257,273) $ (149,295) $ 34,774 $ 114,521 $ (257,273)
Condensed Consolidating Statement of Cash Flows	Condensed Consolidating Statement of Cash Flows Nine Months Ended September 30, 2019 Parent/ Combined Combined Intercompany Consolidated (In thousands) Cash flows from operating activities: Net income (loss) including non-controlling interests $ (51,837) $ 39,118 $ 147,676 $ (161,450) $ (26,493) Adjustments to reconcile net income (loss) including non-controlling interests to net cash provided by (used in) operating activities: Equity in earnings of subsidiaries (39,118) (114,570) — 153,688 — Depreciation, depletion and amortization — 566,812 26,474 (15,263) 578,023 Loss on sale of properties — 3,950 — — 3,950 Impairment — 653 — — 653 Deferred income taxes (23,431) 14,591 — — (8,840) Derivative instruments — 34,940 — — 34,940 Equity-based compensation expenses 13,933 12,134 303 — 26,370 Deferred financing costs amortization and other 12,582 4,948 660 — 18,190 Working capital and other changes: Change in accounts receivable, net 94,214 9,858 (1,255) (101,262) 1,555 Change in inventory — (3,676) — — (3,676) Change in prepaid expenses 283 3,416 454 — 4,153 Change in accounts payable, interest payable and accrued liabilities (13,684) (63,125) (2,173) 101,262 22,280 Change in other assets and liabilities, net — (9,258) (1,953) — (11,211) Net cash provided by (used in) operating activities (7,058) 499,791 170,186 (23,025) 639,894 Cash flows from investing activities: Capital expenditures — (543,420) (170,850) — (714,270) Acquisitions — (8,337) — — (8,337) Proceeds from sale of properties — 41,039 — — 41,039 Derivative settlements — 10,752 — — 10,752 Net cash used in investing activities — (499,966) (170,850) — (670,816) Cash flows from financing activities: Proceeds from Revolving Credit Facilities — 1,533,000 118,000 — 1,651,000 Principal payments on Revolving Credit Facilities — (1,595,000) (5,000) — (1,600,000) Deferred financing costs — (41) (811) — (852) Purchases of treasury stock (4,625) — — — (4,625) Distributions to non-controlling interests — — (69,667) 54,116 (15,551) Investment in subsidiaries / capital contributions from parent 11,649 62,824 (43,382) (31,091) — Payments on finance lease liabilities — (1,364) (59) — (1,423) Other — 2 (394) — (392) Net cash provided by (used in) financing activities 7,024 (579) (1,313) 23,025 28,157 Decrease in cash and cash equivalents (34) (754) (1,977) — (2,765) Cash and cash equivalents at beginning of period 179 15,362 6,649 — 22,190 Cash and cash equivalents at end of period $ 145 $ 14,608 $ 4,672 $ — $ 19,425
Condensed Consolidating Statement of Cash Flows	Condensed Consolidating Statement of Cash Flows Nine Months Ended September 30, 2018 Parent/ Combined Combined Intercompany Consolidated (In thousands) Cash flows from operating activities: Net income (loss) including non-controlling interests $ (257,273) $ (149,295) $ 107,849 $ 52,353 $ (246,366) Adjustments to reconcile net income (loss) including non-controlling interests to net cash provided by (used in) operating activities: Equity in earnings (loss) of subsidiaries 149,295 (90,689) — (58,606) — Depreciation, depletion and amortization — 456,624 20,212 (11,017) 465,819 Loss on extinguishment of debt 13,698 — — — 13,698 Gain on sale of properties — (38,823) — — (38,823) Impairment — 384,228 — — 384,228 Deferred income taxes (26,351) (49,067) — — (75,418) Derivative instruments — 239,945 — — 239,945 Equity-based compensation expenses 20,292 1,014 280 — 21,586 Deferred financing costs amortization and other 11,955 7,884 235 — 20,074 Working capital and other changes: Change in accounts receivable, net (227,589) (77,231) 8,747 234,798 (61,275) Change in inventory — (12,076) — — (12,076) Change in prepaid expenses (350) 864 682 — 1,196 Change in accounts payable, interest payable and accrued liabilities (12,270) 278,481 18,895 (234,798) 50,308 Change in other assets and liabilities, net — (895) — — (895) Net cash provided by (used in) operating activities (328,593) 950,964 156,900 (17,270) 762,001 Cash flows from investing activities: Capital expenditures — (621,269) (219,819) — (841,088) Acquisitions — (579,886) — — (579,886) Proceeds from sale of properties — 333,029 — — 333,029 Costs related to sale of properties — (2,707) — — (2,707) Derivative settlements — (162,013) — — (162,013) Other — (1,038) — — (1,038) Net cash used in investing activities — (1,033,884) (219,819) — (1,253,703) Cash flows from financing activities: Proceeds from Revolving Credit Facilities — 2,376,000 123,000 — 2,499,000 Principal payments on Revolving Credit Facilities — (1,924,000) (35,000) — (1,959,000) Repurchase of senior unsecured notes (423,190) — — — (423,190) Proceeds from issuance of senior unsecured convertible notes 400,000 — — — 400,000 Deferred financing costs (7,058) (261) (331) — (7,650) Purchases of treasury stock (6,806) — — — (6,806) Distributions to non-controlling interests — — (103,065) 92,672 (10,393) Investment in subsidiaries / capital contributions from parent 365,601 (372,621) 82,422 (75,402) — Other 38 (125) — — (87) Net cash provided by financing activities 328,585 78,993 67,026 17,270 491,874 Increase (decrease) in cash and cash equivalents (8) (3,927) 4,107 — 172 Cash and cash equivalents at beginning of period 178 15,659 883 — 16,720 Cash and cash equivalents at end of period $ 170 $ 11,732 $ 4,990 $ — $ 16,892

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Impacts of Revisions to the Company’s Condensed Consolidated Statement of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenues	$ 482,743	$ 674,629	$ 1,587,880	$ 1,722,192
Total operating expenses	473,550	532,453	1,453,473	1,711,659
Net income (loss) attributable to Oasis	$ 20,288	$ 62,341	$ (51,837)	$ (257,273)
Basic (in dollars per share)		$ 0.20	$ (0.16)	$ (0.84)
Diluted (in dollars per share)		$ 0.20	$ (0.16)	$ (0.84)
As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenues		$ 546,448		$ 1,469,001
Total operating expenses		404,272		1,458,468
Net income (loss) attributable to Oasis		$ 62,341		$ (257,273)
Basic (in dollars per share)	$ 0.06	$ 0.20		$ (0.84)
Diluted (in dollars per share)	$ 0.06	$ 0.20		$ (0.84)
Revision
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenues		$ 128,181		$ 253,191
Total operating expenses		128,181		253,191
Net income (loss) attributable to Oasis		$ 0		$ 0
Basic (in dollars per share)		$ 0		$ 0
Diluted (in dollars per share)		$ 0		$ 0
Oil and gas revenues
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenues	$ 344,470	$ 454,195	$ 1,070,256	$ 1,218,639
Oil and gas revenues | As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenues		452,643		1,212,235
Oil and gas revenues | Revision
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenues		1,552		6,404
Purchased oil and gas
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenues	79,352	172,985	337,212	368,758
Purchased oil and gas expenses	$ 78,655	174,269	$ 338,221	374,442
Purchased oil and gas | As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenues		46,356		121,971
Purchased oil and gas expenses		46,088		121,251
Purchased oil and gas | Revision
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenues		126,629		246,787
Purchased oil and gas expenses		$ 128,181		$ 253,191

Oasis Midstream Partners (Detai

Oasis Midstream Partners (Details) - USD ($)	Nov. 01, 2019	Feb. 22, 2019	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2018
2019 Capital Expenditures Arrangement | Oasis Midstream Partners, LP | OMP
Related Party Transaction [Line Items]
Capital contributions / capital expenditures expected to be made		$ 80,000,000	$ 13,400,000	$ 66,200,000
Assignment of Midstream Assets in Delaware Basin | Oasis Midstream Partners, LP | OMP | Subsequent Event
Related Party Transaction [Line Items]
Capital contributions / capital expenditures expected to be made	$ 25,000,000
Purchase and sale rights expiration period	2 years
Bobcat DevCo | OMS Holdings LLC (“OMS”)
Related Party Transaction [Line Items]
Ownership interest (percent)			65.60%	65.60%	75.00%

Revenue Recognition - Disaggreg

Revenue Recognition - Disaggregated Revenue (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Total revenues	$ 482,743,000	$ 674,629,000	$ 1,587,880,000	$ 1,722,192,000
Contract asset	0		0		$ 0
Contract liability	0		0		$ 0
Exploration and Production Revenues
Disaggregation of Revenue [Line Items]
Total revenues	423,822,000	625,342,000	1,407,440,000	1,585,204,000
Midstream Services
Disaggregation of Revenue [Line Items]
Total revenues	123,411,000	75,770,000	349,438,000	209,739,000
Well Services
Disaggregation of Revenue [Line Items]
Total revenues	30,409,000	56,439,000	102,321,000	161,242,000
Operating Segments | Exploration and Production Revenues
Disaggregation of Revenue [Line Items]
Total revenues	423,822,000	625,342,000	1,407,440,000	1,585,204,000
Operating Segments | Exploration and Production Revenues | Crude oil revenues
Disaggregation of Revenue [Line Items]
Total revenues	318,564,000	414,082,000	964,662,000	1,103,575,000
Operating Segments | Exploration and Production Revenues | Purchased crude oil sales
Disaggregation of Revenue [Line Items]
Total revenues	77,018,000	169,531,000	330,594,000	364,404,000
Operating Segments | Exploration and Production Revenues | Natural gas and NGL revenues
Disaggregation of Revenue [Line Items]
Total revenues	25,906,000	40,113,000	105,594,000	115,064,000
Operating Segments | Exploration and Production Revenues | Purchased natural gas sales
Disaggregation of Revenue [Line Items]
Total revenues	2,334,000	1,616,000	6,590,000	2,161,000
Operating Segments | Midstream Services
Disaggregation of Revenue [Line Items]
Total revenues	50,023,000	33,025,000	149,645,000	90,644,000
Operating Segments | Midstream Services | Purchased crude oil sales
Disaggregation of Revenue [Line Items]
Total revenues	0	1,838,000	28,000	2,193,000
Operating Segments | Midstream Services | Crude oil and natural gas revenues
Disaggregation of Revenue [Line Items]
Total revenues	21,653,000	18,188,000	69,189,000	54,124,000
Operating Segments | Midstream Services | Produced and flowback water revenues
Disaggregation of Revenue [Line Items]
Total revenues	10,803,000	9,985,000	29,309,000	27,919,000
Operating Segments | Midstream Services | Total midstream service revenues
Disaggregation of Revenue [Line Items]
Total revenues	32,456,000	28,173,000	98,498,000	82,043,000
Operating Segments | Midstream Services | Natural gas and NGL revenues
Disaggregation of Revenue [Line Items]
Total revenues	16,424,000	0	46,541,000	0
Operating Segments | Midstream Services | Freshwater revenues
Disaggregation of Revenue [Line Items]
Total revenues	1,143,000	3,014,000	4,578,000	6,408,000
Operating Segments | Midstream Services | Total midstream product revenues
Disaggregation of Revenue [Line Items]
Total revenues	17,567,000	4,852,000	51,147,000	8,601,000
Operating Segments | Well Services
Disaggregation of Revenue [Line Items]
Total revenues	8,898,000	16,262,000	30,795,000	46,344,000
Operating Segments | Well Services | Hydraulic fracturing revenues
Disaggregation of Revenue [Line Items]
Total revenues	8,228,000	14,985,000	28,631,000	42,801,000
Operating Segments | Well Services | Equipment rental revenues
Disaggregation of Revenue [Line Items]
Total revenues	$ 670,000	$ 1,277,000	$ 2,164,000	$ 3,543,000

Revenue Recognition - Remaining

Revenue Recognition - Remaining Performance Obligation (Details) $ in Thousands	Sep. 30, 2019USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-09-30
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 95,129
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 3,003
Remaining performance obligation satisfaction period	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 20,501
Remaining performance obligation satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 25,082
Remaining performance obligation satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 19,259
Remaining performance obligation satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 12,642
Remaining performance obligation satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 14,642
Remaining performance obligation satisfaction period

Inventory- Schedule of Inventor

Inventory- Schedule of Inventory (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Inventory
Crude oil inventory	$ 14,823	$ 14,933
Equipment and materials	21,935	18,195
Total inventory	36,758	33,128
Long-term inventory
Linefill in third party pipelines	14,395	12,260
Total long-term inventory	14,395	12,260
Total	$ 51,153	$ 45,388

Accounts Receivable (Details)

Accounts Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	$ 383,234	$ 389,128
Allowance for doubtful accounts	(1,617)	(1,526)
Total accounts receivable, net	381,617	387,602
Trade accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	262,966	245,546
Joint interest accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	107,254	133,375
Other accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	$ 13,014	$ 10,207

Fair Value Measurements - Hiera

Fair Value Measurements - Hierarchy of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - Recurring - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Assets:
Total assets	$ 62,054	$ 107,018
Liabilities:
Total liabilities	830	104
Commodity derivative instruments
Liabilities:
Total liabilities	830	104
Money market funds
Assets:
Total assets	145	143
Commodity derivative instruments
Assets:
Total assets	61,909	106,875
Level 1
Assets:
Total assets	145	143
Liabilities:
Total liabilities	0	0
Level 1 | Commodity derivative instruments
Liabilities:
Total liabilities	0	0
Level 1 | Money market funds
Assets:
Total assets	145	143
Level 1 | Commodity derivative instruments
Assets:
Total assets	0	0
Level 2
Assets:
Total assets	61,909	106,875
Liabilities:
Total liabilities	830	104
Level 2 | Commodity derivative instruments
Liabilities:
Total liabilities	830	104
Level 2 | Money market funds
Assets:
Total assets	0	0
Level 2 | Commodity derivative instruments
Assets:
Total assets	61,909	106,875
Level 3
Assets:
Total assets	0	0
Liabilities:
Total liabilities	0	0
Level 3 | Commodity derivative instruments
Liabilities:
Total liabilities	0	0
Level 3 | Money market funds
Assets:
Total assets	0	0
Level 3 | Commodity derivative instruments
Assets:
Total assets	$ 0	$ 0

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Derivative credit risk valuation adjustment, derivative assets	$ 0.1	$ 0.2

Derivative Instruments - Schedu

Derivative Instruments - Schedule of Outstanding Commodity Derivative Instruments (Details) $ in Thousands	1 Months Ended	9 Months Ended
	Nov. 06, 2019$ / bblbbl	Sep. 30, 2019USD ($)MMBTU$ / bblbbl
Derivative [Line Items]
Fair value assets (liabilities) | $		$ 61,079
NYMEX WTI | Crude Oil | 2019 Fixed price swaps
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl		2,275,000
Average swap price (in dollars per barrel)		57.49
Fair value assets (liabilities) | $		$ 5,744
NYMEX WTI | Crude Oil | 2019 Two-way collar
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl		1,274,000
Average floor price (in dollars per barrel)		58.07
Average ceiling price (in dollars per barrel)		74.64
Fair value assets (liabilities) | $		$ 5,002
NYMEX WTI | Crude Oil | 2019 Three-way collar
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl		1,092,000
Average sub-floor price (in dollars per barrel)		40
Average floor price (in dollars per barrel)		51.57
Average ceiling price (in dollars per barrel)		65.40
Fair value assets (liabilities) | $		$ 768
NYMEX WTI | Crude Oil | 2020 Fixed price swaps
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl		3,418,000
Average swap price (in dollars per barrel)		58.69
Fair value assets (liabilities) | $		$ 21,461
NYMEX WTI | Crude Oil | 2020 Two-way collar
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl		2,378,000
Average floor price (in dollars per barrel)		52.11
Average ceiling price (in dollars per barrel)		62.98
Fair value assets (liabilities) | $		$ 7,609
NYMEX WTI | Crude Oil | 2020 Three-way collar
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl		4,574,000
Average sub-floor price (in dollars per barrel)		40
Average floor price (in dollars per barrel)		53.26
Average ceiling price (in dollars per barrel)		64.48
Fair value assets (liabilities) | $		$ 15,871
NYMEX WTI | Crude Oil | 2021 Fixed price swaps
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl		93,000
Average swap price (in dollars per barrel)		58.85
Fair value assets (liabilities) | $		$ 770
NYMEX WTI | Crude Oil | 2021 Two-way collar
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl		62,000
Average floor price (in dollars per barrel)		50.50
Average ceiling price (in dollars per barrel)		60.70
Fair value assets (liabilities) | $		$ 245
NYMEX WTI | Crude Oil | 2021 Three-way collar
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl		734,000
Average sub-floor price (in dollars per barrel)		40
Average floor price (in dollars per barrel)		51.26
Average ceiling price (in dollars per barrel)		64.05
Fair value assets (liabilities) | $		$ 2,101
NYMEX WTI | Subsequent Event | Crude Oil | 2020 Fixed price swaps
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl	2,005,200
NYMEX WTI | Subsequent Event | Crude Oil | 2021 Two-way collar
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl	74,400
Average floor price (in dollars per barrel)	54.25
Houston NYMEX WTI | Crude Oil | 2019 Basis swaps
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl		90,000
Average swap price (in dollars per barrel)		4.55
Fair value assets (liabilities) | $		$ 142
NYMEX HH | Natural Gas | 2019 Fixed price swaps
Derivative [Line Items]
Total notional amount of natural gas (in MMBtu) | MMBTU		2,760,000
Average swap price (in dollars per barrel)		2.92
Fair value assets (liabilities) | $		$ 1,366

Derivative Instruments - Realiz

Derivative Instruments - Realized and Unrealized Gains and Losses from Commodity Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Net gain (loss) on derivative instruments	$ 47,922	$ (48,544)	$ (34,940)	$ (239,945)

Derivative Instruments - Sche_2

Derivative Instruments - Schedule of Location and Fair Value of Outstanding Commodity Derivative Instruments (Details) - Commodity derivative instruments - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Derivative asset, gross amounts recognized	$ 80,006	$ 118,980
Derivative liability, gross amount recognized	1,428	104
Derivative asset, gross amounts offset	(18,097)	(12,105)
Derivative liability, gross amounts offset	(598)	0
Derivative asset, net asset	61,909	106,875
Derivative liability, net liability	830	104
Current assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amounts recognized	63,743	110,729
Derivative asset, gross amounts offset	(11,563)	(10,799)
Derivative asset, net asset	52,180	99,930
Noncurrent assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amounts recognized	16,263	8,251
Derivative asset, gross amounts offset	(6,534)	(1,306)
Derivative asset, net asset	9,729	6,945
Current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	1,428	84
Derivative liability, gross amounts offset	(598)	0
Derivative liability, net liability	830	84
Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	0	20
Derivative liability, gross amounts offset	0	0
Derivative liability, net liability	$ 0	$ 20

Property, Plant and Equipment -

Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Proved oil and gas properties	$ 8,550,060	$ 7,878,104
Less: Accumulated depreciation, depletion, amortization and impairment	(3,400,802)	(2,853,353)
Proved oil and gas properties, net	5,149,258	5,024,751
Unproved oil and gas properties	824,446	1,034,085
Other property and equipment	1,339,268	1,151,772
Less: Accumulated depreciation	(223,362)	(183,499)
Other property and equipment, net	1,115,906	968,273
Total property, plant and equipment, net	$ 7,089,610	$ 7,027,109

Property, Plant and Equipment_2

Property, Plant and Equipment - Additional Information (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Proved Oil And Gas Properties
Property, Plant and Equipment [Line Items]
Estimate of future asset retirement costs	$ 42.2	$ 40.5
Property, Plant and Equipment, Other Types
Property, Plant and Equipment [Line Items]
Estimate of future asset retirement costs	$ 1.4	$ 1.3

Divestitures and Assets Held _2

Divestitures and Assets Held for Sale (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	9 Months Ended
	Oct. 31, 2019	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of properties			$ 41,039	$ 333,029
Foreman Butte Area | Divestitures
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposition of oil and gas property			(3,200)
Partial interests in certain oil and gas properties | Exploration and Production Revenues | Divestitures
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposition of oil and gas property		$ (700)	(700)
2019 Divestitures | Held for Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Exploration and production capital expenditures		6,700	6,700
Proceeds from sale of properties		$ 500	$ 500
2019 Divestitures | Subsequent Event | Held for Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposition of oil and gas property	$ 500

Discontinued Operations and D_2

Discontinued Operations and Disposal Groups - Balance Sheet Data Related to Assets and Liabilities Held for Sale (Details) - Held for Sale - 2019 Divestitures $ in Thousands	Sep. 30, 2019USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Oil and gas properties (successful efforts method)	$ 6,700
Less: accumulated depreciation, depletion, amortization and impairment	0
Total assets held for sale, net	6,700
Accrued liabilities	6,700
Total liabilities held for sale	$ 6,700

Long-Term Debt - Schedule of Lo

Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total long-term debt	$ 2,798,859	$ 2,735,276
Senior Notes
Debt Instrument [Line Items]
Total principal of senior unsecured notes and revolving line of credit	2,039,409	2,039,409
Less: unamortized deferred financing costs on senior unsecured notes	$ (17,309)	(20,865)
Senior Notes | 6.50% senior unsecured notes due November 1, 2021
Debt Instrument [Line Items]
Stated interest rate (as percent)	6.50%
Total principal of senior unsecured notes and revolving line of credit	$ 71,835	71,835
Senior Notes | 6.875% senior unsecured notes due March 15, 2022
Debt Instrument [Line Items]
Stated interest rate (as percent)	6.875%
Total principal of senior unsecured notes and revolving line of credit	$ 901,480	901,480
Senior Notes | 6.875% senior unsecured notes due January 15, 2023
Debt Instrument [Line Items]
Stated interest rate (as percent)	6.875%
Total principal of senior unsecured notes and revolving line of credit	$ 366,094	366,094
Senior Notes | 6.25% senior unsecured notes due May 1, 2026
Debt Instrument [Line Items]
Stated interest rate (as percent)	6.25%
Total principal of senior unsecured notes and revolving line of credit	$ 400,000	400,000
Senior Notes | 2.625% senior unsecured convertible notes due September 15, 2023
Debt Instrument [Line Items]
Stated interest rate (as percent)	2.625%
Total principal of senior unsecured notes and revolving line of credit	$ 300,000	300,000
Less: unamortized debt discount on senior unsecured convertible notes	(60,241)	(69,268)
Total long-term debt	300,000
Revolving Credit Facility | Credit Facility | Oasis Credit Facility
Debt Instrument [Line Items]
Total principal of senior unsecured notes and revolving line of credit	406,000	468,000
Total long-term debt	406,000
Revolving Credit Facility | Credit Facility | OMP Credit Facility
Debt Instrument [Line Items]
Total principal of senior unsecured notes and revolving line of credit	431,000	$ 318,000
Total long-term debt	$ 431,000

Long-Term Debt - Additional Inf

Long-Term Debt - Additional Information (Details)	9 Months Ended
	Sep. 30, 2019USD ($)day$ / shares	Nov. 04, 2019USD ($)	Aug. 16, 2019USD ($)	May 06, 2019USD ($)	May 05, 2019USD ($)	Apr. 15, 2019USD ($)	Dec. 31, 2018USD ($)
Debt Instrument [Line Items]
Total long-term debt	$ 2,798,859,000						$ 2,735,276,000
Unsecured Senior Notes
Debt Instrument [Line Items]
Long-term debt, fair value	1,792,400,000
Senior Notes | 2022 and 2023 Notes
Debt Instrument [Line Items]
Total long-term debt	1,267,600,000
Senior Notes | 2.625% senior unsecured convertible notes due September 15, 2023
Debt Instrument [Line Items]
Total long-term debt	$ 300,000,000
Stated interest rate (as percent)	2.625%
Debt issued	$ 300,000,000
Debt conversion rate per $1000 principal (in shares per $1000)	0.076365
Debt conversion price (in dollars per share) | $ / shares	$ 13.10
Senior Notes | Notes
Debt Instrument [Line Items]
Unsecured debt	$ 1,739,400,000
Senior Notes | Notes | Minimum
Debt Instrument [Line Items]
Stated interest rate (as percent)	6.25%
Senior Notes | Notes | Maximum
Debt Instrument [Line Items]
Stated interest rate (as percent)	6.875%
Senior Notes | Debt Conversion Scenario 1 | 2.625% senior unsecured convertible notes due September 15, 2023
Debt Instrument [Line Items]
Number of trading days | day	20
Number of consecutive trading days | day	30
Stock price relative to conversion price (percent)	130.00%
Senior Notes | Debt Conversion Scenario 2 | 2.625% senior unsecured convertible notes due September 15, 2023
Debt Instrument [Line Items]
Number of trading days | day	5
Number of consecutive trading days | day	5
Stock price relative to product of sale price and conversion rate (percent)	98.00%
Revolving Credit Facility | Credit Facility
Debt Instrument [Line Items]
Line of credit facility amount	$ 3,000,000,000
Credit facility borrowing base						$ 1,600,000,000
Line of credit facility, current borrowing capacity						1,350,000,000
Revolving Credit Facility | Credit Facility | Subsequent Event
Debt Instrument [Line Items]
Credit facility borrowing base		$ 1,300,000,000
Line of credit facility, current borrowing capacity		$ 1,100,000,000
Revolving Credit Facility | Credit Facility | Oasis Credit Facility
Debt Instrument [Line Items]
Total long-term debt	$ 406,000,000
Weighted average interest rate (as percent)	3.80%
Letters of credit outstanding	$ 14,000,000
Line of credit facility, remaining borrowing capacity	930,000,000
Revolving Credit Facility | Credit Facility | OMP Credit Facility
Debt Instrument [Line Items]
Total long-term debt	431,000,000
Credit facility borrowing base	$ 575,000,000		$ 575,000,000	$ 475,000,000	$ 400,000,000
Weighted average interest rate (as percent)	4.10%
Letters of credit outstanding	$ 8,200,000
Line of credit facility, remaining borrowing capacity	$ 135,800,000
Maximum borrowing capacity subject to certain conditions			$ 775,000,000	$ 675,000,000
Revolving Credit Facility | Credit Facility | OMP Credit Facility | Minimum
Debt Instrument [Line Items]
Commitment fee percentage	0.375%
Revolving Credit Facility | Credit Facility | OMP Credit Facility | Maximum
Debt Instrument [Line Items]
Commitment fee percentage	0.50%
Revolving Credit Facility | Credit Facility | LIBOR | Minimum
Debt Instrument [Line Items]
Commitment fee percentage	0.375%
Revolving Credit Facility | Credit Facility | LIBOR | Maximum
Debt Instrument [Line Items]
Commitment fee percentage	0.50%
Revolving Credit Facility | Swingline Loan
Debt Instrument [Line Items]
Credit facility borrowing base						$ 50,000,000

Asset Retirement Obligations -

Asset Retirement Obligations - Schedule of Changes in Asset Retirement Obligations (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019USD ($)
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
December 31, 2018	$ 52,449
Liabilities incurred during period	1,436
Liabilities settled during period	(644)
Accretion expense during period	2,187
Revisions to estimates	647
September 30, 2019	$ 56,075

Asset Retirement Obligations _2

Asset Retirement Obligations - Additional Information (Details) $ in Millions	Sep. 30, 2019USD ($)
Asset Retirement Obligation Disclosure [Abstract]
Total asset retirement obligations, current portion	$ 0.6

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Effective tax rate (as percent)	(134.30%)	27.20%	25.00%	23.40%
Pre-tax income (loss)	$ 12,939	$ 91,005	$ (35,328)	$ (321,757)

Equity-Based Compensation - Add

Equity-Based Compensation - Additional Information (Details) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019USD ($)shares	Sep. 30, 2018USD ($)	Sep. 30, 2019USD ($)day$ / sharesshares	Sep. 30, 2018USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expenses | $			$ 26,370	$ 21,586
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			3 years
Stock granted (in shares) | shares			4,051,325
Granted, weighted average grant date fair value per unit (in usd per share) | $ / shares			$ 6.62
Equity-based compensation expenses | $	$ 5,800	$ 5,100	$ 18,400	14,700
Performance Share Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock granted (in shares) | shares			1,685,090
Granted, weighted average grant date fair value per unit (in usd per share) | $ / shares			$ 6.80
Equity-based compensation expenses | $	$ 2,500	2,200	$ 7,500	6,300
Right to received shares of common stock (in shares) | shares	1		1
Number of trading days | day			30
Performance Share Unit Awards | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
PSU granted percentage of earnings (as a percent)			0.00%
Performance Share Unit Awards | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
PSU granted percentage of earnings (as a percent)			200.00%
Phantom Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			3 years
Stock granted (in shares) | shares			341,290
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			1 year
Stock granted (in shares) | shares			16,170
Granted, weighted average grant date fair value per unit (in usd per share) | $ / shares			$ 18.57
Oasis Midstream Partners, LP | Phantom Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, weighted average grant date fair value per unit (in usd per share) | $ / shares			$ 18.57
Equity-based compensation expenses | $	$ 100	200	$ 1,800	400
OMP General Partner LLC | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expenses | $	$ 100	$ 100	$ 300	$ 300

Equity-Based Compensation - Sum

Equity-Based Compensation - Summary of Assumptions (Details) - Performance Share Units	9 Months Ended
	Sep. 30, 2019$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Oasis volatility (as percent)	71.17%
Oasis initial value (usd per share)	$ 5.85
Oasis stock price on date of grant (usd per share)	$ 6.63
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate (as percent)	2.55%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate (as percent)	2.56%

Earnings (Loss) Per Share - Sch

Earnings (Loss) Per Share - Schedule of Weighted-Average Number of Shares Outstanding (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Basic and diluted weighted average common shares outstanding (shares)	315,135	313,167	314,863	305,533
Diluted weighted average common shares outstanding (in shares)	315,135	316,387	314,863	305,533
Restricted Stock Awards and PSUs
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of restricted stock awards and PSUs (shares)	0	3,220	0	0

Earnings (Loss) Per Share - S_2

Earnings (Loss) Per Share - Schedule of Common Shares Excluded from Diluted Earnings (Loss) per Share (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Restricted stock awards and PSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive stock-based compensation awards (in shares)	9,825	4,180	10,106	7,284

Business Segment Information -

Business Segment Information - Additional Information (Details)	9 Months Ended
	Sep. 30, 2019Segment
Segment Reporting [Abstract]
Number of current operating units	3

Business Segment Information _2

Business Segment Information - Summarized Financial Information of Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total revenues	$ 482,743	$ 674,629	$ 1,587,880	$ 1,722,192
Operating income (loss)	8,441	179,045	130,457	49,356
Other income (expense), net	4,498	(88,040)	(165,785)	(371,113)
Income (loss) before income taxes	12,939	91,005	(35,328)	(321,757)
General and administrative	52,860	34,859	118,245	91,029
Equity-based compensation	8,446	7,456	26,370	21,586
Property, plant and equipment, net	7,089,610		7,089,610		$ 7,027,109
Total assets	7,666,977		7,666,977		7,626,142
Exploration and Production Revenues
Segment Reporting Information [Line Items]
Total revenues	423,822	625,342	1,407,440	1,585,204
Midstream Services
Segment Reporting Information [Line Items]
Total revenues	123,411	75,770	349,438	209,739
Well Services
Segment Reporting Information [Line Items]
Total revenues	30,409	56,439	102,321	161,242
Operating Segments | Exploration and Production Revenues
Segment Reporting Information [Line Items]
Total revenues	423,822	625,342	1,407,440	1,585,204
Operating income (loss)	(51,476)	146,969	(30,657)	(53,159)
Other income (expense), net	8,871	(87,594)	(153,481)	(370,311)
Income (loss) before income taxes	(42,605)	59,375	(184,138)	(423,470)
General and administrative	46,377	30,454	99,665	77,425
Equity-based compensation	8,246	7,102	25,348	20,565
Property, plant and equipment, net	6,236,331		6,236,331		6,311,566
Total assets	6,736,948		6,736,948		6,838,987
Operating Segments | Midstream Services
Segment Reporting Information [Line Items]
Total revenues	50,023	33,025	149,645	90,644
Operating income (loss)	64,299	31,326	169,321	101,457
Other income (expense), net	(4,512)	(367)	(12,460)	(703)
Income (loss) before income taxes	59,787	30,959	156,861	100,754
General and administrative	7,842	5,614	24,683	18,107
Equity-based compensation	383	442	1,363	1,222
Property, plant and equipment, net	1,052,558		1,052,558		893,285
Total assets	1,088,728		1,088,728		920,619
Operating Segments | Well Services
Segment Reporting Information [Line Items]
Total revenues	8,898	16,262	30,795	46,344
Operating income (loss)	236	9,237	2,538	25,415
Other income (expense), net	139	(79)	156	(99)
Income (loss) before income taxes	375	9,158	2,694	25,316
General and administrative	6,489	5,437	20,038	17,084
Equity-based compensation	42	354	1,130	1,149
Property, plant and equipment, net	27,712		27,712		38,871
Total assets	33,292		33,292		48,150
Inter-segment | Exploration and Production Revenues
Segment Reporting Information [Line Items]
Total revenues	0	0	0	0
Inter-segment | Midstream Services
Segment Reporting Information [Line Items]
Total revenues	73,388	42,745	199,793	119,095
Inter-segment | Well Services
Segment Reporting Information [Line Items]
Total revenues	21,511	40,177	71,526	114,898
Eliminations
Segment Reporting Information [Line Items]
Total revenues	(94,899)	(82,922)	(271,319)	(233,993)
Operating income (loss)	(4,618)	(8,487)	(10,745)	(24,357)
Other income (expense), net	0	0	0	0
Income (loss) before income taxes	(4,618)	(8,487)	(10,745)	(24,357)
General and administrative	(7,848)	(6,646)	(26,141)	(21,587)
Equity-based compensation	(225)	$ (442)	(1,471)	$ (1,350)
Property, plant and equipment, net	(226,991)		(226,991)		(216,613)
Total assets	$ (191,991)		$ (191,991)		$ (181,614)

Leases - Narrative (Details)

Leases - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Operating lease assets	$ 21,255
Operating lease liabilities	27,145
Finance lease ROU assets	7,406
Finance lease liabilities	$ 7,447
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Operating lease assets		$ 31,100
Operating lease liabilities		37,100
Finance lease ROU assets		6,000
Finance lease liabilities		$ 6,000

Leases - Components of lease ex

Leases - Components of lease expense (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Lease, Cost [Abstract]
Operating lease costs	$ 4,986	$ 23,461
Variable lease costs	1,730	6,733
Short-term lease costs	1,048	2,418
Amortization of ROU assets	694	1,910
Interest on lease liabilities	72	196
Total lease costs	$ 8,530	$ 34,718

Leases - Maturities of the Comp

Leases - Maturities of the Company's lease liabilities (Details) $ in Thousands	Sep. 30, 2019USD ($)
Operating Leases
2019 (excluding the nine months ended September 30, 2019)	$ 3,232
2020	7,080
2021	2,704
2022	3,073
2023	2,365
Thereafter	12,802
Total future lease payments	31,256
Less: Imputed interest	4,111
Present value of future lease payments	27,145
Finance Leases
2019 (excluding the nine months ended September 30, 2019)	729
2020	2,909
2021	2,136
2022	1,367
2023	274
Thereafter	684
Total future lease payments	8,099
Less: Imputed interest	652
Present value of future lease payments	$ 7,447

Leases - Schedule of future min

Leases - Schedule of future minimum annual rental commitments (Details) $ in Thousands	Dec. 31, 2018USD ($)
Leases [Abstract]
2019	$ 8,723
2020	7,009
2021	6,005
2022	5,130
2023	4,361
Thereafter	13,134
Total future minimum lease payments	$ 44,362

Leases - Supplemental balance s

Leases - Supplemental balance sheet information (Details) $ in Thousands	Sep. 30, 2019USD ($)
Leases [Abstract]
Operating right-of-use assets	$ 21,255
Finance lease assets	7,406
Total lease assets	28,661
Operating lease liabilities, current	8,050
Finance lease liabilities, current	2,698
Operating lease liabilities, noncurrent	19,095
Finance lease liabilities, noncurrent	4,748
Total lease liabilities	34,591
Finance lease ROU assets accumulated amortization	$ 1,900

Leases - Schedule of supplement

Leases - Schedule of supplemental cash flow information and non-cash transactions related to Company's leases (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Leases [Abstract]
Operating cash flows from operating leases	$ 24,985
Operating cash flows from finance leases	196
Financing cash flows from finance leases	1,423	$ 0
Right-of-use assets obtained in exchange for operating lease obligations	12,746
Right-of-use assets obtained in exchange for finance lease obligations	$ 3,427

Leases - Weighted-average remai

Leases - Weighted-average remaining lease term and discount rate for the Company’s leases (Details)	Sep. 30, 2019
Leases [Abstract]
Weighted average remaining lease term - operating leases	6 years 8 months 12 days
Weighted average discount rate (percent) - operating leases	3.60%
Weighted average remaining lease term - finance leases	4 years 1 month 6 days
Weighted average discount rate (percent) - finance leases	3.80%

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) bbl in Millions, Bcf in Millions	Nov. 01, 2019USD ($)	Mar. 23, 2017USD ($)	Sep. 30, 2019USD ($)bblBcf
Commitments and Contingencies [Line Items]
Required delivery time-frame under volume commitments time frame agreements			25 years
Estimable future commitments under agreements			$ 612,100,000
Loss contingency accrual			$ 20,000,000
Mirada Litigation | Pending
Commitments and Contingencies [Line Items]
Damages sought (in excess of)		$ 100,000,000
Mirada Litigation | Pending | Subsequent Event
Commitments and Contingencies [Line Items]
Damages sought (in excess of)	$ 200,000,000
Crude Oil
Commitments and Contingencies [Line Items]
Minimum quantity to be delivered or transported (in MMBbl) | bbl			47.6
Natural gas liquids
Commitments and Contingencies [Line Items]
Minimum quantity to be delivered or transported (in MMBbl) | bbl			37.3
Natural Gas
Commitments and Contingencies [Line Items]
Minimum quantity to be delivered or transported (in MMBbl) | Bcf			869.5
Water
Commitments and Contingencies [Line Items]
Minimum quantity to be delivered or transported (in MMBbl) | bbl			18.1

Condensed Consolidating Finan_3

Condensed Consolidating Financial Information - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Ownership percentage, guarantors (as percent)			100.00%
Investments in and advances to subsidiaries	$ 0		$ 0		$ 0
Oasis share of stockholders’ equity	3,705,326		3,705,326		3,734,576
Non-controlling interests	194,335		194,335		184,304
Equity in earnings of subsidiaries	0	$ 0	0	$ 0
Net income attributable to non-controlling interest	10,023	3,882	25,344	10,907
Distributions to non-controlling interests			15,551	10,393
Intercompany Eliminations
Condensed Financial Statements, Captions [Line Items]
Investments in and advances to subsidiaries	(5,314,062)		(5,314,062)		(5,256,567)
Oasis share of stockholders’ equity	(5,213,479)		(5,213,479)		(5,139,158)
Non-controlling interests	(119,446)		(119,446)		(128,511)
Equity in earnings of subsidiaries	(97,072)	(129,657)	(153,688)	58,606
Net income attributable to non-controlling interest	(13,843)	(22,577)	(43,155)	(62,168)
Distributions to non-controlling interests			(54,116)	(92,672)
Intercompany Eliminations | (Overstated) / understated
Condensed Financial Statements, Captions [Line Items]
Investments in and advances to subsidiaries					20,700
Oasis share of stockholders’ equity					(163,600)
Non-controlling interests					184,300
Equity in earnings of subsidiaries		5,700		17,200
Net income attributable to non-controlling interest		3,900		10,900
Distributions to non-controlling interests				92,700
Parent/ Issuer
Condensed Financial Statements, Captions [Line Items]
Investments in and advances to subsidiaries	4,941,278		4,941,278		4,900,528
Oasis share of stockholders’ equity	3,705,325		3,705,325		3,734,576
Non-controlling interests	0		0		0
Equity in earnings of subsidiaries	54,755	96,555	39,118	(149,295)
Net income attributable to non-controlling interest	0	0	0	0
Distributions to non-controlling interests			0	0
Parent/ Issuer | (Overstated) / understated
Condensed Financial Statements, Captions [Line Items]
Investments in and advances to subsidiaries					(9,600)
Oasis share of stockholders’ equity					(9,600)
Combined Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Investments in and advances to subsidiaries	372,784		372,784		356,039
Oasis share of stockholders’ equity	4,941,278		4,941,278		4,900,528
Non-controlling interests	0		0		0
Equity in earnings of subsidiaries	42,317	33,102	114,570	90,689
Net income attributable to non-controlling interest	$ 0	0	0	0
Distributions to non-controlling interests			$ 0	0
Combined Guarantor Subsidiaries | (Overstated) / understated
Condensed Financial Statements, Captions [Line Items]
Investments in and advances to subsidiaries					(11,100)
Oasis share of stockholders’ equity					173,200
Non-controlling interests					$ (184,300)
Equity in earnings of subsidiaries		(5,700)		(17,200)
Net income attributable to non-controlling interest		$ (3,900)		(10,900)
Distributions to non-controlling interests				$ (92,700)

Condensed Consolidating Finan_4

Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 19,425			$ 22,190
Accounts receivable, net	381,617			387,602
Accounts receivable - affiliates	0			0
Inventory	36,758			33,128
Prepaid expenses	5,302			10,997
Derivative instruments	52,180			99,930
Intangible assets, net	0			125
Other current assets	332			183
Total current assets	495,614			554,155
Property, plant and equipment
Oil and gas properties (successful efforts method)	9,374,506			8,912,189
Other property and equipment	1,339,268			1,151,772
Less: accumulated depreciation, depletion, amortization and impairment	(3,624,164)			(3,036,852)
Total property, plant and equipment, net	7,089,610			7,027,109
Assets held for sale, net	6,700			0
Investments in and advances to subsidiaries	0			0
Derivative instruments	9,729			6,945
Deferred income taxes	0			0
Long-term inventory	14,395			12,260
Operating right-of-use assets	21,255
Other assets	29,674			25,673
Total assets	7,666,977			7,626,142
Current liabilities
Accounts payable	18,003			20,166
Accounts payable - affiliates	0			0
Revenues and production taxes payable	213,773			216,695
Accrued liabilities	325,445			331,651
Accrued interest payable	21,329			38,040
Derivative instruments	830			84
Advances from joint interest partners	3,649			5,140
Current operating lease liabilities	8,050
Other current liabilities	2,782			0
Total current liabilities	593,861			611,776
Long-term debt	2,798,859			2,735,276
Deferred income taxes	291,215			300,055
Asset retirement obligations	55,502			52,384
Derivative instruments	0			20
Liabilities held for sale	6,700			0
Operating lease liabilities	19,095
Other liabilities	2,084			7,751
Total liabilities	3,767,316			3,707,262
Stockholders’ equity
Oasis share of stockholders’ equity	3,705,326			3,734,576
Non-controlling interests	194,335			184,304
Total stockholders’ equity	3,899,661	$ 3,866,458	$ 3,811,135	3,918,880	$ 3,644,083	$ 3,574,251	$ 3,886,158	$ 3,513,579
Total liabilities and stockholders’ equity	7,666,977			7,626,142
Intercompany Eliminations
Current assets
Cash and cash equivalents	0			0
Accounts receivable, net	0			0
Accounts receivable - affiliates	(699,052)			(800,314)
Inventory	0			0
Prepaid expenses	0			0
Derivative instruments	0			0
Intangible assets, net				0
Other current assets	0			0
Total current assets	(699,052)			(800,314)
Property, plant and equipment
Oil and gas properties (successful efforts method)	(18,864)			(11,102)
Other property and equipment	0			0
Less: accumulated depreciation, depletion, amortization and impairment	0			0
Total property, plant and equipment, net	(18,864)			(11,102)
Assets held for sale, net	0
Investments in and advances to subsidiaries	(5,314,062)			(5,256,567)
Derivative instruments	0			0
Deferred income taxes	(243,100)			(219,670)
Long-term inventory	0			0
Operating right-of-use assets	0
Other assets	0			0
Total assets	(6,275,078)			(6,287,653)
Current liabilities
Accounts payable	0			0
Accounts payable - affiliates	(699,053)			(800,314)
Revenues and production taxes payable	0			0
Accrued liabilities	0			0
Accrued interest payable	0			0
Derivative instruments	0			0
Advances from joint interest partners	0			0
Current operating lease liabilities	0
Other current liabilities	0
Total current liabilities	(699,053)			(800,314)
Long-term debt	0			0
Deferred income taxes	(243,100)			(219,670)
Asset retirement obligations	0			0
Derivative instruments				0
Liabilities held for sale	0
Operating lease liabilities	0
Other liabilities	0			0
Total liabilities	(942,153)			(1,019,984)
Stockholders’ equity
Oasis share of stockholders’ equity	(5,213,479)			(5,139,158)
Non-controlling interests	(119,446)			(128,511)
Total stockholders’ equity	(5,332,925)			(5,267,669)
Total liabilities and stockholders’ equity	(6,275,078)			(6,287,653)
Parent/ Issuer
Current assets
Cash and cash equivalents	145			179
Accounts receivable, net	0			0
Accounts receivable - affiliates	549,167			643,382
Inventory	0			0
Prepaid expenses	90			373
Derivative instruments	0			0
Intangible assets, net				0
Other current assets	0			0
Total current assets	549,402			643,934
Property, plant and equipment
Oil and gas properties (successful efforts method)	0			0
Other property and equipment	0			0
Less: accumulated depreciation, depletion, amortization and impairment	0			0
Total property, plant and equipment, net	0			0
Assets held for sale, net	0
Investments in and advances to subsidiaries	4,941,278			4,900,528
Derivative instruments	0			0
Deferred income taxes	243,100			219,670
Long-term inventory	0			0
Operating right-of-use assets	0
Other assets	0			0
Total assets	5,733,780			5,764,132
Current liabilities
Accounts payable	0			0
Accounts payable - affiliates	45,723			43,113
Revenues and production taxes payable	0			0
Accrued liabilities	115			71
Accrued interest payable	20,758			37,096
Derivative instruments	0			0
Advances from joint interest partners	0			0
Current operating lease liabilities	0
Other current liabilities	0
Total current liabilities	66,596			80,280
Long-term debt	1,961,859			1,949,276
Deferred income taxes	0			0
Asset retirement obligations	0			0
Derivative instruments				0
Liabilities held for sale	0
Operating lease liabilities	0
Other liabilities	0			0
Total liabilities	2,028,455			2,029,556
Stockholders’ equity
Oasis share of stockholders’ equity	3,705,325			3,734,576
Non-controlling interests	0			0
Total stockholders’ equity	3,705,325			3,734,576
Total liabilities and stockholders’ equity	5,733,780			5,764,132
Combined Guarantor Subsidiaries
Current assets
Cash and cash equivalents	14,608			15,362
Accounts receivable, net	373,824			385,121
Accounts receivable - affiliates	72,492			76,127
Inventory	35,085			33,106
Prepaid expenses	4,248			9,206
Derivative instruments	52,180			99,930
Intangible assets, net				125
Other current assets	195			183
Total current assets	552,632			619,160
Property, plant and equipment
Oil and gas properties (successful efforts method)	9,393,370			8,923,291
Other property and equipment	249,572			218,617
Less: accumulated depreciation, depletion, amortization and impairment	(3,535,035)			(2,974,122)
Total property, plant and equipment, net	6,107,907			6,167,786
Assets held for sale, net	6,700
Investments in and advances to subsidiaries	372,784			356,039
Derivative instruments	9,729			6,945
Deferred income taxes	0			0
Long-term inventory	14,395			12,260
Operating right-of-use assets	15,310
Other assets	26,291			23,221
Total assets	7,105,748			7,185,411
Current liabilities
Accounts payable	16,319			18,567
Accounts payable - affiliates	626,561			724,187
Revenues and production taxes payable	212,602			216,114
Accrued liabilities	277,797			273,923
Accrued interest payable	298			502
Derivative instruments	830			84
Advances from joint interest partners	3,649			5,140
Current operating lease liabilities	5,077
Other current liabilities	2,773
Total current liabilities	1,145,906			1,238,517
Long-term debt	406,000			468,000
Deferred income taxes	534,315			519,725
Asset retirement obligations	53,906			50,870
Derivative instruments				20
Liabilities held for sale	6,700
Operating lease liabilities	16,116
Other liabilities	1,527			7,751
Total liabilities	2,164,470			2,284,883
Stockholders’ equity
Oasis share of stockholders’ equity	4,941,278			4,900,528
Non-controlling interests	0			0
Total stockholders’ equity	4,941,278			4,900,528
Total liabilities and stockholders’ equity	7,105,748			7,185,411
Combined Non-guarantor
Current assets
Cash and cash equivalents	4,672			6,649
Accounts receivable, net	7,793			2,481
Accounts receivable - affiliates	77,393			80,805
Inventory	1,673			22
Prepaid expenses	964			1,418
Derivative instruments	0			0
Intangible assets, net				0
Other current assets	137			0
Total current assets	92,632			91,375
Property, plant and equipment
Oil and gas properties (successful efforts method)	0			0
Other property and equipment	1,089,696			933,155
Less: accumulated depreciation, depletion, amortization and impairment	(89,129)			(62,730)
Total property, plant and equipment, net	1,000,567			870,425
Assets held for sale, net	0
Investments in and advances to subsidiaries	0			0
Derivative instruments	0			0
Deferred income taxes	0			0
Long-term inventory	0			0
Operating right-of-use assets	5,945
Other assets	3,383			2,452
Total assets	1,102,527			964,252
Current liabilities
Accounts payable	1,684			1,599
Accounts payable - affiliates	26,769			33,014
Revenues and production taxes payable	1,171			581
Accrued liabilities	47,533			57,657
Accrued interest payable	273			442
Derivative instruments	0			0
Advances from joint interest partners	0			0
Current operating lease liabilities	2,973
Other current liabilities	9
Total current liabilities	80,412			93,293
Long-term debt	431,000			318,000
Deferred income taxes	0			0
Asset retirement obligations	1,596			1,514
Derivative instruments				0
Liabilities held for sale	0
Operating lease liabilities	2,979
Other liabilities	557			0
Total liabilities	516,544			412,807
Stockholders’ equity
Oasis share of stockholders’ equity	272,202			238,630
Non-controlling interests	313,781			312,815
Total stockholders’ equity	585,983			551,445
Total liabilities and stockholders’ equity	$ 1,102,527			$ 964,252

Condensed Consolidating Finan_5

Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues
Total revenues	$ 482,743			$ 674,629			$ 1,587,880	$ 1,722,192
Operating expenses
Lease operating expenses	50,313			48,534			164,985	137,456
Marketing, transportation and gathering expenses	32,659			30,713			96,097	74,559
Production taxes	28,461			38,722			86,221	103,748
Depreciation, depletion and amortization	210,832			162,984			578,023	465,819
Exploration expenses	652			22,315			2,369	23,701
Impairment	0			0			653	384,228
General and administrative expenses	52,860			34,859			118,245	91,029
Total operating expenses	473,550			532,453			1,453,473	1,711,659
Loss on sale of properties	(752)			36,869			(3,950)	38,823
Operating income	8,441			179,045			130,457	49,356
Other income (expense)
Equity in earnings (loss) of subsidiaries	0			0			0	0
Net gain (loss) on derivative instruments	47,922			(48,544)			(34,940)	(239,945)
Interest expense, net of capitalized interest	(43,897)			(39,560)			(131,551)	(117,616)
Loss on extinguishment of debt	0			(47)			0	(13,698)
Other income (expense)	473			111			706	146
Total other income (expense), net	4,498			(88,040)			(165,785)	(371,113)
Income (loss) before income taxes	12,939			91,005			(35,328)	(321,757)
Income tax benefit (expense)	17,372			(24,782)			8,835	75,391
Net income (loss) including non-controlling interests	30,311	$ 51,174	$ (107,978)	66,223	$ (316,301)	$ 3,712	(26,493)	(246,366)
Less: Net income attributable to non-controlling interests	10,023			3,882			25,344	10,907
Net income (loss) attributable to Oasis	20,288			62,341			(51,837)	(257,273)
Intercompany Eliminations
Revenues
Total revenues	(52,492)			(41,045)			(146,345)	(113,827)
Operating expenses
Lease operating expenses	(17,054)			(14,565)			(43,529)	(38,957)
Marketing, transportation and gathering expenses	(11,750)			(6,126)			(32,123)	(17,605)
Production taxes	0			0			0	0
Depreciation, depletion and amortization	(5,140)			(4,048)			(15,263)	(11,017)
Exploration expenses	0			0			0	0
Impairment							0	0
General and administrative expenses	(4,232)			(2,703)			(12,948)	(8,940)
Total operating expenses	(49,530)			(39,194)			(138,583)	(107,574)
Loss on sale of properties	0			0			0	0
Operating income	(2,962)			(1,851)			(7,762)	(6,253)
Other income (expense)
Equity in earnings (loss) of subsidiaries	(97,072)			(129,657)			(153,688)	58,606
Net gain (loss) on derivative instruments	0			0			0	0
Interest expense, net of capitalized interest	0			0			0	0
Loss on extinguishment of debt				0				0
Other income (expense)	0			0			0	0
Total other income (expense), net	(97,072)			(129,657)			(153,688)	58,606
Income (loss) before income taxes	(100,034)			(131,508)			(161,450)	52,353
Income tax benefit (expense)	0			0			0	0
Net income (loss) including non-controlling interests	(100,034)			(131,508)			(161,450)	52,353
Less: Net income attributable to non-controlling interests	(13,843)			(22,577)			(43,155)	(62,168)
Net income (loss) attributable to Oasis	(86,191)			(108,931)			(118,295)	114,521
Parent/ Issuer
Revenues
Total revenues	0			0			0	0
Operating expenses
Lease operating expenses	0			0			0	0
Marketing, transportation and gathering expenses	0			0			0	0
Production taxes	0			0			0	0
Depreciation, depletion and amortization	0			0			0	0
Exploration expenses	0			0			0	0
Impairment							0	0
General and administrative expenses	569			7,486			15,964	22,214
Total operating expenses	569			7,486			15,964	22,214
Loss on sale of properties	0			0			0	0
Operating income	(569)			(7,486)			(15,964)	(22,214)
Other income (expense)
Equity in earnings (loss) of subsidiaries	54,755			96,555			39,118	(149,295)
Net gain (loss) on derivative instruments	0			0			0	0
Interest expense, net of capitalized interest	(33,133)			(32,836)			(98,424)	(98,417)
Loss on extinguishment of debt				(47)				(13,698)
Other income (expense)	1			0			2	0
Total other income (expense), net	21,623			63,672			(59,304)	(261,410)
Income (loss) before income taxes	21,054			56,186			(75,268)	(283,624)
Income tax benefit (expense)	(766)			6,155			23,431	26,351
Net income (loss) including non-controlling interests	20,288			62,341			(51,837)	(257,273)
Less: Net income attributable to non-controlling interests	0			0			0	0
Net income (loss) attributable to Oasis	20,288			62,341			(51,837)	(257,273)
Combined Guarantor Subsidiaries
Revenues
Total revenues	434,542			644,207			1,444,237	1,636,573
Operating expenses
Lease operating expenses	67,367			63,099			208,514	176,413
Marketing, transportation and gathering expenses	44,409			36,839			128,220	92,164
Production taxes	28,461			38,722			86,221	103,748
Depreciation, depletion and amortization	206,989			159,843			566,812	456,624
Exploration expenses	652			22,315			2,369	23,701
Impairment							653	384,228
General and administrative expenses	48,944			24,627			91,121	60,259
Total operating expenses	481,632			531,707			1,446,253	1,706,045
Loss on sale of properties	(752)			36,869			(3,950)	38,823
Operating income	(47,842)			149,369			(5,966)	(30,649)
Other income (expense)
Equity in earnings (loss) of subsidiaries	42,317			33,102			114,570	90,689
Net gain (loss) on derivative instruments	47,922			(48,544)			(34,940)	(239,945)
Interest expense, net of capitalized interest	(6,252)			(6,561)			(20,658)	(18,591)
Loss on extinguishment of debt				0				0
Other income (expense)	472			126			708	161
Total other income (expense), net	84,459			(21,877)			59,680	(167,686)
Income (loss) before income taxes	36,617			127,492			53,714	(198,335)
Income tax benefit (expense)	18,138			(30,937)			(14,596)	49,040
Net income (loss) including non-controlling interests	54,755			96,555			39,118	(149,295)
Less: Net income attributable to non-controlling interests	0			0			0	0
Net income (loss) attributable to Oasis	54,755			96,555			39,118	(149,295)
Combined Non-guarantor
Revenues
Total revenues	100,693			71,467			289,988	199,446
Operating expenses
Lease operating expenses	0			0			0	0
Marketing, transportation and gathering expenses	0			0			0	0
Production taxes	0			0			0	0
Depreciation, depletion and amortization	8,983			7,189			26,474	20,212
Exploration expenses	0			0			0	0
Impairment							0	0
General and administrative expenses	7,579			5,449			24,108	17,496
Total operating expenses	40,879			32,454			129,839	90,974
Loss on sale of properties	0			0			0	0
Operating income	59,814			39,013			160,149	108,472
Other income (expense)
Equity in earnings (loss) of subsidiaries	0			0			0	0
Net gain (loss) on derivative instruments	0			0			0	0
Interest expense, net of capitalized interest	(4,512)			(163)			(12,469)	(608)
Loss on extinguishment of debt				0				0
Other income (expense)	0			(15)			(4)	(15)
Total other income (expense), net	(4,512)			(178)			(12,473)	(623)
Income (loss) before income taxes	55,302			38,835			147,676	107,849
Income tax benefit (expense)	0			0			0	0
Net income (loss) including non-controlling interests	55,302			38,835			147,676	107,849
Less: Net income attributable to non-controlling interests	23,866			26,459			68,499	73,075
Net income (loss) attributable to Oasis	31,436			12,376			79,177	34,774
Oil and gas revenues
Revenues
Total revenues	344,470			454,195			1,070,256	1,218,639
Oil and gas revenues | Intercompany Eliminations
Revenues
Total revenues	368			0			368	0
Oil and gas revenues | Parent/ Issuer
Revenues
Total revenues	0			0			0	0
Oil and gas revenues | Combined Guarantor Subsidiaries
Revenues
Total revenues	344,102			454,195			1,069,888	1,218,639
Oil and gas revenues | Combined Non-guarantor
Revenues
Total revenues	0			0			0	0
Purchased oil and gas
Revenues
Total revenues	79,352			172,985			337,212	368,758
Operating expenses
Expenses	78,655			174,269			338,221	374,442
Purchased oil and gas | Intercompany Eliminations
Revenues
Total revenues	0			0			0	0
Operating expenses
Expenses	0			(60)			0	(60)
Purchased oil and gas | Parent/ Issuer
Revenues
Total revenues	0			0			0	0
Operating expenses
Expenses	0			0			0	0
Purchased oil and gas | Combined Guarantor Subsidiaries
Revenues
Total revenues	79,352			172,985			337,212	368,758
Operating expenses
Expenses	78,655			174,329			338,221	374,502
Purchased oil and gas | Combined Non-guarantor
Revenues
Total revenues	0			0			0	0
Operating expenses
Expenses	0			0			0	0
Midstream Services
Revenues
Total revenues	50,023			31,187			149,617	88,451
Operating expenses
Expenses	12,967			8,652			47,064	24,325
Midstream Services | Intercompany Eliminations
Revenues
Total revenues	(52,860)			(41,045)			(146,713)	(113,827)
Operating expenses
Expenses	(11,354)			(11,692)			(34,720)	(30,995)
Midstream Services | Parent/ Issuer
Revenues
Total revenues	0			0			0	0
Operating expenses
Expenses	0			0			0	0
Midstream Services | Combined Guarantor Subsidiaries
Revenues
Total revenues	2,190			765			6,342	2,832
Operating expenses
Expenses	4			528			2,527	2,054
Midstream Services | Combined Non-guarantor
Revenues
Total revenues	100,693			71,467			289,988	199,446
Operating expenses
Expenses	24,317			19,816			79,257	53,266
Well Services
Revenues
Total revenues	8,898			16,262			30,795	46,344
Operating expenses
Expenses	6,151			11,405			21,595	32,352
Well Services | Intercompany Eliminations
Revenues
Total revenues	0			0			0	0
Operating expenses
Expenses	0			0			0	0
Well Services | Parent/ Issuer
Revenues
Total revenues	0			0			0	0
Operating expenses
Expenses	0			0			0	0
Well Services | Combined Guarantor Subsidiaries
Revenues
Total revenues	8,898			16,262			30,795	46,344
Operating expenses
Expenses	6,151			11,405			21,595	32,352
Well Services | Combined Non-guarantor
Revenues
Total revenues	0			0			0	0
Operating expenses
Expenses	$ 0			$ 0			$ 0	$ 0

Condensed Consolidating Finan_6

Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Statement of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net loss including non-controlling interests	$ 30,311	$ 51,174	$ (107,978)	$ 66,223	$ (316,301)	$ 3,712	$ (26,493)	$ (246,366)
Adjustments to reconcile net income (loss) including non-controlling interests to net cash provided by (used in) operating activities:
Equity in earnings (loss) of subsidiaries	0			0			0	0
Depreciation, depletion and amortization	210,832			162,984			578,023	465,819
Loss on extinguishment of debt	0			47			0	13,698
(Gain) loss on sale of properties	752			(36,869)			3,950	(38,823)
Impairment	0			0			653	384,228
Deferred income taxes							(8,840)	(75,418)
Derivative instruments	(47,922)			48,544			34,940	239,945
Equity-based compensation expenses							26,370	21,586
Deferred financing costs amortization and other							18,190	20,074
Working capital and other changes:
Change in accounts receivable, net							1,555	(61,275)
Change in inventory							(3,676)	(12,076)
Change in prepaid expenses							4,153	1,196
Change in accounts payable, interest payable and accrued liabilities							22,280	50,308
Change in other assets and liabilities, net							(11,211)	(895)
Net cash provided by operating activities							639,894	762,001
Cash flows from investing activities:
Capital expenditures							(714,270)	(841,088)
Acquisitions							(8,337)	(579,886)
Proceeds from sale of properties							41,039	333,029
Derivative settlements							10,752
Costs related to sale of properties							0	(2,707)
Derivative settlements								(162,013)
Other							0	(1,038)
Net cash used in investing activities							(670,816)	(1,253,703)
Cash flows from financing activities:
Proceeds from Revolving Credit Facilities							1,651,000	2,499,000
Principal payments on revolving credit facility							(1,600,000)	(1,959,000)
Repurchase of senior unsecured notes							0	(423,190)
Proceeds from issuance of senior unsecured notes							0	400,000
Deferred financing costs							(852)	(7,650)
Purchases of treasury stock							(4,625)	(6,806)
Distributions to non-controlling interests							(15,551)	(10,393)
Investment in subsidiaries / capital contributions from parent							0	0
Payments on finance lease liabilities							(1,423)	0
Other							(392)	(87)
Net cash provided by financing activities							28,157	491,874
Increase (decrease) in cash and cash equivalents							(2,765)	172
Beginning of period			22,190			16,720	22,190	16,720
End of period	19,425			16,892			19,425	16,892
Intercompany Eliminations
Cash flows from operating activities:
Net loss including non-controlling interests	(100,034)			(131,508)			(161,450)	52,353
Adjustments to reconcile net income (loss) including non-controlling interests to net cash provided by (used in) operating activities:
Equity in earnings (loss) of subsidiaries	97,072			129,657			153,688	(58,606)
Depreciation, depletion and amortization	(5,140)			(4,048)			(15,263)	(11,017)
Loss on extinguishment of debt				0				0
(Gain) loss on sale of properties	0			0			0	0
Impairment							0	0
Deferred income taxes							0	0
Derivative instruments	0			0			0	0
Equity-based compensation expenses							0	0
Deferred financing costs amortization and other							0	0
Working capital and other changes:
Change in accounts receivable, net							(101,262)	234,798
Change in inventory							0	0
Change in prepaid expenses							0	0
Change in accounts payable, interest payable and accrued liabilities							101,262	(234,798)
Change in other assets and liabilities, net							0	0
Net cash provided by operating activities							(23,025)	(17,270)
Cash flows from investing activities:
Capital expenditures							0	0
Acquisitions							0	0
Proceeds from sale of properties							0	0
Derivative settlements							0
Costs related to sale of properties								0
Derivative settlements								0
Other								0
Net cash used in investing activities							0	0
Cash flows from financing activities:
Proceeds from Revolving Credit Facilities							0	0
Principal payments on revolving credit facility							0	0
Repurchase of senior unsecured notes								0
Proceeds from issuance of senior unsecured notes								0
Deferred financing costs							0	0
Purchases of treasury stock							0	0
Distributions to non-controlling interests							54,116	92,672
Investment in subsidiaries / capital contributions from parent							(31,091)	(75,402)
Payments on finance lease liabilities							0
Other							0	0
Net cash provided by financing activities							23,025	17,270
Increase (decrease) in cash and cash equivalents							0	0
Beginning of period			0			0	0	0
End of period	0			0			0	0
Parent/ Issuer
Cash flows from operating activities:
Net loss including non-controlling interests	20,288			62,341			(51,837)	(257,273)
Adjustments to reconcile net income (loss) including non-controlling interests to net cash provided by (used in) operating activities:
Equity in earnings (loss) of subsidiaries	(54,755)			(96,555)			(39,118)	149,295
Depreciation, depletion and amortization	0			0			0	0
Loss on extinguishment of debt				47				13,698
(Gain) loss on sale of properties	0			0			0	0
Impairment							0	0
Deferred income taxes							(23,431)	(26,351)
Derivative instruments	0			0			0	0
Equity-based compensation expenses							13,933	20,292
Deferred financing costs amortization and other							12,582	11,955
Working capital and other changes:
Change in accounts receivable, net							94,214	(227,589)
Change in inventory							0	0
Change in prepaid expenses							283	(350)
Change in accounts payable, interest payable and accrued liabilities							(13,684)	(12,270)
Change in other assets and liabilities, net							0	0
Net cash provided by operating activities							(7,058)	(328,593)
Cash flows from investing activities:
Capital expenditures							0	0
Acquisitions							0	0
Proceeds from sale of properties							0	0
Derivative settlements							0
Costs related to sale of properties								0
Derivative settlements								0
Other								0
Net cash used in investing activities							0	0
Cash flows from financing activities:
Proceeds from Revolving Credit Facilities							0	0
Principal payments on revolving credit facility							0	0
Repurchase of senior unsecured notes								(423,190)
Proceeds from issuance of senior unsecured notes								400,000
Deferred financing costs							0	(7,058)
Purchases of treasury stock							(4,625)	(6,806)
Distributions to non-controlling interests							0	0
Investment in subsidiaries / capital contributions from parent							11,649	365,601
Payments on finance lease liabilities							0
Other							0	38
Net cash provided by financing activities							7,024	328,585
Increase (decrease) in cash and cash equivalents							(34)	(8)
Beginning of period			179			178	179	178
End of period	145			170			145	170
Combined Guarantor Subsidiaries
Cash flows from operating activities:
Net loss including non-controlling interests	54,755			96,555			39,118	(149,295)
Adjustments to reconcile net income (loss) including non-controlling interests to net cash provided by (used in) operating activities:
Equity in earnings (loss) of subsidiaries	(42,317)			(33,102)			(114,570)	(90,689)
Depreciation, depletion and amortization	206,989			159,843			566,812	456,624
Loss on extinguishment of debt				0				0
(Gain) loss on sale of properties	752			(36,869)			3,950	(38,823)
Impairment							653	384,228
Deferred income taxes							14,591	(49,067)
Derivative instruments	(47,922)			48,544			34,940	239,945
Equity-based compensation expenses							12,134	1,014
Deferred financing costs amortization and other							4,948	7,884
Working capital and other changes:
Change in accounts receivable, net							9,858	(77,231)
Change in inventory							(3,676)	(12,076)
Change in prepaid expenses							3,416	864
Change in accounts payable, interest payable and accrued liabilities							(63,125)	278,481
Change in other assets and liabilities, net							(9,258)	(895)
Net cash provided by operating activities							499,791	950,964
Cash flows from investing activities:
Capital expenditures							(543,420)	(621,269)
Acquisitions							(8,337)	(579,886)
Proceeds from sale of properties							41,039	333,029
Derivative settlements							10,752
Costs related to sale of properties								(2,707)
Derivative settlements								(162,013)
Other								(1,038)
Net cash used in investing activities							(499,966)	(1,033,884)
Cash flows from financing activities:
Proceeds from Revolving Credit Facilities							1,533,000	2,376,000
Principal payments on revolving credit facility							(1,595,000)	(1,924,000)
Repurchase of senior unsecured notes								0
Proceeds from issuance of senior unsecured notes								0
Deferred financing costs							(41)	(261)
Purchases of treasury stock							0	0
Distributions to non-controlling interests							0	0
Investment in subsidiaries / capital contributions from parent							62,824	(372,621)
Payments on finance lease liabilities							(1,364)
Other							2	(125)
Net cash provided by financing activities							(579)	78,993
Increase (decrease) in cash and cash equivalents							(754)	(3,927)
Beginning of period			15,362			15,659	15,362	15,659
End of period	14,608			11,732			14,608	11,732
Combined Non-guarantor
Cash flows from operating activities:
Net loss including non-controlling interests	55,302			38,835			147,676	107,849
Adjustments to reconcile net income (loss) including non-controlling interests to net cash provided by (used in) operating activities:
Equity in earnings (loss) of subsidiaries	0			0			0	0
Depreciation, depletion and amortization	8,983			7,189			26,474	20,212
Loss on extinguishment of debt				0				0
(Gain) loss on sale of properties	0			0			0	0
Impairment							0	0
Deferred income taxes							0	0
Derivative instruments	0			0			0	0
Equity-based compensation expenses							303	280
Deferred financing costs amortization and other							660	235
Working capital and other changes:
Change in accounts receivable, net							(1,255)	8,747
Change in inventory							0	0
Change in prepaid expenses							454	682
Change in accounts payable, interest payable and accrued liabilities							(2,173)	18,895
Change in other assets and liabilities, net							(1,953)	0
Net cash provided by operating activities							170,186	156,900
Cash flows from investing activities:
Capital expenditures							(170,850)	(219,819)
Acquisitions							0	0
Proceeds from sale of properties							0	0
Derivative settlements							0
Costs related to sale of properties								0
Derivative settlements								0
Other								0
Net cash used in investing activities							(170,850)	(219,819)
Cash flows from financing activities:
Proceeds from Revolving Credit Facilities							118,000	123,000
Principal payments on revolving credit facility							(5,000)	(35,000)
Repurchase of senior unsecured notes								0
Proceeds from issuance of senior unsecured notes								0
Deferred financing costs							(811)	(331)
Purchases of treasury stock							0	0
Distributions to non-controlling interests							(69,667)	(103,065)
Investment in subsidiaries / capital contributions from parent							(43,382)	82,422
Payments on finance lease liabilities							(59)
Other							(394)	0
Net cash provided by financing activities							(1,313)	67,026
Increase (decrease) in cash and cash equivalents							(1,977)	4,107
Beginning of period			$ 6,649			$ 883	6,649	883
End of period	$ 4,672			$ 4,990			$ 4,672	$ 4,990