Chord Energy (CHRD) 10-Q 8 May 19 2019 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	Apr. 30, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Trading Symbol	OAS
Entity Registrant Name	Oasis Petroleum Inc.
Entity Central Index Key	0001486159
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		322,031,546

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 15,442	$ 22,190
Accounts receivable, net	456,639	387,602
Inventory	36,269	33,128
Prepaid expenses	8,404	10,997
Derivative instruments	4,467	99,930
Intangible assets, net	0	125
Other current assets	309	183
Total current assets	521,530	554,155
Property, plant and equipment
Oil and gas properties (successful efforts method)	9,073,085	8,912,189
Other property and equipment	1,216,763	1,151,772
Less: accumulated depreciation, depletion, amortization and impairment	(3,233,106)	(3,036,852)
Total property, plant and equipment, net	7,056,742	7,027,109
Derivative instruments	181	6,945
Long-term inventory	13,767	12,260
Operating right-of-use assets	24,741
Other assets	29,385	25,673
Total assets	7,646,346	7,626,142
Current liabilities
Accounts payable	10,172	20,166
Revenues and production taxes payable	249,569	216,695
Accrued liabilities	338,819	331,651
Accrued interest payable	21,931	38,040
Derivative instruments	27,663	84
Advances from joint interest partners	5,072	5,140
Current operating lease liabilities	13,135
Other current liabilities	2,485	0
Total current liabilities	668,846	611,776
Long-term debt	2,791,333	2,735,276
Deferred income taxes	296,508	300,055
Asset retirement obligations	53,404	52,384
Derivative instruments	1,271	20
Operating lease liabilities	17,610
Other liabilities	6,239	7,751
Total liabilities	3,835,211	3,707,262
Commitments and contingencies
Stockholders’ equity
Common stock, $0.01 par value: 900,000,000 shares authorized; 324,829,258 shares issued and 322,051,268 shares outstanding at March 31, 2019 and 320,469,049 shares issued and 318,377,161 shares outstanding at December 31, 2018	3,182	3,157
Treasury stock, at cost: 2,777,990 and 2,091,888 shares at March 31, 2019 and December 31, 2018, respectively	(33,286)	(29,025)
Additional paid-in capital	3,087,083	3,077,755
Retained earnings	567,807	682,689
Oasis share of stockholders’ equity	3,624,786	3,734,576
Non-controlling interests	186,349	184,304
Total stockholders’ equity	3,811,135	3,918,880
Total liabilities and stockholders’ equity	$ 7,646,346	$ 7,626,142

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Mar. 31, 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)	324,829,258	320,469,049
Common stock, shares outstanding (in shares)	322,051,268	318,377,161
Treasury stock, shares (in shares)	2,777,990	2,091,888

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues
Total revenues	$ 575,732	$ 473,812
Operating expenses
Lease operating expenses	58,444	44,781
Marketing, transportation and gathering expenses	34,950	21,013
Production taxes	29,618	31,000
Depreciation, depletion and amortization	189,833	149,265
Exploration expenses	830	769
Impairment	629	93
General and administrative expenses	34,459	27,940
Total operating expenses	522,366	360,827
Loss on sale of properties	(2,922)	0
Operating income	50,444	112,985
Other income (expense)
Net loss on derivative instruments	(117,611)	(71,116)
Interest expense, net of capitalized interest	(44,468)	(37,146)
Other expense	(46)	(183)
Total other expense	(162,125)	(108,445)
Income (loss) before income taxes	(111,681)	4,540
Income tax benefit (expense)	3,703	(828)
Net income (loss) including non-controlling interests	(107,978)	3,712
Less: Net income attributable to non-controlling interests	6,904	3,122
Net income (loss) attributable to Oasis	$ (114,882)	$ 590
Earnings (loss) attributable to Oasis per share:
Basic (in dollars per share)	$ (0.37)	$ 0
Diluted (in dollars per share)	$ (0.37)	$ 0
Weighted average shares outstanding:
Basic (in shares)	314,464	290,105
Diluted (in shares)	314,464	291,738
Oil and gas revenues
Revenues
Total revenues	$ 368,782	$ 366,595
Purchased oil and gas
Revenues
Total revenues	148,471	67,709
Operating expenses
Expenses	149,904	70,594
Midstream Services
Revenues
Total revenues	48,021	27,922
Operating expenses
Expenses	16,729	7,985
Well Services
Revenues
Total revenues	10,458	11,586
Operating expenses
Expenses	$ 6,970	$ 7,387

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
Other (Oasis Midstream common units)	(90)			(90)
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)
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, 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]
Other (Oasis Midstream common units)	(175)			(134)		(41)
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
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

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income (loss) including non-controlling interests	$ (107,978)	$ 3,712
Adjustments to reconcile net income (loss) including non-controlling interests to net cash provided by operating activities:
Depreciation, depletion and amortization	189,833	149,265
Loss on sale of properties	2,922	0
Impairment	629	93
Deferred income taxes	(3,547)	828
Derivative instruments	117,611	71,116
Equity-based compensation expenses	9,013	6,754
Deferred financing costs amortization and other	6,930	5,475
Working capital and other changes:
Change in accounts receivable, net	(71,083)	(5,708)
Change in inventory	(3,184)	(3,672)
Change in prepaid expenses	1,505	492
Change in accounts payable, interest payable and accrued liabilities	36,666	(244)
Change in other assets and liabilities, net	(4,391)	248
Net cash provided by operating activities	174,926	228,359
Cash flows from investing activities:
Capital expenditures	(237,448)	(254,838)
Acquisitions	0	(520,728)
Derivative settlements	13,446
Derivative settlements		(36,974)
Other	0	(28)
Net cash used in investing activities	(224,002)	(812,568)
Cash flows from financing activities:
Proceeds from Revolving Credit Facilities	420,000	1,470,000
Principal payments on Revolving Credit Facilities	(368,000)	(875,000)
Deferred financing costs	(43)	(215)
Purchases of treasury stock	(4,261)	(6,021)
Distributions to non-controlling interests	(4,937)	(3,450)
Other	(431)	(90)
Net cash provided by financing activities	42,328	585,224
Increase (decrease) in cash and cash equivalents	(6,748)	1,015
Cash and cash equivalents:
Beginning of period	22,190	16,720
End of period	15,442	17,735
Supplemental non-cash transactions:
Change in accrued capital expenditures	(23,686)	12,855
Change in asset retirement obligations	2,016	3,453
Issuance of shares in connection with acquisition	$ 0	$ 371,220

Organization and Operations of

Organization and Operations of the Company	3 Months Ended
	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Operations of the Company	Organization and Operations of the Company Oasis 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 S tates. Oasis Petroleum North America LLC (“OPNA”) and Oasis Petroleum Permian LLC (“ OP Permian ”) conduct the Company’s exploration and production activities and own its proved and unproved crude oil and natural gas properties located in the North Dakota and Montana regions of the Williston Basin and the Texas region of the Delaware Basin, respectively. The Company also operates a midstream services business through OMS Holdings LLC (“ OMS ”), through which the Company owns the general partner and a majority of the outstanding units of Oasis Midstream Partners LP (“ OMP ” or “ Oasis Midstream ”). The Company also operates a well services business through Oasis Well Services LLC (“OWS”). OMS and OWS are separate reportable business segments that are complementary to the Company’s primary development and production activities.

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 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 . 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 LLC (“ OMP GP ”), the general partner to OMP , OMP is a variable interest entity (“ VIE ”). 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 as of March 31, 2019 . 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 months ended March 31, 2018 by revising the unaudited condensed consolidated financial statements appearing herein. Periods not presented herein will be revised, as applicable, in future filings. For the three months ended March 31, 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 March 31, 2018 As Reported Revision As Revised (In thousands, except per share data) Oil and gas revenues $ 363,671 $ 2,924 $ 366,595 Purchased oil and gas sales 18,037 49,672 67,709 Total revenues 421,216 52,596 473,812 Purchased oil and gas expenses 17,998 52,596 70,594 Total operating expenses 308,231 52,596 360,827 Net income attributable to Oasis 590 — 590 Earnings attributable to Oasis per share: Basic $ 0.00 $ — $ 0.00 Diluted $ 0.00 $ — $ 0.00 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 FASB issued Accounting Standards Update No. 2016-02, Leases (Topic 842) (“ASU 2016-02”), 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 short-term leases, or 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. 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 LP

Oasis Midstream Partners LP	3 Months Ended
	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Oasis Midstream Partners LP	Oasis Midstream Partners LP 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 months ended March 31, 2019 , OMP made capital contributions to Bobcat DevCo pursuant to the 2019 Capital Expenditures Arrangement of $17.1 million , and OMS’s ownership interest in Bobcat DevCo decreased from 75% as of December 31, 2018 to 72.6% as of March 31, 2019 .

Revenue Recognition

Revenue Recognition	3 Months Ended
	Mar. 31, 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 months ended March 31, 2019 and 2018 : Exploration and Production Revenues Three Months Ended March 31, 2019 2018 (In thousands) Crude oil revenues $ 318,120 $ 326,310 Purchased crude oil sales 147,136 67,660 Natural gas revenues 27,452 26,962 Purchased natural gas sales 1,335 49 NGL revenues 23,210 13,323 Total exploration and production revenues $ 517,253 $ 434,304 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 months ended March 31, 2019 and 2018 : Midstream Revenues (1) Three Months Ended March 31, 2019 2018 (In thousands) Midstream service revenues Crude oil and natural gas revenues $ 24,664 $ 18,029 Produced and flowback water revenues 9,033 8,876 Total midstream service revenues $ 33,697 $ 26,905 Midstream product revenues Natural gas and NGL revenues $ 12,797 $ — Freshwater revenues 1,527 1,017 Total midstream product revenues $ 14,324 $ 1,017 Total midstream revenues $ 48,021 $ 27,922 __________________ (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 months ended March 31, 2019 and 2018 : Well Services Revenues (1) Three Months Ended March 31, 2019 2018 (In thousands) Hydraulic fracturing revenues $ 9,775 $ 10,426 Equipment rental revenues 683 1,160 Total well services revenues $ 10,458 $ 11,586 __________________ (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 30 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 months ended March 31, 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 related to temporary deficiency quantities under minimum volume commitments, which are expected to be made up in a future period. This consideration is subsequently recognized as revenue when the customer makes up the volumes or the deficiency makeup period expires. 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 contract balances were recorded in the condensed consolidated financial statements at March 31, 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 March 31, 2019 : (In thousands) 2019 (excluding the three months ended March 31, 2019) $ 20,430 2020 26,905 2021 25,656 2022 19,263 2023 12,642 Thereafter 14,642 Total $ 119,538 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. The Company has elected practical expedients, pursuant to ASC 606, to exclude from the presentation of remaining performance obligations: (i) contracts with index-based pricing or variable volume attributes in which such variable consideration is allocated entirely to a wholly unsatisfied performance obligation or to a wholly unsatisfied promise to transfer a distinct service that forms part of a series of distinct services; (ii) contracts with an original expected duration of one year or less; and (iii) contracts for which the Company recognizes revenue under the right to invoice practical expedient.

Inventory

Inventory	3 Months Ended
	Mar. 31, 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. T he 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: March 31, 2019 December 31, 2018 (In thousands) Inventory Crude oil inventory $ 17,542 $ 14,933 Equipment and materials 18,727 18,195 Total inventory $ 36,269 $ 33,128 Long-term inventory Linefill in third party pipelines $ 13,767 $ 12,260 Total long-term inventory $ 13,767 $ 12,260 Total $ 50,036 $ 45,388

Accounts Receivable, Net

Accounts Receivable, Net	3 Months Ended
	Mar. 31, 2019
Receivables [Abstract]
Accounts Receivable, Net	Accounts Receivable, Net The following table sets forth the Company’s accounts receivable, net: March 31, 2019 December 31, 2018 (In thousands) Trade accounts $ 332,889 $ 245,546 Joint interest accounts 114,502 133,375 Other accounts 10,774 10,207 Total 458,165 389,128 Allowance for doubtful accounts (1,526 ) (1,526 ) Total accounts receivable, net $ 456,639 $ 387,602

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 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 March 31, 2019 Level 1 Level 2 Level 3 Total (In thousands) Assets: Money market funds $ 144 $ — $ — $ 144 Commodity derivative instruments (see Note 8) — 4,648 — 4,648 Total assets $ 144 $ 4,648 $ — $ 4,792 Liabilities: Commodity derivative instruments (see Note 8) $ — $ 28,934 $ — $ 28,934 Total liabilities $ — $ 28,934 $ — $ 28,934 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 March 31, 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 liability by $0.5 million at March 31, 2019 and an adjustment to reduce the fair value of its net derivative asset by $0.2 million at December 31, 2018 . There were no transfers between fair value levels during the three months ended March 31, 2019 .

Derivative Instruments

Derivative Instruments	3 Months Ended
	Mar. 31, 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 ”), the average Intercontinental Exchange, Inc. Brent crude oil index price (“ ICE Brent ”), the average Argus WTI Midland crude oil index price (“ Midland ”) 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 ”) and the average Inside FERC Northern Natural Gas Ventura natural gas index price (“ IF NNG Ventura ”). At March 31, 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 March 31, 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 3,881,000 Bbl $ 54.02 $ (23,216 ) Crude oil 2019 Basis swaps ICE Brent-NYMEX WTI 244,000 Bbl $ 9.68 549 Crude oil 2019 Basis swaps Midland-NYMEX WTI 488,000 Bbl $ (6.71 ) (2,971 ) Crude oil 2019 Basis swaps Houston-NYMEX WTI 549,000 Bbl $ 4.55 (305 ) Crude oil 2019 Two-way collar NYMEX WTI 3,542,000 Bbl $ 57.65 $ 74.72 5,381 Crude oil 2019 Three-way collar NYMEX WTI 3,300,000 Bbl $ 40.37 $ 51.43 $ 66.81 (2,375 ) Crude oil 2020 Fixed price swaps NYMEX WTI 829,000 Bbl $ 56.60 (2,363 ) Crude oil 2020 Two-way collar NYMEX WTI 372,000 Bbl $ 58.08 $ 76.05 1,270 Crude oil 2020 Three-way collar NYMEX WTI 1,712,000 Bbl $ 40.00 $ 55.39 $ 61.13 (2,081 ) Crude oil 2021 Three-way collar NYMEX WTI 124,000 Bbl $ 40.00 $ 56.18 $ 60.43 (59 ) Natural gas 2019 Fixed price swaps NYMEX HH 8,796,000 MMBtu $ 2.92 1,148 Natural gas 2019 Basis swaps IF NNG Ventura-NYMEX HH 2,275,000 MMBtu $ 0.02 736 $ (24,286 ) Subsequent to March 31, 2019 , the Company entered into additional fixed price swaps, basis swaps and two-way and three-way costless collars. As of May 8, 2019 , the Company had the following outstanding commodity derivative contracts: Commodity Settlement Derivative Index Volumes Weighted Average Prices Fixed Price Swaps Basis Swaps Sub-Floor Floor Ceiling Crude oil 2019 Fixed price swaps NYMEX WTI 4,952,000 Bbl $ 56.15 Crude oil 2019 Basis swaps ICE Brent-NYMEX WTI 244,000 Bbl $ 9.68 Crude oil 2019 Basis swaps Midland-NYMEX WTI 488,000 Bbl $ (6.71 ) Crude oil 2019 Basis swaps Houston-NYMEX WTI 549,000 Bbl $ 4.55 Crude oil 2019 Two-way collar NYMEX WTI 3,848,000 Bbl $ 57.68 $ 74.04 Crude oil 2019 Three-way collar NYMEX WTI 3,300,000 Bbl $ 40.37 $ 51.43 $ 66.81 Crude oil 2020 Fixed price swaps NYMEX WTI 2,171,000 Bbl $ 59.09 Crude oil 2020 Two-way collar NYMEX WTI 434,000 Bbl $ 58.07 $ 74.64 Crude oil 2020 Three-way collar NYMEX WTI 3,110,000 Bbl $ 40.00 $ 54.79 $ 63.75 Crude oil 2021 Fixed price swaps NYMEX WTI 93,000 Bbl $ 58.85 Crude oil 2021 Three-way collar NYMEX WTI 186,000 Bbl $ 40.00 $ 54.96 $ 62.31 Natural gas 2019 Fixed price swaps NYMEX HH 8,796,000 MMBtu $ 2.92 Natural gas 2019 Basis swaps IF NNG Ventura-NYMEX HH 2,275,000 MMBtu $ 0.02 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 March 31, Statements of Operations Location 2019 2018 (In thousands) Net loss on derivative instruments $ (117,611 ) $ (71,116 ) 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: March 31, 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 $ 6,734 $ (2,267 ) $ 4,467 Commodity contracts Derivative instruments — non-current assets 2,504 (2,323 ) 181 Total derivatives assets $ 9,238 $ (4,590 ) $ 4,648 Derivatives liabilities: Commodity contracts Derivative instruments — current liabilities $ 36,599 $ (8,936 ) $ 27,663 Commodity contracts Derivative instruments — non-current liabilities 1,875 (604 ) 1,271 Total derivatives liabilities $ 38,474 $ (9,540 ) $ 28,934 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	3 Months Ended
	Mar. 31, 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: March 31, 2019 December 31, 2018 (In thousands) Proved oil and gas properties (1) $ 8,039,585 $ 7,878,104 Less: Accumulated depreciation, depletion, amortization and impairment (3,035,748 ) (2,853,353 ) Proved oil and gas properties, net 5,003,837 5,024,751 Unproved oil and gas properties 1,033,500 1,034,085 Other property and equipment (2) 1,216,763 1,151,772 Less: Accumulated depreciation (197,358 ) (183,499 ) Other property and equipment, net 1,019,405 968,273 Total property, plant and equipment, net $ 7,056,742 $ 7,027,109 __________________ (1) Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $41.6 million and $40.5 million at March 31, 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 March 31, 2019 and December 31, 2018 , respectively.

Divestitures

Divestitures	3 Months Ended
	Mar. 31, 2019
Discontinued Operations and Disposal Groups [Abstract]
Divestitures	Divestitures During the three months ended March 31, 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 $2.9 million net loss on sale of properties, which includes customary closing adjustments, in its Condensed Consolidated Statements of Operations for the three months ended March 31, 2019 .

Long-Term Debt

Long-Term Debt	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt The Company’s long-term debt consists of the following: March 31, 2019 December 31, 2018 (In thousands) Oasis Credit Facility $ 493,000 $ 468,000 OMP Credit Facility 345,000 318,000 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 (19,692 ) (20,865 ) Less: unamortized debt discount on senior unsecured convertible notes (66,384 ) (69,268 ) Total long-term debt $ 2,791,333 $ 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 March 31, 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 . All other significant rates, terms and conditions of the Oasis Credit Facility remained the same. The next redetermination of the Oasis Credit Facility ’s borrowing base is scheduled for October 1, 2019 . At March 31, 2019 , the Company had $493.0 million of London Interbank Offered Rate (“LIBOR”) loans at a weighted average interest rate of 4.2% and $14.0 million of outstanding letters of credit issued under the Oasis Credit Facility , resulting in an unused borrowing base committed capacity of $843.0 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 March 31, 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 has a revolving line of credit of $400.0 million as of March 31, 2019 and a maturity date of September 25, 2022. The OMP Credit Facility is available to fund working capital and to finance acquisitions and other capital expenditures of OMP. The OMP Credit Facility includes a letter of credit sublimit of $10.0 million and a swingline loans sublimit of $10.0 million . The borrowing capacity on the OMP Credit Facility may be increased up to $600.0 million , subject to certain conditions. At March 31, 2019 , the Company had $345.0 million of borrowings outstanding under the OMP Credit Facility at a weighted average interest rate of 4.2% , resulting in an unused borrowing base capacity of $55.0 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 March 31, 2019 . 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. 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 March 31, 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 March 31, 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 March 31, 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 March 31, 2019 . Interest on the Senior Notes and the Senior Convertible Notes (collectively, the “Notes”) is payable semi-annually in arrears. The fair value of the Notes, which are publicly traded and therefore categorized as Level 1 liabilities, was $2,008.6 million at March 31, 2019 . The Notes are guaranteed on a senior unsecured basis by the Company, along with its material subsidiaries (the “Guarantors”), which are 100% owned by the Company. These guarantees are full and unconditional and joint and several among the Guarantors, subject to certain customary release provisions. The indentures governing the Notes contain customary events of default.

Asset Retirement Obligations

Asset Retirement Obligations	3 Months Ended
	Mar. 31, 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 three months ended March 31, 2019 : (In thousands) Balance at December 31, 2018 $ 52,449 Liabilities incurred during period 405 Liabilities settled during period (72 ) Accretion expense during period (1) 718 Revisions to estimates 827 Balance at March 31, 2019 $ 54,327 ___________________ (1) Included in depreciation, depletion and amortization on the Company’s Condensed Consolidated Statements of Operations. At March 31, 2019 , the current portion of the total ARO balance was approximately $0.9 million and was included in accrued liabilities on the Company’s Condensed Consolidated Balance Sheets.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company’s effective tax rate for the three months ended March 31, 2019 wa s 3.3% on pre-tax loss of $111.7 million , as compared to an effective tax rate of 18.2% for the three months ended March 31, 2018 on pre-tax income of $4.5 million . The effective tax rate for the three months ended March 31, 2019 was lower than the statutory federal rate of 21% primarily due to income attributable to non-controlling interests as compared to forecasted pre-tax book income and the impact of equity-based compensation shortfalls. These decreases were partially offset by state income taxes and the impact of other permanent differences, primarily non-deductible executive compensation. The effective tax rate for the three months ended March 31, 2018 was lower than the statutory federal rate of 21% primarily due to the tax impact of a decrease in the Company’s deferred state tax rate and income attributable to non-controlling interests, which are not taxable to the Company. These decreases are partially offset by state income taxes, an increase in the valuation allowance recorded against the Company’s Montana net operating loss carryforwards and the impact of equity-based compensation shortfalls.

Equity-Based Compensation

Equity-Based Compensation	3 Months Ended
	Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity-Based Compensation	Equity-Based Compensation Restricted stock awa rds. 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 -year period. The fair value of restricted stock awards is based on the closing sales price of the Company’s common stock on the date of grant. Compensation expense is recognized ratably over the requisite service period. During the three months ended March 31, 2019 , employees and non-employee directors of the Company were granted restricted stock awards equal to 4,030,475 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 $6.4 million and $4.8 million for the three months ended March 31, 2019 and 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 three months ended March 31, 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 three months ended March 31, 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 $1.9 million for the three months ended March 31, 2019 and 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 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 -year period, and compensation expense will be recognized over the requisite service period and is included in general and administrative expenses on the Company’s Condensed Consolidated Statements of Operations. The OMP Phantom Unit Awards are accounted for as liability-classified awards since the awards will settle in cash, and equity-based compensation cost is accounted for under the fair value method in accordance with GAAP. Under the fair value method for liability-classified awards, compensation cost 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 three months ended March 31, 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 $0.7 million and $0.1 million for the three months ended March 31, 2019 and 2018 , respectively, and is included in general and administrative expenses on the Company’s Condensed Consolidated Statements of Operations. OMP restricted unit awards. During the three months ended March 31, 2019 , independent directors of OMP were granted 16,170 restricted unit awards, which vest over a one -year period with a weighted average grant date fair value of $18.57 per common unit. These awards are accounted for as equity-classified awards since the awards will settle in common units upon vesting. Equity-based compensation cost is accounted for under the fair value method in accordance with GAAP. Under the fair value method for equity-classified awards, compensation cost is measured at the grant date based on the fair value of the award and is recognized over the vesting period. Compensation cost associated with these awards was approximately $0.1 million and $0.1 million for the three months ended March 31, 2019 and 2018 , respectively, and is included in general and administrative expenses on the Company’s Condensed Consolidated Statements of Operations.

Earnings (Loss) Per Share

Earnings (Loss) Per Share	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Earnings (Loss) Per Share	Earnings (Loss) Per Share Basic 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 months ended March 31, 2019 and 2018 : Three Months Ended March 31, 2019 2018 (In thousands) Basic weighted average common shares outstanding 314,464 290,105 Dilutive effect of restricted stock awards and PSUs (1) — 1,633 Diluted weighted average common shares outstanding 314,464 291,738 __________________ (1) No unvested stock awards were included in computing earnings (loss) per share for the three months ended March 31, 2019 because the effects were anti-dilutive. For the three months ended March 31, 2019 , 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 Company excluded the unvested stock awards from the diluted earnings (loss) per share calculation for the three months ended March 31, 2018 because the effects were anti-dilutive based on 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 March 31, 2019 2018 (In thousands) Restricted stock awards and PSUs 9,800 5,281 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 March 31, 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 months ended March 31, 2019 and 2018 .

Business Segment Information

Business Segment Information	3 Months Ended
	Mar. 31, 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 (“ OMS ”) 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 the Company’s crude oil and natural gas wells operated by OPNA and other third party operators. 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 (“OWS”) performs completion services for the Company’s crude oil and natural gas wells operated by OPNA. 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 OMS and OWS for OPNA’s working 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 months ended March 31, 2018 , the Company has revised the condensed consolidated financial statements and business segment financial information to reflect the correction of errors, 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 Production Midstream Services Well Services Eliminations Consolidated (In thousands) Three months ended March 31, 2019: Revenues from non-affiliates $ 517,253 $ 48,021 $ 10,458 $ — $ 575,732 Inter-segment revenues — 58,561 22,173 (80,734 ) — Total revenues 517,253 106,582 32,631 (80,734 ) 575,732 Operating income 1,924 49,806 815 (2,101 ) 50,444 Other income (expense) (158,382 ) (3,748 ) 5 — (162,125 ) Income (loss) before income taxes including non-controlling interests $ (156,458 ) $ 46,058 $ 820 $ (2,101 ) $ (111,681 ) General and administrative $ 27,527 $ 8,861 $ 7,461 $ (9,390 ) $ 34,459 Equity-based compensation 8,580 465 561 (593 ) 9,013 Three months ended March 31, 2018: Revenues from non-affiliates $ 434,304 $ 27,922 $ 11,586 $ — $ 473,812 Inter-segment revenues — 36,640 33,302 (69,942 ) — Total revenues 434,304 64,562 44,888 (69,942 ) 473,812 Operating income 79,962 32,237 8,148 (7,362 ) 112,985 Other expense (108,146 ) (258 ) (41 ) — (108,445 ) Income (loss) before income taxes including non-controlling interests $ (28,184 ) $ 31,979 $ 8,107 $ (7,362 ) $ 4,540 General and administrative $ 23,478 $ 6,414 $ 5,891 $ (7,843 ) $ 27,940 Equity-based compensation 6,454 370 385 (455 ) 6,754 At March 31, 2019: Property, plant and equipment, net $ 6,292,206 $ 949,100 $ 34,150 $ (218,714 ) $ 7,056,742 Total assets (1) 6,795,467 1,915,729 (96,226 ) (968,624 ) 7,646,346 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 ___________________ (1) Intercompany receivables (payables) for all segments were reclassified to capital contributions from (distributions to) parent and not included in total assets.

Leases

Leases	3 Months Ended
	Mar. 31, 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 reclasses of pre-existing balances, such as deferred rent, into the lease asset balance. P rior 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. For the three months ended March 31, 2019 , the Company incurred lease expenses, which includes short-term leases. The following table sets forth the Company’s components of lease expense: Three Months Ended March 31, 2019 (In thousands) Operating lease costs $ 11,676 Variable lease costs (1) 1,040 Short-term lease costs 463 Finance lease costs: Amortization of ROU assets 566 Interest on lease liabilities 55 Total lease costs $ 13,800 ___________________ (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 March 31, 2019 , maturities of the Company’s lease liabilities are as follows: Operating Leases Finance Leases (In thousands) 2019 (excluding the three months ended March 31, 2019) $ 12,804 $ 1,880 2020 3,643 2,495 2021 1,140 1,658 2022 2,297 888 2023 2,345 63 Thereafter 12,801 361 Total future lease payments $ 35,030 $ 7,345 Less: Imputed interest 4,288 514 Present value of future lease payments $ 30,742 $ 6,831 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 March 31, 2019 (In thousands) Assets Operating lease assets Operating right-of-use assets $ 24,741 Finance lease assets (1) Other assets 6,855 Total lease assets $ 31,596 Liabilities Current Operating lease liabilities Current operating lease liabilities $ 13,135 Finance lease liabilities Other current liabilities 2,485 Long-term Operating lease liabilities Operating lease liabilities 17,610 Finance lease liabilities Other liabilities 4,530 Total lease liabilities $ 37,760 ___________________ (1) Finance lease ROU assets are recorded net of accumulated amortization of $0.6 million as of March 31, 2019 . Supplemental cash flow information and non-cash transactions related to the Company’s leases are as follows: March 31, 2019 (In thousands) Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 4,671 Operating cash flows from finance leases 55 Financing cash flows from finance leases 256 ROU assets obtained in exchange for lease obligations Operating leases $ 5,029 Finance leases 1,433 Weighted-average remaining lease term and discount rate for the Company’s are as follows: As of March 31, 2019 Operating Leases Weighted average remaining lease term 6.3 years Weighted average discount rate 3.9 % Finance Leases Weighted average remaining lease term 3.8 years Weighted average discount rate 3.6 %
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 reclasses of pre-existing balances, such as deferred rent, into the lease asset balance. P rior 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. For the three months ended March 31, 2019 , the Company incurred lease expenses, which includes short-term leases. The following table sets forth the Company’s components of lease expense: Three Months Ended March 31, 2019 (In thousands) Operating lease costs $ 11,676 Variable lease costs (1) 1,040 Short-term lease costs 463 Finance lease costs: Amortization of ROU assets 566 Interest on lease liabilities 55 Total lease costs $ 13,800 ___________________ (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 March 31, 2019 , maturities of the Company’s lease liabilities are as follows: Operating Leases Finance Leases (In thousands) 2019 (excluding the three months ended March 31, 2019) $ 12,804 $ 1,880 2020 3,643 2,495 2021 1,140 1,658 2022 2,297 888 2023 2,345 63 Thereafter 12,801 361 Total future lease payments $ 35,030 $ 7,345 Less: Imputed interest 4,288 514 Present value of future lease payments $ 30,742 $ 6,831 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 March 31, 2019 (In thousands) Assets Operating lease assets Operating right-of-use assets $ 24,741 Finance lease assets (1) Other assets 6,855 Total lease assets $ 31,596 Liabilities Current Operating lease liabilities Current operating lease liabilities $ 13,135 Finance lease liabilities Other current liabilities 2,485 Long-term Operating lease liabilities Operating lease liabilities 17,610 Finance lease liabilities Other liabilities 4,530 Total lease liabilities $ 37,760 ___________________ (1) Finance lease ROU assets are recorded net of accumulated amortization of $0.6 million as of March 31, 2019 . Supplemental cash flow information and non-cash transactions related to the Company’s leases are as follows: March 31, 2019 (In thousands) Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 4,671 Operating cash flows from finance leases 55 Financing cash flows from finance leases 256 ROU assets obtained in exchange for lease obligations Operating leases $ 5,029 Finance leases 1,433 Weighted-average remaining lease term and discount rate for the Company’s are as follows: As of March 31, 2019 Operating Leases Weighted average remaining lease term 6.3 years Weighted average discount rate 3.9 % Finance Leases Weighted average remaining lease term 3.8 years Weighted average discount rate 3.6 %

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Included below is a discussion of the Company’s various future commitments as of March 31, 2019 . The amounts disclosed represent undiscounted cash flows on a gross basis, and no inflation elements have been applied. Volume commitment agreements. As of March 31, 2019 , the Company had certain agreements with an aggregate requirement to deliver or transport a minimum quantity of approximately 53.1 MMBbl of crude oil, 41.3 MMBbl of natural gas liquids, 908.2 Bcf of natural gas and 36.8 MMBbl of water, prior to any applicable volume credits, within specified timeframes, all of which are ten years or less. The estimable future commitments under these agreements were approximately $677.2 million as of March 31, 2019 . 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 March 31, 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. 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 Oasis Midstream Services LLC, 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 Oasis Midstream Partners LP 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. 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.

Condensed Consolidating Financi

Condensed Consolidating Financial Information	3 Months Ended
	Mar. 31, 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 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. For the three months ended March 31, 2018, the Company has revised the condensed consolidating financial statements to reflect the correction of errors, which had no effect on the Company’s net income. All impacts of the revision are included in the Combined Guarantor Subsidiaries financial information. Please see Note 2 — Summary of Significant Accounting Policies for more information related to the revision. Condensed Consolidating Balance Sheet March 31, 2019 Parent/ Combined Combined Non-guarantor Subsidiaries Intercompany Consolidated (In thousands, except share data) ASSETS Current assets Cash and cash equivalents $ 144 $ 10,039 $ 5,259 $ — $ 15,442 Accounts receivable, net — 453,220 3,419 — 456,639 Accounts receivable - affiliates 597,551 80,273 79,659 (757,483 ) — Inventory — 35,997 272 — 36,269 Prepaid expenses 503 6,535 1,366 — 8,404 Derivative instruments — 4,467 — — 4,467 Other current assets — 309 — — 309 Total current assets 598,198 590,840 89,975 (757,483 ) 521,530 Property, plant and equipment Oil and gas properties (successful efforts method) — 9,085,886 — (12,801 ) 9,073,085 Other property and equipment — 233,131 983,632 — 1,216,763 Less: accumulated depreciation, depletion, amortization and impairment — (3,161,469 ) (71,637 ) — (3,233,106 ) Total property, plant and equipment, net — 6,157,548 911,995 (12,801 ) 7,056,742 Investments in and advances to subsidiaries 4,824,586 373,669 — (5,198,255 ) — Derivative instruments — 181 — — 181 Deferred income taxes 236,242 — — (236,242 ) — Long-term inventory — 13,767 — — 13,767 Operating right-of-use assets — 21,639 3,102 — 24,741 Other assets — 26,705 2,680 — 29,385 Total assets $ 5,659,026 $ 7,184,349 $ 1,007,752 $ (6,204,781 ) $ 7,646,346 LIABILITIES AND STOCKHOLDERS’ EQUITY Current liabilities Accounts payable $ — $ 10,024 $ 148 $ — $ 10,172 Accounts payable - affiliates 47,402 677,210 32,871 (757,483 ) — Revenues and production taxes payable — 249,160 409 — 249,569 Accrued liabilities 211 274,910 63,698 — 338,819 Accrued interest payable 20,758 549 624 — 21,931 Derivative instruments — 27,663 — — 27,663 Advances from joint interest partners — 5,072 — — 5,072 Current operating lease liabilities — 10,796 2,339 — 13,135 Other current liabilities — 2,469 16 — 2,485 Total current liabilities 68,371 1,257,853 100,105 (757,483 ) 668,846 Long-term debt 1,953,333 493,000 345,000 — 2,791,333 Deferred income taxes — 532,750 — (236,242 ) 296,508 Asset retirement obligations — 51,871 1,533 — 53,404 Derivative instruments — 1,271 — — 1,271 Operating lease liabilities — 16,825 785 — 17,610 Other liabilities — 5,928 311 — 6,239 Total liabilities 2,021,704 2,359,498 447,734 (993,725 ) 3,835,211 Stockholders’ equity Capital contributions from affiliates — 3,225,865 164,887 (3,390,752 ) — Common stock, $0.01 par value: 900,000,000 shares authorized; 324,829,258 shares issued and 322,051,268 shares outstanding 3,182 — — — 3,182 Treasury stock, at cost: 2,777,990 shares (33,286 ) — — — (33,286 ) Additional paid-in-capital 3,087,592 8,234 — (8,743 ) 3,087,083 Retained earnings 579,834 1,404,403 82,887 (1,499,317 ) 567,807 Oasis share of stockholders’ equity 3,637,322 4,638,502 247,774 (4,898,812 ) 3,624,786 Non-controlling interests — 186,349 312,244 (312,244 ) 186,349 Total stockholders’ equity 3,637,322 4,824,851 560,018 (5,211,056 ) 3,811,135 Total liabilities and stockholders’ equity $ 5,659,026 $ 7,184,349 $ 1,007,752 $ (6,204,781 ) $ 7,646,346 Condensed Consolidating Balance Sheet December 31, 2018 Parent/ Combined Combined Non-guarantor Subsidiaries 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 4,910,111 367,141 — (5,277,252 ) — 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 $ 5,773,715 $ 7,196,513 $ 964,252 $ (6,308,338 ) $ 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 Capital contributions from affiliates — 3,226,837 177,049 (3,403,886 ) — Common stock, $0.01 par value: 900,000,000 shares authorized; 320,469,049 shares issued and 318,377,161 shares outstanding 3,157 — — — 3,157 Treasury stock, at cost: 2,091,888 shares (29,025 ) — — — (29,025 ) Additional paid-in-capital 3,078,203 8,295 — (8,743 ) 3,077,755 Retained earnings 691,824 1,492,194 61,581 (1,562,910 ) 682,689 Oasis share of stockholders’ equity 3,744,159 4,727,326 238,630 (4,975,539 ) 3,734,576 Non-controlling interests — 184,304 312,815 (312,815 ) 184,304 Total stockholders’ equity 3,744,159 4,911,630 551,445 (5,288,354 ) 3,918,880 Total liabilities and stockholders’ equity $ 5,773,715 $ 7,196,513 $ 964,252 $ (6,308,338 ) $ 7,626,142 Condensed Consolidating Statement of Operations Three Months Ended March 31, 2019 Parent/ Combined Combined Non-guarantor Subsidiaries Intercompany Consolidated (In thousands) Revenues Oil and gas revenues $ — $ 368,782 $ — $ — $ 368,782 Purchased oil and gas sales — 148,471 — — 148,471 Midstream revenues — 3,070 91,651 (46,700 ) 48,021 Well services revenues — 10,458 — — 10,458 Total revenues — 530,781 91,651 (46,700 ) 575,732 Operating expenses Lease operating expenses — 71,785 — (13,341 ) 58,444 Midstream expenses — 1,848 26,915 (12,034 ) 16,729 Well services expenses — 6,970 — — 6,970 Marketing, transportation and gathering expenses — 45,237 — (10,287 ) 34,950 Purchased oil and gas expenses — 149,904 — — 149,904 Production taxes — 29,618 — — 29,618 Depreciation, depletion and amortization — 186,069 8,929 (5,165 ) 189,833 Exploration expenses — 830 — — 830 Impairment — 629 — — 629 General and administrative expenses 9,087 20,825 8,720 (4,173 ) 34,459 Total operating expenses 9,087 513,715 44,564 (45,000 ) 522,366 Loss on sale of properties — (2,922 ) — — (2,922 ) Operating income (loss) (9,087 ) 14,144 47,087 (1,700 ) 50,444 Other income (expense) Equity in earnings (loss) of subsidiaries (89,492 ) 43,339 — 46,153 — Net loss on derivative instruments — (117,611 ) — — (117,611 ) Interest expense, net of capitalized interest (32,876 ) (7,844 ) (3,748 ) — (44,468 ) Other expense — (46 ) — — (46 ) Total other expense (122,368 ) (82,162 ) (3,748 ) 46,153 (162,125 ) Income (loss) before income taxes (131,455 ) (68,018 ) 43,339 44,453 (111,681 ) Income tax benefit (expense) 16,573 (12,870 ) — — 3,703 Net income (loss) including non-controlling interests (114,882 ) (80,888 ) 43,339 44,453 (107,978 ) Less: Net income attributable to non-controlling interests — 6,904 21,796 (21,796 ) 6,904 Net income (loss) attributable to Oasis $ (114,882 ) $ (87,792 ) $ 21,543 $ 66,249 $ (114,882 ) Condensed Consolidating Statement of Operations Three Months Ended March 31, 2018 Parent/ Combined Combined Non-guarantor Subsidiaries Intercompany Consolidated (In thousands) Revenues Oil and gas revenues $ — $ 366,595 $ — $ — $ 366,595 Purchased oil and gas sales — 67,709 — — 67,709 Midstream revenues — 1,150 61,421 (34,649 ) 27,922 Well services revenues — 11,586 — — 11,586 Total revenues — 447,040 61,421 (34,649 ) 473,812 Operating expenses Lease operating expenses — 55,699 — (10,918 ) 44,781 Midstream expenses — 746 17,116 (9,877 ) 7,985 Well services expenses — 7,387 — — 7,387 Marketing, transportation and gathering expenses — 26,672 — (5,659 ) 21,013 Purchased oil and gas expenses — 70,594 — — 70,594 Production taxes — 31,000 — — 31,000 Depreciation, depletion and amortization — 146,227 6,364 (3,326 ) 149,265 Exploration expenses — 769 — — 769 Impairment — 93 — — 93 General and administrative expenses 7,232 17,678 6,150 (3,120 ) 27,940 Total operating expenses 7,232 356,865 29,630 (32,900 ) 360,827 Operating income (loss) (7,232 ) 90,175 31,791 (1,749 ) 112,985 Other income (expense) Equity in earnings of subsidiaries 32,164 31,529 — (63,693 ) — Net loss on derivative instruments — (71,116 ) — — (71,116 ) Interest expense, net of capitalized interest (32,446 ) (4,438 ) (262 ) — (37,146 ) Other expense — (183 ) — — (183 ) Total other expense (282 ) (44,208 ) (262 ) (63,693 ) (108,445 ) Income (loss) before income taxes (7,514 ) 45,967 31,529 (65,442 ) 4,540 Income tax benefit (expense) 8,104 (8,932 ) — — (828 ) Net income including non-controlling interests 590 37,035 31,529 (65,442 ) 3,712 Less: Net income attributable to non-controlling interests — 3,122 21,574 (21,574 ) 3,122 Net income attributable to Oasis $ 590 $ 33,913 $ 9,955 $ (43,868 ) $ 590 Condensed Consolidating Statement of Cash Flows Three Months Ended March 31, 2019 Parent/ Combined Combined Non-guarantor Subsidiaries Intercompany Consolidated (In thousands) Cash flows from operating activities: Net income (loss) including non-controlling interests $ (114,882 ) $ (80,888 ) $ 43,339 $ 44,453 $ (107,978 ) Adjustments to reconcile net income (loss) including non-controlling interests to net cash provided by operating activities: Equity in earnings (loss) of subsidiaries 89,492 (43,339 ) — (46,153 ) — Depreciation, depletion and amortization — 186,069 8,929 (5,165 ) 189,833 Loss on sale of properties — 2,922 — — 2,922 Impairment — 629 — — 629 Deferred income taxes (16,573 ) 13,026 — — (3,547 ) Derivative instruments — 117,611 — — 117,611 Equity-based compensation expenses 8,339 555 119 — 9,013 Deferred financing costs amortization and other 4,058 2,681 191 — 6,930 Working capital and other changes: Change in accounts receivable, net 45,831 (74,291 ) 208 (42,831 ) (71,083 ) Change in inventory — (3,184 ) — — (3,184 ) Change in prepaid expenses (130 ) 1,583 52 — 1,505 Change in accounts payable, interest payable and accrued liabilities (11,909 ) 2,306 3,438 42,831 36,666 Change in other assets and liabilities, net — (4,165 ) (226 ) — (4,391 ) Net cash provided by operating activities 4,226 121,515 56,050 (6,865 ) 174,926 Cash flows from investing activities: Capital expenditures — (187,990 ) (49,458 ) — (237,448 ) Derivative settlements — 13,446 — — 13,446 Net cash used in investing activities — (174,544 ) (49,458 ) — (224,002 ) Cash flows from financing activities: Proceeds from Revolving Credit Facilities — 388,000 32,000 — 420,000 Principal payments on Revolving Credit Facilities — (363,000 ) (5,000 ) — (368,000 ) Deferred financing costs — — (43 ) — (43 ) Purchases of treasury stock (4,261 ) — — — (4,261 ) Distributions to non-controlling interests — 16,985 (21,922 ) — (4,937 ) Investment in subsidiaries / capital contributions from parent — 5,923 (12,788 ) 6,865 — Other — (202 ) (229 ) — (431 ) Net cash provided by (used in) financing activities (4,261 ) 47,706 (7,982 ) 6,865 42,328 Decrease in cash and cash equivalents (35 ) (5,323 ) (1,390 ) — (6,748 ) Cash and cash equivalents at beginning of period 179 15,362 6,649 — 22,190 Cash and cash equivalents at end of period $ 144 $ 10,039 $ 5,259 $ — $ 15,442 Condensed Consolidating Statement of Cash Flows Three Months Ended March 31, 2018 Parent/ Combined Combined Non-guarantor Subsidiaries Intercompany Consolidated (In thousands) Cash flows from operating activities: Net income including non-controlling interests $ 590 $ 37,035 $ 31,529 $ (65,442 ) $ 3,712 Adjustments to reconcile net income including non-controlling interests to net cash provided by operating activities: Equity in earnings of subsidiaries (32,164 ) (31,529 ) — 63,693 — Depreciation, depletion and amortization — 146,227 6,364 (3,326 ) 149,265 Impairment — 93 — — 93 Deferred income taxes (8,104 ) 8,932 — — 828 Derivative instruments — 71,116 — — 71,116 Equity-based compensation expenses 6,418 273 63 — 6,754 Deferred financing costs amortization and other 3,929 1,432 114 — 5,475 Working capital and other changes: Change in accounts receivable, net 51,714 (23,888 ) 36,992 (70,526 ) (5,708 ) Change in inventory — (3,672 ) — — (3,672 ) Change in prepaid expenses (180 ) 641 31 — 492 Change in accounts payable, interest payable and accrued liabilities (12,832 ) (66,000 ) 8,062 70,526 (244 ) Change in other assets and liabilities, net — 248 — — 248 Net cash provided by operating activities 9,371 140,908 83,155 (5,075 ) 228,359 Cash flows from investing activities: Capital expenditures — (169,994 ) (84,844 ) — (254,838 ) Acquisitions — (520,728 ) — — (520,728 ) Derivative settlements — (36,974 ) — — (36,974 ) Other — (28 ) — — (28 ) Net cash used in investing activities — (727,724 ) (84,844 ) — (812,568 ) Cash flows from financing activities: Proceeds from Revolving Credit Facilities — 1,413,000 57,000 — 1,470,000 Principal payments on Revolving Credit Facilities — (857,000 ) (18,000 ) — (875,000 ) Deferred financing costs — (215 ) — — (215 ) Purchases of treasury stock (6,021 ) — — — (6,021 ) Distributions to non-controlling interests — 34,866 (38,316 ) — (3,450 ) Investment in subsidiaries / capital contributions from parent (3,259 ) (5,986 ) 4,170 5,075 — Other (90 ) — — — (90 ) Net cash provided by (used in) financing activities (9,370 ) 584,665 4,854 5,075 585,224 Increase (decrease) in cash and cash equivalents 1 (2,151 ) 3,165 — 1,015 Cash and cash equivalents at beginning of period 178 15,659 883 — 16,720 Cash and cash equivalents at end of period $ 179 $ 13,508 $ 4,048 $ — $ 17,735

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events The 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)	3 Months Ended
	Mar. 31, 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 . 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 LLC (“ OMP GP ”), the general partner to OMP , OMP is a variable interest entity (“ VIE ”). 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 as of March 31, 2019 . All intercompany balances and transactions have been eliminated upon consolidation
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 FASB issued Accounting Standards Update No. 2016-02, Leases (Topic 842) (“ASU 2016-02”), 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 short-term leases, or 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.
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. T he 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 Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Impacts of Revisions to the Company’s Condensed Consolidated Statement of Operations	For the three months ended March 31, 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 March 31, 2018 As Reported Revision As Revised (In thousands, except per share data) Oil and gas revenues $ 363,671 $ 2,924 $ 366,595 Purchased oil and gas sales 18,037 49,672 67,709 Total revenues 421,216 52,596 473,812 Purchased oil and gas expenses 17,998 52,596 70,594 Total operating expenses 308,231 52,596 360,827 Net income attributable to Oasis 590 — 590 Earnings attributable to Oasis per share: Basic $ 0.00 $ — $ 0.00 Diluted $ 0.00 $ — $ 0.00

Revenue Recognition (Tables)

Revenue Recognition (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2019 : (In thousands) 2019 (excluding the three months ended March 31, 2019) $ 20,430 2020 26,905 2021 25,656 2022 19,263 2023 12,642 Thereafter 14,642 Total $ 119,538
Exploration and Production
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 months ended March 31, 2019 and 2018 : Exploration and Production Revenues Three Months Ended March 31, 2019 2018 (In thousands) Crude oil revenues $ 318,120 $ 326,310 Purchased crude oil sales 147,136 67,660 Natural gas revenues 27,452 26,962 Purchased natural gas sales 1,335 49 NGL revenues 23,210 13,323 Total exploration and production revenues $ 517,253 $ 434,304
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 months ended March 31, 2019 and 2018 : Midstream Revenues (1) Three Months Ended March 31, 2019 2018 (In thousands) Midstream service revenues Crude oil and natural gas revenues $ 24,664 $ 18,029 Produced and flowback water revenues 9,033 8,876 Total midstream service revenues $ 33,697 $ 26,905 Midstream product revenues Natural gas and NGL revenues $ 12,797 $ — Freshwater revenues 1,527 1,017 Total midstream product revenues $ 14,324 $ 1,017 Total midstream revenues $ 48,021 $ 27,922 __________________ (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 months ended March 31, 2019 and 2018 : Well Services Revenues (1) Three Months Ended March 31, 2019 2018 (In thousands) Hydraulic fracturing revenues $ 9,775 $ 10,426 Equipment rental revenues 683 1,160 Total well services revenues $ 10,458 $ 11,586 __________________ (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)	3 Months Ended
	Mar. 31, 2019
Inventory Disclosure [Abstract]
Components of Inventory	Total inventory consists of the following: March 31, 2019 December 31, 2018 (In thousands) Inventory Crude oil inventory $ 17,542 $ 14,933 Equipment and materials 18,727 18,195 Total inventory $ 36,269 $ 33,128 Long-term inventory Linefill in third party pipelines $ 13,767 $ 12,260 Total long-term inventory $ 13,767 $ 12,260 Total $ 50,036 $ 45,388
Components of Long-term Inventory	Total inventory consists of the following: March 31, 2019 December 31, 2018 (In thousands) Inventory Crude oil inventory $ 17,542 $ 14,933 Equipment and materials 18,727 18,195 Total inventory $ 36,269 $ 33,128 Long-term inventory Linefill in third party pipelines $ 13,767 $ 12,260 Total long-term inventory $ 13,767 $ 12,260 Total $ 50,036 $ 45,388

Accounts Receivable, Net (Table

Accounts Receivable, Net (Tables)	3 Months Ended
	Mar. 31, 2019
Receivables [Abstract]
Schedule of Accounts Receivable, Net	The following table sets forth the Company’s accounts receivable, net: March 31, 2019 December 31, 2018 (In thousands) Trade accounts $ 332,889 $ 245,546 Joint interest accounts 114,502 133,375 Other accounts 10,774 10,207 Total 458,165 389,128 Allowance for doubtful accounts (1,526 ) (1,526 ) Total accounts receivable, net $ 456,639 $ 387,602

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2019 Level 1 Level 2 Level 3 Total (In thousands) Assets: Money market funds $ 144 $ — $ — $ 144 Commodity derivative instruments (see Note 8) — 4,648 — 4,648 Total assets $ 144 $ 4,648 $ — $ 4,792 Liabilities: Commodity derivative instruments (see Note 8) $ — $ 28,934 $ — $ 28,934 Total liabilities $ — $ 28,934 $ — $ 28,934 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)	3 Months Ended
	Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Outstanding Commodity Derivative Instruments	At March 31, 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 3,881,000 Bbl $ 54.02 $ (23,216 ) Crude oil 2019 Basis swaps ICE Brent-NYMEX WTI 244,000 Bbl $ 9.68 549 Crude oil 2019 Basis swaps Midland-NYMEX WTI 488,000 Bbl $ (6.71 ) (2,971 ) Crude oil 2019 Basis swaps Houston-NYMEX WTI 549,000 Bbl $ 4.55 (305 ) Crude oil 2019 Two-way collar NYMEX WTI 3,542,000 Bbl $ 57.65 $ 74.72 5,381 Crude oil 2019 Three-way collar NYMEX WTI 3,300,000 Bbl $ 40.37 $ 51.43 $ 66.81 (2,375 ) Crude oil 2020 Fixed price swaps NYMEX WTI 829,000 Bbl $ 56.60 (2,363 ) Crude oil 2020 Two-way collar NYMEX WTI 372,000 Bbl $ 58.08 $ 76.05 1,270 Crude oil 2020 Three-way collar NYMEX WTI 1,712,000 Bbl $ 40.00 $ 55.39 $ 61.13 (2,081 ) Crude oil 2021 Three-way collar NYMEX WTI 124,000 Bbl $ 40.00 $ 56.18 $ 60.43 (59 ) Natural gas 2019 Fixed price swaps NYMEX HH 8,796,000 MMBtu $ 2.92 1,148 Natural gas 2019 Basis swaps IF NNG Ventura-NYMEX HH 2,275,000 MMBtu $ 0.02 736 $ (24,286 ) Subsequent to March 31, 2019 , the Company entered into additional fixed price swaps, basis swaps and two-way and three-way costless collars. As of May 8, 2019 , the Company had the following outstanding commodity derivative contracts: Commodity Settlement Derivative Index Volumes Weighted Average Prices Fixed Price Swaps Basis Swaps Sub-Floor Floor Ceiling Crude oil 2019 Fixed price swaps NYMEX WTI 4,952,000 Bbl $ 56.15 Crude oil 2019 Basis swaps ICE Brent-NYMEX WTI 244,000 Bbl $ 9.68 Crude oil 2019 Basis swaps Midland-NYMEX WTI 488,000 Bbl $ (6.71 ) Crude oil 2019 Basis swaps Houston-NYMEX WTI 549,000 Bbl $ 4.55 Crude oil 2019 Two-way collar NYMEX WTI 3,848,000 Bbl $ 57.68 $ 74.04 Crude oil 2019 Three-way collar NYMEX WTI 3,300,000 Bbl $ 40.37 $ 51.43 $ 66.81 Crude oil 2020 Fixed price swaps NYMEX WTI 2,171,000 Bbl $ 59.09 Crude oil 2020 Two-way collar NYMEX WTI 434,000 Bbl $ 58.07 $ 74.64 Crude oil 2020 Three-way collar NYMEX WTI 3,110,000 Bbl $ 40.00 $ 54.79 $ 63.75 Crude oil 2021 Fixed price swaps NYMEX WTI 93,000 Bbl $ 58.85 Crude oil 2021 Three-way collar NYMEX WTI 186,000 Bbl $ 40.00 $ 54.96 $ 62.31 Natural gas 2019 Fixed price swaps NYMEX HH 8,796,000 MMBtu $ 2.92 Natural gas 2019 Basis swaps IF NNG Ventura-NYMEX HH 2,275,000 MMBtu $ 0.02
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 March 31, Statements of Operations Location 2019 2018 (In thousands) Net loss on derivative instruments $ (117,611 ) $ (71,116 )
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: March 31, 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 $ 6,734 $ (2,267 ) $ 4,467 Commodity contracts Derivative instruments — non-current assets 2,504 (2,323 ) 181 Total derivatives assets $ 9,238 $ (4,590 ) $ 4,648 Derivatives liabilities: Commodity contracts Derivative instruments — current liabilities $ 36,599 $ (8,936 ) $ 27,663 Commodity contracts Derivative instruments — non-current liabilities 1,875 (604 ) 1,271 Total derivatives liabilities $ 38,474 $ (9,540 ) $ 28,934 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: March 31, 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 $ 6,734 $ (2,267 ) $ 4,467 Commodity contracts Derivative instruments — non-current assets 2,504 (2,323 ) 181 Total derivatives assets $ 9,238 $ (4,590 ) $ 4,648 Derivatives liabilities: Commodity contracts Derivative instruments — current liabilities $ 36,599 $ (8,936 ) $ 27,663 Commodity contracts Derivative instruments — non-current liabilities 1,875 (604 ) 1,271 Total derivatives liabilities $ 38,474 $ (9,540 ) $ 28,934 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)	3 Months Ended
	Mar. 31, 2019
Property, Plant and Equipment [Abstract]
Schedule of Property, Plant and Equipment	The following table sets forth the Company’s property, plant and equipment: March 31, 2019 December 31, 2018 (In thousands) Proved oil and gas properties (1) $ 8,039,585 $ 7,878,104 Less: Accumulated depreciation, depletion, amortization and impairment (3,035,748 ) (2,853,353 ) Proved oil and gas properties, net 5,003,837 5,024,751 Unproved oil and gas properties 1,033,500 1,034,085 Other property and equipment (2) 1,216,763 1,151,772 Less: Accumulated depreciation (197,358 ) (183,499 ) Other property and equipment, net 1,019,405 968,273 Total property, plant and equipment, net $ 7,056,742 $ 7,027,109 __________________ (1) Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $41.6 million and $40.5 million at March 31, 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 March 31, 2019 and December 31, 2018 , respectively.

Long-Term Debt (Tables)

Long-Term Debt (Tables)	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Schedule of Long-Term Debt	The Company’s long-term debt consists of the following: March 31, 2019 December 31, 2018 (In thousands) Oasis Credit Facility $ 493,000 $ 468,000 OMP Credit Facility 345,000 318,000 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 (19,692 ) (20,865 ) Less: unamortized debt discount on senior unsecured convertible notes (66,384 ) (69,268 ) Total long-term debt $ 2,791,333 $ 2,735,276

Asset Retirement Obligations (T

Asset Retirement Obligations (Tables)	3 Months Ended
	Mar. 31, 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 three months ended March 31, 2019 : (In thousands) Balance at December 31, 2018 $ 52,449 Liabilities incurred during period 405 Liabilities settled during period (72 ) Accretion expense during period (1) 718 Revisions to estimates 827 Balance at March 31, 2019 $ 54,327 ___________________ (1) Included in depreciation, depletion and amortization on the Company’s Condensed Consolidated Statements of Operations.

Equity-Based Compensation (Tabl

Equity-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [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 three months ended March 31, 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)	3 Months Ended
	Mar. 31, 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 months ended March 31, 2019 and 2018 : Three Months Ended March 31, 2019 2018 (In thousands) Basic weighted average common shares outstanding 314,464 290,105 Dilutive effect of restricted stock awards and PSUs (1) — 1,633 Diluted weighted average common shares outstanding 314,464 291,738 __________________ (1) No unvested stock awards were included in computing earnings (loss) per share for the three months ended March 31, 2019 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 March 31, 2019 2018 (In thousands) Restricted stock awards and PSUs 9,800 5,281

Business Segment Information (T

Business Segment Information (Tables)	3 Months Ended
	Mar. 31, 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 Production Midstream Services Well Services Eliminations Consolidated (In thousands) Three months ended March 31, 2019: Revenues from non-affiliates $ 517,253 $ 48,021 $ 10,458 $ — $ 575,732 Inter-segment revenues — 58,561 22,173 (80,734 ) — Total revenues 517,253 106,582 32,631 (80,734 ) 575,732 Operating income 1,924 49,806 815 (2,101 ) 50,444 Other income (expense) (158,382 ) (3,748 ) 5 — (162,125 ) Income (loss) before income taxes including non-controlling interests $ (156,458 ) $ 46,058 $ 820 $ (2,101 ) $ (111,681 ) General and administrative $ 27,527 $ 8,861 $ 7,461 $ (9,390 ) $ 34,459 Equity-based compensation 8,580 465 561 (593 ) 9,013 Three months ended March 31, 2018: Revenues from non-affiliates $ 434,304 $ 27,922 $ 11,586 $ — $ 473,812 Inter-segment revenues — 36,640 33,302 (69,942 ) — Total revenues 434,304 64,562 44,888 (69,942 ) 473,812 Operating income 79,962 32,237 8,148 (7,362 ) 112,985 Other expense (108,146 ) (258 ) (41 ) — (108,445 ) Income (loss) before income taxes including non-controlling interests $ (28,184 ) $ 31,979 $ 8,107 $ (7,362 ) $ 4,540 General and administrative $ 23,478 $ 6,414 $ 5,891 $ (7,843 ) $ 27,940 Equity-based compensation 6,454 370 385 (455 ) 6,754 At March 31, 2019: Property, plant and equipment, net $ 6,292,206 $ 949,100 $ 34,150 $ (218,714 ) $ 7,056,742 Total assets (1) 6,795,467 1,915,729 (96,226 ) (968,624 ) 7,646,346 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 ___________________ (1) Intercompany receivables (payables) for all segments were reclassified to capital contributions from (distributions to) parent and not included in total assets.

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 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 expense: Three Months Ended March 31, 2019 (In thousands) Operating lease costs $ 11,676 Variable lease costs (1) 1,040 Short-term lease costs 463 Finance lease costs: Amortization of ROU assets 566 Interest on lease liabilities 55 Total lease costs $ 13,800 ___________________ (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. Supplemental cash flow information and non-cash transactions related to the Company’s leases are as follows: March 31, 2019 (In thousands) Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 4,671 Operating cash flows from finance leases 55 Financing cash flows from finance leases 256 ROU assets obtained in exchange for lease obligations Operating leases $ 5,029 Finance leases 1,433
Maturities of the Company's lease liabilities	As of March 31, 2019 , maturities of the Company’s lease liabilities are as follows: Operating Leases Finance Leases (In thousands) 2019 (excluding the three months ended March 31, 2019) $ 12,804 $ 1,880 2020 3,643 2,495 2021 1,140 1,658 2022 2,297 888 2023 2,345 63 Thereafter 12,801 361 Total future lease payments $ 35,030 $ 7,345 Less: Imputed interest 4,288 514 Present value of future lease payments $ 30,742 $ 6,831
Maturities of the Company's lease liabilities	As of March 31, 2019 , maturities of the Company’s lease liabilities are as follows: Operating Leases Finance Leases (In thousands) 2019 (excluding the three months ended March 31, 2019) $ 12,804 $ 1,880 2020 3,643 2,495 2021 1,140 1,658 2022 2,297 888 2023 2,345 63 Thereafter 12,801 361 Total future lease payments $ 35,030 $ 7,345 Less: Imputed interest 4,288 514 Present value of future lease payments $ 30,742 $ 6,831
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 March 31, 2019 (In thousands) Assets Operating lease assets Operating right-of-use assets $ 24,741 Finance lease assets (1) Other assets 6,855 Total lease assets $ 31,596 Liabilities Current Operating lease liabilities Current operating lease liabilities $ 13,135 Finance lease liabilities Other current liabilities 2,485 Long-term Operating lease liabilities Operating lease liabilities 17,610 Finance lease liabilities Other liabilities 4,530 Total lease liabilities $ 37,760 ___________________ (1) Finance lease ROU assets are recorded net of accumulated amortization of $0.6 million as of March 31, 2019 .
Weighted-average remaining lease term and discount rate for the Company’s leases	Weighted-average remaining lease term and discount rate for the Company’s are as follows: As of March 31, 2019 Operating Leases Weighted average remaining lease term 6.3 years Weighted average discount rate 3.9 % Finance Leases Weighted average remaining lease term 3.8 years Weighted average discount rate 3.6 %

Condensed Consolidating Finan_2

Condensed Consolidating Financial Information (Tables)	3 Months Ended
	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Condensed Consolidating Balance Sheet	Condensed Consolidating Balance Sheet March 31, 2019 Parent/ Combined Combined Non-guarantor Subsidiaries Intercompany Consolidated (In thousands, except share data) ASSETS Current assets Cash and cash equivalents $ 144 $ 10,039 $ 5,259 $ — $ 15,442 Accounts receivable, net — 453,220 3,419 — 456,639 Accounts receivable - affiliates 597,551 80,273 79,659 (757,483 ) — Inventory — 35,997 272 — 36,269 Prepaid expenses 503 6,535 1,366 — 8,404 Derivative instruments — 4,467 — — 4,467 Other current assets — 309 — — 309 Total current assets 598,198 590,840 89,975 (757,483 ) 521,530 Property, plant and equipment Oil and gas properties (successful efforts method) — 9,085,886 — (12,801 ) 9,073,085 Other property and equipment — 233,131 983,632 — 1,216,763 Less: accumulated depreciation, depletion, amortization and impairment — (3,161,469 ) (71,637 ) — (3,233,106 ) Total property, plant and equipment, net — 6,157,548 911,995 (12,801 ) 7,056,742 Investments in and advances to subsidiaries 4,824,586 373,669 — (5,198,255 ) — Derivative instruments — 181 — — 181 Deferred income taxes 236,242 — — (236,242 ) — Long-term inventory — 13,767 — — 13,767 Operating right-of-use assets — 21,639 3,102 — 24,741 Other assets — 26,705 2,680 — 29,385 Total assets $ 5,659,026 $ 7,184,349 $ 1,007,752 $ (6,204,781 ) $ 7,646,346 LIABILITIES AND STOCKHOLDERS’ EQUITY Current liabilities Accounts payable $ — $ 10,024 $ 148 $ — $ 10,172 Accounts payable - affiliates 47,402 677,210 32,871 (757,483 ) — Revenues and production taxes payable — 249,160 409 — 249,569 Accrued liabilities 211 274,910 63,698 — 338,819 Accrued interest payable 20,758 549 624 — 21,931 Derivative instruments — 27,663 — — 27,663 Advances from joint interest partners — 5,072 — — 5,072 Current operating lease liabilities — 10,796 2,339 — 13,135 Other current liabilities — 2,469 16 — 2,485 Total current liabilities 68,371 1,257,853 100,105 (757,483 ) 668,846 Long-term debt 1,953,333 493,000 345,000 — 2,791,333 Deferred income taxes — 532,750 — (236,242 ) 296,508 Asset retirement obligations — 51,871 1,533 — 53,404 Derivative instruments — 1,271 — — 1,271 Operating lease liabilities — 16,825 785 — 17,610 Other liabilities — 5,928 311 — 6,239 Total liabilities 2,021,704 2,359,498 447,734 (993,725 ) 3,835,211 Stockholders’ equity Capital contributions from affiliates — 3,225,865 164,887 (3,390,752 ) — Common stock, $0.01 par value: 900,000,000 shares authorized; 324,829,258 shares issued and 322,051,268 shares outstanding 3,182 — — — 3,182 Treasury stock, at cost: 2,777,990 shares (33,286 ) — — — (33,286 ) Additional paid-in-capital 3,087,592 8,234 — (8,743 ) 3,087,083 Retained earnings 579,834 1,404,403 82,887 (1,499,317 ) 567,807 Oasis share of stockholders’ equity 3,637,322 4,638,502 247,774 (4,898,812 ) 3,624,786 Non-controlling interests — 186,349 312,244 (312,244 ) 186,349 Total stockholders’ equity 3,637,322 4,824,851 560,018 (5,211,056 ) 3,811,135 Total liabilities and stockholders’ equity $ 5,659,026 $ 7,184,349 $ 1,007,752 $ (6,204,781 ) $ 7,646,346 Condensed Consolidating Balance Sheet December 31, 2018 Parent/ Combined Combined Non-guarantor Subsidiaries 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 4,910,111 367,141 — (5,277,252 ) — 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 $ 5,773,715 $ 7,196,513 $ 964,252 $ (6,308,338 ) $ 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 Capital contributions from affiliates — 3,226,837 177,049 (3,403,886 ) — Common stock, $0.01 par value: 900,000,000 shares authorized; 320,469,049 shares issued and 318,377,161 shares outstanding 3,157 — — — 3,157 Treasury stock, at cost: 2,091,888 shares (29,025 ) — — — (29,025 ) Additional paid-in-capital 3,078,203 8,295 — (8,743 ) 3,077,755 Retained earnings 691,824 1,492,194 61,581 (1,562,910 ) 682,689 Oasis share of stockholders’ equity 3,744,159 4,727,326 238,630 (4,975,539 ) 3,734,576 Non-controlling interests — 184,304 312,815 (312,815 ) 184,304 Total stockholders’ equity 3,744,159 4,911,630 551,445 (5,288,354 ) 3,918,880 Total liabilities and stockholders’ equity $ 5,773,715 $ 7,196,513 $ 964,252 $ (6,308,338 ) $ 7,626,142
Condensed Consolidating Statement of Operations	Condensed Consolidating Statement of Operations Three Months Ended March 31, 2019 Parent/ Combined Combined Non-guarantor Subsidiaries Intercompany Consolidated (In thousands) Revenues Oil and gas revenues $ — $ 368,782 $ — $ — $ 368,782 Purchased oil and gas sales — 148,471 — — 148,471 Midstream revenues — 3,070 91,651 (46,700 ) 48,021 Well services revenues — 10,458 — — 10,458 Total revenues — 530,781 91,651 (46,700 ) 575,732 Operating expenses Lease operating expenses — 71,785 — (13,341 ) 58,444 Midstream expenses — 1,848 26,915 (12,034 ) 16,729 Well services expenses — 6,970 — — 6,970 Marketing, transportation and gathering expenses — 45,237 — (10,287 ) 34,950 Purchased oil and gas expenses — 149,904 — — 149,904 Production taxes — 29,618 — — 29,618 Depreciation, depletion and amortization — 186,069 8,929 (5,165 ) 189,833 Exploration expenses — 830 — — 830 Impairment — 629 — — 629 General and administrative expenses 9,087 20,825 8,720 (4,173 ) 34,459 Total operating expenses 9,087 513,715 44,564 (45,000 ) 522,366 Loss on sale of properties — (2,922 ) — — (2,922 ) Operating income (loss) (9,087 ) 14,144 47,087 (1,700 ) 50,444 Other income (expense) Equity in earnings (loss) of subsidiaries (89,492 ) 43,339 — 46,153 — Net loss on derivative instruments — (117,611 ) — — (117,611 ) Interest expense, net of capitalized interest (32,876 ) (7,844 ) (3,748 ) — (44,468 ) Other expense — (46 ) — — (46 ) Total other expense (122,368 ) (82,162 ) (3,748 ) 46,153 (162,125 ) Income (loss) before income taxes (131,455 ) (68,018 ) 43,339 44,453 (111,681 ) Income tax benefit (expense) 16,573 (12,870 ) — — 3,703 Net income (loss) including non-controlling interests (114,882 ) (80,888 ) 43,339 44,453 (107,978 ) Less: Net income attributable to non-controlling interests — 6,904 21,796 (21,796 ) 6,904 Net income (loss) attributable to Oasis $ (114,882 ) $ (87,792 ) $ 21,543 $ 66,249 $ (114,882 ) Condensed Consolidating Statement of Operations Three Months Ended March 31, 2018 Parent/ Combined Combined Non-guarantor Subsidiaries Intercompany Consolidated (In thousands) Revenues Oil and gas revenues $ — $ 366,595 $ — $ — $ 366,595 Purchased oil and gas sales — 67,709 — — 67,709 Midstream revenues — 1,150 61,421 (34,649 ) 27,922 Well services revenues — 11,586 — — 11,586 Total revenues — 447,040 61,421 (34,649 ) 473,812 Operating expenses Lease operating expenses — 55,699 — (10,918 ) 44,781 Midstream expenses — 746 17,116 (9,877 ) 7,985 Well services expenses — 7,387 — — 7,387 Marketing, transportation and gathering expenses — 26,672 — (5,659 ) 21,013 Purchased oil and gas expenses — 70,594 — — 70,594 Production taxes — 31,000 — — 31,000 Depreciation, depletion and amortization — 146,227 6,364 (3,326 ) 149,265 Exploration expenses — 769 — — 769 Impairment — 93 — — 93 General and administrative expenses 7,232 17,678 6,150 (3,120 ) 27,940 Total operating expenses 7,232 356,865 29,630 (32,900 ) 360,827 Operating income (loss) (7,232 ) 90,175 31,791 (1,749 ) 112,985 Other income (expense) Equity in earnings of subsidiaries 32,164 31,529 — (63,693 ) — Net loss on derivative instruments — (71,116 ) — — (71,116 ) Interest expense, net of capitalized interest (32,446 ) (4,438 ) (262 ) — (37,146 ) Other expense — (183 ) — — (183 ) Total other expense (282 ) (44,208 ) (262 ) (63,693 ) (108,445 ) Income (loss) before income taxes (7,514 ) 45,967 31,529 (65,442 ) 4,540 Income tax benefit (expense) 8,104 (8,932 ) — — (828 ) Net income including non-controlling interests 590 37,035 31,529 (65,442 ) 3,712 Less: Net income attributable to non-controlling interests — 3,122 21,574 (21,574 ) 3,122 Net income attributable to Oasis $ 590 $ 33,913 $ 9,955 $ (43,868 ) $ 590
Condensed Consolidating Statement of Cash Flows	Condensed Consolidating Statement of Cash Flows Three Months Ended March 31, 2019 Parent/ Combined Combined Non-guarantor Subsidiaries Intercompany Consolidated (In thousands) Cash flows from operating activities: Net income (loss) including non-controlling interests $ (114,882 ) $ (80,888 ) $ 43,339 $ 44,453 $ (107,978 ) Adjustments to reconcile net income (loss) including non-controlling interests to net cash provided by operating activities: Equity in earnings (loss) of subsidiaries 89,492 (43,339 ) — (46,153 ) — Depreciation, depletion and amortization — 186,069 8,929 (5,165 ) 189,833 Loss on sale of properties — 2,922 — — 2,922 Impairment — 629 — — 629 Deferred income taxes (16,573 ) 13,026 — — (3,547 ) Derivative instruments — 117,611 — — 117,611 Equity-based compensation expenses 8,339 555 119 — 9,013 Deferred financing costs amortization and other 4,058 2,681 191 — 6,930 Working capital and other changes: Change in accounts receivable, net 45,831 (74,291 ) 208 (42,831 ) (71,083 ) Change in inventory — (3,184 ) — — (3,184 ) Change in prepaid expenses (130 ) 1,583 52 — 1,505 Change in accounts payable, interest payable and accrued liabilities (11,909 ) 2,306 3,438 42,831 36,666 Change in other assets and liabilities, net — (4,165 ) (226 ) — (4,391 ) Net cash provided by operating activities 4,226 121,515 56,050 (6,865 ) 174,926 Cash flows from investing activities: Capital expenditures — (187,990 ) (49,458 ) — (237,448 ) Derivative settlements — 13,446 — — 13,446 Net cash used in investing activities — (174,544 ) (49,458 ) — (224,002 ) Cash flows from financing activities: Proceeds from Revolving Credit Facilities — 388,000 32,000 — 420,000 Principal payments on Revolving Credit Facilities — (363,000 ) (5,000 ) — (368,000 ) Deferred financing costs — — (43 ) — (43 ) Purchases of treasury stock (4,261 ) — — — (4,261 ) Distributions to non-controlling interests — 16,985 (21,922 ) — (4,937 ) Investment in subsidiaries / capital contributions from parent — 5,923 (12,788 ) 6,865 — Other — (202 ) (229 ) — (431 ) Net cash provided by (used in) financing activities (4,261 ) 47,706 (7,982 ) 6,865 42,328 Decrease in cash and cash equivalents (35 ) (5,323 ) (1,390 ) — (6,748 ) Cash and cash equivalents at beginning of period 179 15,362 6,649 — 22,190 Cash and cash equivalents at end of period $ 144 $ 10,039 $ 5,259 $ — $ 15,442 Condensed Consolidating Statement of Cash Flows Three Months Ended March 31, 2018 Parent/ Combined Combined Non-guarantor Subsidiaries Intercompany Consolidated (In thousands) Cash flows from operating activities: Net income including non-controlling interests $ 590 $ 37,035 $ 31,529 $ (65,442 ) $ 3,712 Adjustments to reconcile net income including non-controlling interests to net cash provided by operating activities: Equity in earnings of subsidiaries (32,164 ) (31,529 ) — 63,693 — Depreciation, depletion and amortization — 146,227 6,364 (3,326 ) 149,265 Impairment — 93 — — 93 Deferred income taxes (8,104 ) 8,932 — — 828 Derivative instruments — 71,116 — — 71,116 Equity-based compensation expenses 6,418 273 63 — 6,754 Deferred financing costs amortization and other 3,929 1,432 114 — 5,475 Working capital and other changes: Change in accounts receivable, net 51,714 (23,888 ) 36,992 (70,526 ) (5,708 ) Change in inventory — (3,672 ) — — (3,672 ) Change in prepaid expenses (180 ) 641 31 — 492 Change in accounts payable, interest payable and accrued liabilities (12,832 ) (66,000 ) 8,062 70,526 (244 ) Change in other assets and liabilities, net — 248 — — 248 Net cash provided by operating activities 9,371 140,908 83,155 (5,075 ) 228,359 Cash flows from investing activities: Capital expenditures — (169,994 ) (84,844 ) — (254,838 ) Acquisitions — (520,728 ) — — (520,728 ) Derivative settlements — (36,974 ) — — (36,974 ) Other — (28 ) — — (28 ) Net cash used in investing activities — (727,724 ) (84,844 ) — (812,568 ) Cash flows from financing activities: Proceeds from Revolving Credit Facilities — 1,413,000 57,000 — 1,470,000 Principal payments on Revolving Credit Facilities — (857,000 ) (18,000 ) — (875,000 ) Deferred financing costs — (215 ) — — (215 ) Purchases of treasury stock (6,021 ) — — — (6,021 ) Distributions to non-controlling interests — 34,866 (38,316 ) — (3,450 ) Investment in subsidiaries / capital contributions from parent (3,259 ) (5,986 ) 4,170 5,075 — Other (90 ) — — — (90 ) Net cash provided by (used in) financing activities (9,370 ) 584,665 4,854 5,075 585,224 Increase (decrease) in cash and cash equivalents 1 (2,151 ) 3,165 — 1,015 Cash and cash equivalents at beginning of period 178 15,659 883 — 16,720 Cash and cash equivalents at end of period $ 179 $ 13,508 $ 4,048 $ — $ 17,735

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
	Mar. 31, 2019	Mar. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenues	$ 575,732	$ 473,812
Total operating expenses	522,366	360,827
Net income attributable to Oasis	$ (114,882)	$ 590
Basic (in dollars per share)	$ (0.37)	$ 0
Diluted (in dollars per share)	$ (0.37)	$ 0
As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenues		$ 421,216
Total operating expenses		308,231
Net income attributable to Oasis		$ 590
Basic (in dollars per share)		$ 0
Diluted (in dollars per share)		$ 0
Revision
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenues		$ 52,596
Total operating expenses		52,596
Net income attributable to Oasis		$ 0
Basic (in dollars per share)		$ 0
Diluted (in dollars per share)		$ 0
Oil and gas revenues
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenues	$ 368,782	$ 366,595
Oil and gas revenues | As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenues		363,671
Oil and gas revenues | Revision
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenues		2,924
Purchased oil and gas
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenues	148,471	67,709
Purchased oil and gas expenses	$ 149,904	70,594
Purchased oil and gas | As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenues		18,037
Purchased oil and gas expenses		17,998
Purchased oil and gas | Revision
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenues		49,672
Purchased oil and gas expenses		$ 52,596

Oasis Midstream Partners LP (De

Oasis Midstream Partners LP (Details) - USD ($)	Feb. 22, 2019	Mar. 31, 2019	Dec. 31, 2018
2019 Capital Expenditures Arrangement | Oasis Midstream Partners, LP | OMP
Related Party Transaction [Line Items]
Capital contributions under MOU	$ 80,000,000	$ 17,100,000
Bobcat DevCo | OMS Holdings LLC (“OMS”)
Related Party Transaction [Line Items]
Ownership interest (percent)		72.60%	75.00%

Revenue Recognition - Disaggreg

Revenue Recognition - Disaggregated Revenue (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Total revenues	$ 575,732,000	$ 473,812,000
Contract asset	0		$ 0
Contract liability	0		$ 0
Exploration and Production
Disaggregation of Revenue [Line Items]
Total revenues	517,253,000	434,304,000
Midstream Services
Disaggregation of Revenue [Line Items]
Total revenues	106,582,000	64,562,000
Well Services
Disaggregation of Revenue [Line Items]
Total revenues	32,631,000	44,888,000
Operating Segments | Exploration and Production
Disaggregation of Revenue [Line Items]
Total revenues	517,253,000	434,304,000
Operating Segments | Exploration and Production | Crude oil revenues
Disaggregation of Revenue [Line Items]
Total revenues	318,120,000	326,310,000
Operating Segments | Exploration and Production | Purchased crude oil sales
Disaggregation of Revenue [Line Items]
Total revenues	147,136,000	67,660,000
Operating Segments | Exploration and Production | Natural gas revenues
Disaggregation of Revenue [Line Items]
Total revenues	27,452,000	26,962,000
Operating Segments | Exploration and Production | Purchased natural gas sales
Disaggregation of Revenue [Line Items]
Total revenues	1,335,000	49,000
Operating Segments | Exploration and Production | NGL revenues
Disaggregation of Revenue [Line Items]
Total revenues	23,210,000	13,323,000
Operating Segments | Midstream Services
Disaggregation of Revenue [Line Items]
Total revenues	48,021,000	27,922,000
Operating Segments | Midstream Services | Crude oil and natural gas revenues
Disaggregation of Revenue [Line Items]
Total revenues	24,664,000	18,029,000
Operating Segments | Midstream Services | Produced and flowback water revenues
Disaggregation of Revenue [Line Items]
Total revenues	9,033,000	8,876,000
Operating Segments | Midstream Services | Total midstream service revenues
Disaggregation of Revenue [Line Items]
Total revenues	33,697,000	26,905,000
Operating Segments | Midstream Services | Natural gas and NGL revenues
Disaggregation of Revenue [Line Items]
Total revenues	12,797,000	0
Operating Segments | Midstream Services | Freshwater revenues
Disaggregation of Revenue [Line Items]
Total revenues	1,527,000	1,017,000
Operating Segments | Midstream Services | Total midstream product revenues
Disaggregation of Revenue [Line Items]
Total revenues	14,324,000	1,017,000
Operating Segments | Well Services
Disaggregation of Revenue [Line Items]
Total revenues	10,458,000	11,586,000
Operating Segments | Well Services | Hydraulic fracturing revenues
Disaggregation of Revenue [Line Items]
Total revenues	9,775,000	10,426,000
Operating Segments | Well Services | Equipment rental revenues
Disaggregation of Revenue [Line Items]
Total revenues	$ 683,000	$ 1,160,000

Revenue Recognition - Remaining

Revenue Recognition - Remaining Performance Obligation (Details) $ in Thousands	Mar. 31, 2019USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 20,430
Remaining performance obligation satisfaction period	9 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	$ 26,905
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	$ 25,656
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	$ 19,263
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	$ 119,538
Remaining performance obligation satisfaction period

Inventory- Schedule of Inventor

Inventory- Schedule of Inventory (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Inventory
Crude oil inventory	$ 17,542	$ 14,933
Equipment and materials	18,727	18,195
Total inventory	36,269	33,128
Long-term inventory
Linefill in third party pipelines	13,767	12,260
Total long-term inventory	13,767	12,260
Total	$ 50,036	$ 45,388

Accounts Receivable, Net (Detai

Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	$ 458,165	$ 389,128
Allowance for doubtful accounts	(1,526)	(1,526)
Total accounts receivable, net	456,639	387,602
Trade accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	332,889	245,546
Joint interest accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	114,502	133,375
Other accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	$ 10,774	$ 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	Mar. 31, 2019	Dec. 31, 2018
Assets:
Total assets	$ 4,792	$ 107,018
Liabilities:
Total liabilities	28,934	104
Money market funds
Assets:
Total assets	144	143
Commodity derivative instruments
Assets:
Total assets	4,648	106,875
Liabilities:
Total liabilities	28,934	104
Level 1
Assets:
Total assets	144	143
Liabilities:
Total liabilities	0	0
Level 1 | Money market funds
Assets:
Total assets	144	143
Level 1 | Commodity derivative instruments
Assets:
Total assets	0	0
Liabilities:
Total liabilities	0	0
Level 2
Assets:
Total assets	4,648	106,875
Liabilities:
Total liabilities	28,934	104
Level 2 | Money market funds
Assets:
Total assets	0	0
Level 2 | Commodity derivative instruments
Assets:
Total assets	4,648	106,875
Liabilities:
Total liabilities	28,934	104
Level 3
Assets:
Total assets	0	0
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
Liabilities:
Total liabilities	$ 0	$ 0

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Derivative credit risk valuation adjustment, derivative liabilities	$ 0.5
Derivative credit risk valuation adjustment, derivative assets		$ 0.2

Derivative Instruments - Schedu

Derivative Instruments - Schedule of Outstanding Commodity Derivative Instruments (Details) $ in Thousands	1 Months Ended	3 Months Ended
	May 08, 2019MMBTU$ / bblbbl	Mar. 31, 2019USD ($)MMBTU$ / bbl$ / MMBTUbbl
Derivative [Line Items]
Fair value assets (liabilities) | $		$ (24,286)
NYMEX WTI | Crude Oil | 2019 Fixed price swaps
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl		3,881,000
Average swap price (in dollars per barrel)		54.02
Fair value assets (liabilities) | $		$ (23,216)
NYMEX WTI | Crude Oil | 2019 Two-way collar
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl		3,542,000
Average floor price (in dollars per barrel)		57.65
Average ceiling price (in dollars per barrel)		74.72
Fair value assets (liabilities) | $		$ 5,381
NYMEX WTI | Crude Oil | 2019 Three-way collar
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl		3,300,000
Average sub-floor price (in dollars per barrel)		40.37
Average floor price (in dollars per barrel)		51.43
Average ceiling price (in dollars per barrel)		66.81
Fair value assets (liabilities) | $		$ (2,375)
NYMEX WTI | Crude Oil | 2020 Fixed price swaps
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl		829,000
Average swap price (in dollars per barrel)		56.60
Fair value assets (liabilities) | $		$ (2,363)
NYMEX WTI | Crude Oil | 2020 Two-way collar
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl		372,000
Average floor price (in dollars per barrel)		58.08
Average ceiling price (in dollars per barrel)		76.05
Fair value assets (liabilities) | $		$ 1,270
NYMEX WTI | Crude Oil | 2020 Three-way collar
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl		1,712,000
Average sub-floor price (in dollars per barrel)		40
Average floor price (in dollars per barrel)		55.39
Average ceiling price (in dollars per barrel)		61.13
Fair value assets (liabilities) | $		$ (2,081)
NYMEX WTI | Crude Oil | 2021 Three-way collar
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl		124,000
Average sub-floor price (in dollars per barrel)		40
Average floor price (in dollars per barrel)		56.18
Average ceiling price (in dollars per barrel)		60.43
Fair value assets (liabilities) | $		$ (59)
NYMEX WTI | Subsequent Event | Crude Oil | 2019 Fixed price swaps
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl	4,952,000
Average swap price (in dollars per barrel)	56.15
NYMEX WTI | Subsequent Event | Crude Oil | 2019 Two-way collar
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl	3,848,000
Average floor price (in dollars per barrel)	57.68
Average ceiling price (in dollars per barrel)	74.04
NYMEX WTI | Subsequent Event | Crude Oil | 2019 Three-way collar
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl	3,300,000
Average sub-floor price (in dollars per barrel)	40.37
Average floor price (in dollars per barrel)	51.43
Average ceiling price (in dollars per barrel)	66.81
NYMEX WTI | Subsequent Event | Crude Oil | 2020 Fixed price swaps
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl	2,171,000
Average swap price (in dollars per barrel)	59.09
NYMEX WTI | Subsequent Event | Crude Oil | 2020 Two-way collar
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl	434,000
Average floor price (in dollars per barrel)	58.07
Average ceiling price (in dollars per barrel)	74.64
NYMEX WTI | Subsequent Event | Crude Oil | 2020 Three-way collar
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl	3,110,000
Average sub-floor price (in dollars per barrel)	40
Average floor price (in dollars per barrel)	54.79
Average ceiling price (in dollars per barrel)	63.75
NYMEX WTI | Subsequent Event | 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
NYMEX WTI | Subsequent Event | Crude Oil | 2021 Three-way collar
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl	186,000
Average sub-floor price (in dollars per barrel)	40
Average floor price (in dollars per barrel)	54.96
Average ceiling price (in dollars per barrel)	62.31
ICE Brent-NYMEX WTI | Crude Oil | 2019 Basis swaps
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl		244,000
Average swap price (in dollars per barrel)		9.68
Fair value assets (liabilities) | $		$ 549
ICE Brent-NYMEX WTI | Subsequent Event | Crude Oil | 2019 Basis swaps
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl	244,000
ICE Brent-NYMEX WTI | Subsequent Event | Natural Gas | 2019 Basis swaps
Derivative [Line Items]
Average swap price (in dollars per barrel)	9.68
Midland-NYMEX WTI | Crude Oil | 2019 Basis swaps
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl		488,000
Average swap price (in dollars per barrel)		6.71
Fair value assets (liabilities) | $		$ (2,971)
Midland-NYMEX WTI | Subsequent Event | Crude Oil | 2019 Basis swaps
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl	488,000
Midland-NYMEX WTI | Subsequent Event | Natural Gas | 2019 Basis swaps
Derivative [Line Items]
Average swap price (in dollars per barrel)	6.71
Houston NYMEX WTI | Crude Oil | 2019 Basis swaps
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl		549,000
Average swap price (in dollars per barrel)		4.55
Fair value assets (liabilities) | $		$ (305)
Houston NYMEX WTI | Subsequent Event | Crude Oil | 2019 Basis swaps
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl	549,000
Houston NYMEX WTI | Subsequent Event | Natural Gas | 2019 Basis swaps
Derivative [Line Items]
Average swap price (in dollars per barrel)	4.55
NYMEX HH | Natural Gas | 2019 Fixed price swaps
Derivative [Line Items]
Total notional amount of natural gas (in MMBtu) | MMBTU		8,796,000
Average swap price (in dollars per barrel) | $ / MMBTU		2.92
Fair value assets (liabilities) | $		$ 1,148
NYMEX HH | Subsequent Event | Natural Gas | 2019 Fixed price swaps
Derivative [Line Items]
Total notional amount of natural gas (in MMBtu) | MMBTU	8,796,000
Average swap price (in dollars per barrel)	2.92
IF NNG Ventura-NYMEX HH | Natural Gas | 2019 Basis swaps
Derivative [Line Items]
Total notional amount of natural gas (in MMBtu) | MMBTU		2,275,000
Average swap price (in dollars per barrel)		0.02
Fair value assets (liabilities) | $		$ 736
IF NNG Ventura-NYMEX HH | Subsequent Event | Natural Gas | 2019 Basis swaps
Derivative [Line Items]
Total notional amount of natural gas (in MMBtu) | MMBTU	2,275,000
Average swap price (in dollars per barrel)	0.02

Derivative Instruments - Realiz

Derivative Instruments - Realized and Unrealized Gains and Losses from Commodity Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Net loss on derivative instruments	$ (117,611)	$ (71,116)

Derivative Instruments - Sche_2

Derivative Instruments - Schedule of Location and Fair Value of Outstanding Commodity Derivative Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Derivative asset, gross amounts recognized	$ 9,238	$ 118,980
Derivative liability, gross amount recognized	38,474	104
Derivative asset, gross amounts offset	(4,590)	(12,105)
Derivative liability, gross amounts offset	(9,540)	0
Derivative asset, net asset	4,648	106,875
Derivative liability, net liability	28,934	104
Commodity derivative instruments | Current assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amounts recognized	6,734	110,729
Derivative asset, gross amounts offset	(2,267)	(10,799)
Derivative asset, net asset	4,467	99,930
Commodity derivative instruments | Noncurrent assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amounts recognized	2,504	8,251
Derivative asset, gross amounts offset	(2,323)	(1,306)
Derivative asset, net asset	181	6,945
Commodity derivative instruments | Current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	36,599	84
Derivative liability, gross amounts offset	(8,936)	0
Derivative liability, net liability	27,663	84
Commodity derivative instruments | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	1,875	20
Derivative liability, gross amounts offset	(604)	0
Derivative liability, net liability	$ 1,271	$ 20

Property, Plant and Equipment -

Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Proved oil and gas properties	$ 8,039,585	$ 7,878,104
Less: Accumulated depreciation, depletion, amortization and impairment	(3,035,748)	(2,853,353)
Proved oil and gas properties, net	5,003,837	5,024,751
Unproved oil and gas properties	1,033,500	1,034,085
Other property and equipment	1,216,763	1,151,772
Less: Accumulated depreciation	(197,358)	(183,499)
Other property and equipment, net	1,019,405	968,273
Total property, plant and equipment, net	$ 7,056,742	$ 7,027,109

Property, Plant and Equipment P

Property, Plant and Equipment Property, Plant and Equipment - Additional Information (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Proved Oil And Gas Properties
Business Acquisition [Line Items]
Estimate of future asset retirement costs	$ 41.6	$ 40.5
Property, Plant and Equipment, Other Types
Business Acquisition [Line Items]
Estimate of future asset retirement costs	$ 1.4	$ 1.3

Divestitures (Details)

Divestitures (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on sale of properties	$ 2,922	$ 0
Foreman Butte Area
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on sale of properties	$ 2,900

Long-Term Debt - Schedule of Lo

Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total long-term debt	$ 2,791,333	$ 2,735,276
Credit Facility | Revolving Credit Facility | Oasis Credit Facility
Debt Instrument [Line Items]
Total principal of senior unsecured notes and revolving line of credit	493,000	468,000
Credit Facility | Revolving Credit Facility | OMP Credit Facility
Debt Instrument [Line Items]
Total principal of senior unsecured notes and revolving line of credit	345,000	318,000
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	$ (19,692)	(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	(66,384)	$ (69,268)
Total long-term debt	$ 300,000

Long-Term Debt - Additional Inf

Long-Term Debt - Additional Information (Details)	3 Months Ended
	Mar. 31, 2019USD ($)day$ / shares	May 06, 2019USD ($)	Apr. 15, 2019USD ($)	Dec. 31, 2018USD ($)
Debt Instrument [Line Items]
Total long-term debt	$ 2,791,333,000			$ 2,735,276,000
Ownership percentage, guarantors (as percent)	100.00%
Unsecured Senior Notes
Debt Instrument [Line Items]
Long-term debt, fair value	$ 2,008,600,000
Amended Credit Facility
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity	843,000,000
Swingline Loan | The Credit Agreement
Debt Instrument [Line Items]
Credit facility borrowing base	10,000,000
Credit Facility | Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding	14,000,000
Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility amount	$ 3,000,000,000
Weighted average interest rate (as percent)	4.20%
Credit Facility | Revolving Credit Facility | Oasis Credit Facility
Debt Instrument [Line Items]
Long-term debt, gross	$ 493,000,000			468,000,000
Weighted average interest rate (as percent)	4.20%
Credit Facility | Revolving Credit Facility | OMP Credit Facility
Debt Instrument [Line Items]
Long-term debt, gross	$ 345,000,000			318,000,000
Credit facility borrowing base	400,000,000
Line of credit facility, remaining borrowing capacity	55,000,000
Senior Notes
Debt Instrument [Line Items]
Debt issuance costs	19,692,000			20,865,000
Long-term debt, gross	2,039,409,000			2,039,409,000
Senior Notes | 2022 and 2023 Notes
Debt Instrument [Line Items]
Total long-term debt	1,267,600,000
Senior Notes | Notes [Member]
Debt Instrument [Line Items]
Unsecured debt	$ 1,739,400,000
Senior Notes | Notes [Member] | Minimum
Debt Instrument [Line Items]
Stated interest rate (as percent)	6.25%
Senior Notes | Notes [Member] | Maximum
Debt Instrument [Line Items]
Stated interest rate (as percent)	6.875%
Senior Notes | 6.50% senior unsecured notes due November 1, 2021
Debt Instrument [Line Items]
Long-term debt, gross	$ 71,835,000			71,835,000
Stated interest rate (as percent)	6.50%
Senior Notes | 6.875% senior unsecured notes due March 15, 2022
Debt Instrument [Line Items]
Long-term debt, gross	$ 901,480,000			901,480,000
Stated interest rate (as percent)	6.875%
Senior Notes | 6.875% senior unsecured notes due January 15, 2023
Debt Instrument [Line Items]
Long-term debt, gross	$ 366,094,000			366,094,000
Stated interest rate (as percent)	6.875%
Senior Notes | 2.625% senior unsecured convertible notes due September 15, 2023
Debt Instrument [Line Items]
Total long-term debt	$ 300,000,000
Debt discount	66,384,000			69,268,000
Long-term debt, gross	$ 300,000,000			$ 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)	0.0763650
Debt conversion price (in dollars per share) | $ / shares	$ 13.10
Revolving Credit Facility | LIBOR | Minimum
Debt Instrument [Line Items]
Commitment fee percentage	0.375%
Revolving Credit Facility | LIBOR | Maximum
Debt Instrument [Line Items]
Commitment fee percentage	0.50%
Debt Conversion Scenario 1 | Senior Notes | 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%
Debt Conversion Scenario 2 | Senior Notes | 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%
OMP Operating, LLC | Letter of Credit
Debt Instrument [Line Items]
Credit facility borrowing base	$ 10,000,000
OMP Operating, LLC | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity subject to certain conditions	$ 600,000,000
OMP Operating, LLC | Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Commitment fee percentage	0.375%
OMP Operating, LLC | Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Commitment fee percentage	0.50%
OMP Operating, LLC | ABR Loans | Revolving Credit Facility | Federal Funds Effective Swap Rate
Debt Instrument [Line Items]
Spread on variable rate	0.50%
OMP Operating, LLC | ABR Loans | Revolving Credit Facility | LIBOR
Debt Instrument [Line Items]
Spread on variable rate	1.00%
OMP Operating, LLC | Eurodollar Loans | Revolving Credit Facility | LIBOR | Minimum
Debt Instrument [Line Items]
Spread on variable rate	1.75%
OMP Operating, LLC | Eurodollar Loans | Revolving Credit Facility | LIBOR | Maximum
Debt Instrument [Line Items]
Spread on variable rate	2.75%
OMP Operating, LLC | ABR Loans or Swingline Loans | Revolving Credit Facility | Federal Funds Effective Swap Rate | Minimum
Debt Instrument [Line Items]
Spread on variable rate	0.75%
OMP Operating, LLC | ABR Loans or Swingline Loans | Revolving Credit Facility | Federal Funds Effective Swap Rate | Maximum
Debt Instrument [Line Items]
Spread on variable rate	1.75%
OMP Operating, LLC | ABR Loans or Swingline Loans | Revolving Credit Facility | LIBOR | Minimum
Debt Instrument [Line Items]
Spread on variable rate	0.75%
OMP Operating, LLC | ABR Loans or Swingline Loans | Revolving Credit Facility | LIBOR | Maximum
Debt Instrument [Line Items]
Spread on variable rate	1.75%
Subsequent Event | Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility borrowing base			$ 1,600,000,000
Line of credit facility, current borrowing capacity			1,350,000,000
Subsequent Event | Credit Facility | Revolving Credit Facility | OMP Credit Facility
Debt Instrument [Line Items]
Credit facility borrowing base		$ 475,000,000
Maximum borrowing capacity subject to certain conditions		$ 675,000,000
Subsequent Event | Swingline Loan | Revolving Credit Facility
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	3 Months Ended
	Mar. 31, 2019USD ($)
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
December 31, 2018	$ 52,449
Liabilities incurred during period	405
Liabilities settled during period	(72)
Accretion expense during period	718
Liabilities held for sale	827
March 31, 2019	$ 54,327

Asset Retirement Obligations _2

Asset Retirement Obligations - Additional Information (Details) $ in Millions	Mar. 31, 2019USD ($)
Asset Retirement Obligation Disclosure [Abstract]
Total asset retirement obligations, current portion	$ 0.9

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Effective tax rate (as percent)	3.30%	18.20%
Pre-tax income (loss)	$ (111,681)	$ 4,540

Equity-Based Compensation - Add

Equity-Based Compensation - Additional Information (Details) $ / shares in Units, $ in Thousands	Oct. 19, 2017	Mar. 31, 2019USD ($)day$ / sharesshares	Mar. 31, 2018USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expenses | $		$ 9,013	$ 6,754
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		3 years
Stock granted (in shares) | shares		4,030,475
Granted, weighted average grant date fair value per unit (in usd per share) | $ / shares		$ 6.62
Equity-based compensation expenses | $		$ 6,400	4,800
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	1,900
Right to received shares of common stock (in shares) | shares		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]
Stock granted (in shares) | shares		341,290
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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 | $		$ 700	100
Vesting period	3 years
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
Vesting period		1 year

Equity-Based Compensation - Sum

Equity-Based Compensation - Summary of Assumptions (Details) - Performance Share Units	3 Months Ended
	Mar. 31, 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
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Basic weighted average common shares outstanding (in shares)	314,464	290,105
Diluted weighted average common shares outstanding (in shares)	314,464	291,738
Restricted Stock Awards and PSUs
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	1,633

Earnings (Loss) Per Share - S_2

Earnings (Loss) Per Share - Schedule of Common Shares Excluded from Diluted Earnings (Loss) per Share (Details) - shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive stock-based compensation awards (in shares)	9,800,000	5,281,000
Unvested Stock Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive stock-based compensation awards (in shares)	0

Business Segment Information -

Business Segment Information - Additional Information (Details)	3 Months Ended
	Mar. 31, 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
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total revenues	$ 575,732	$ 473,812
Operating income	50,444	112,985
Other income (expense)	(162,125)	(108,445)
Income (loss) before income taxes	(111,681)	4,540
General and administrative	34,459	27,940
Equity-based compensation	9,013	6,754
Property, plant and equipment, net	7,056,742		$ 7,027,109
Total assets	7,646,346		7,626,142
Exploration and Production
Segment Reporting Information [Line Items]
Total revenues	517,253	434,304
Midstream Services
Segment Reporting Information [Line Items]
Total revenues	106,582	64,562
Well Services
Segment Reporting Information [Line Items]
Total revenues	32,631	44,888
Operating Segments | Exploration and Production
Segment Reporting Information [Line Items]
Total revenues	517,253	434,304
Operating income	1,924	79,962
Other income (expense)	(158,382)	(108,146)
Income (loss) before income taxes	(156,458)	(28,184)
General and administrative	27,527	23,478
Equity-based compensation	8,580	6,454
Property, plant and equipment, net	6,292,206		6,311,566
Total assets	6,795,467		6,838,987
Operating Segments | Midstream Services
Segment Reporting Information [Line Items]
Total revenues	48,021	27,922
Operating income	49,806	32,237
Other income (expense)	(3,748)	(258)
Income (loss) before income taxes	46,058	31,979
General and administrative	8,861	6,414
Equity-based compensation	465	370
Property, plant and equipment, net	949,100		893,285
Total assets	1,915,729		920,619
Operating Segments | Well Services
Segment Reporting Information [Line Items]
Total revenues	10,458	11,586
Operating income	815	8,148
Other income (expense)	5	(41)
Income (loss) before income taxes	820	8,107
General and administrative	7,461	5,891
Equity-based compensation	561	385
Property, plant and equipment, net	34,150		38,871
Total assets	(96,226)		48,150
Inter-segment | Exploration and Production
Segment Reporting Information [Line Items]
Total revenues	0	0
Inter-segment | Midstream Services
Segment Reporting Information [Line Items]
Total revenues	58,561	36,640
Inter-segment | Well Services
Segment Reporting Information [Line Items]
Total revenues	22,173	33,302
Eliminations
Segment Reporting Information [Line Items]
Total revenues	(80,734)	(69,942)
Operating income	(2,101)	(7,362)
Other income (expense)	0	0
Income (loss) before income taxes	(2,101)	(7,362)
General and administrative	(9,390)	(7,843)
Equity-based compensation	(593)	$ (455)
Property, plant and equipment, net	(218,714)		(216,613)
Total assets	$ (968,624)		$ (181,614)

Leases - Narrative (Details)

Leases - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Operating lease assets	$ 24,741
Operating lease liabilities	30,742
Finance lease ROU assets	6,855
Finance lease liabilities	6,831
Finance lease ROU assets accumulated amortization	$ 600
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) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Lease, Cost [Abstract]
Operating lease costs	$ 11,676
Variable lease costs	1,040
Short-term lease costs	463
Finance lease costs:
Amortization of ROU assets	566
Interest on lease liabilities	55
Total finance lease costs	621
Total lease costs	$ 13,800

Leases - Maturities of the Comp

Leases - Maturities of the Company's lease liabilities (Details) $ in Thousands	Mar. 31, 2019USD ($)
Operating Leases
2019 (excluding the three months ended March 31, 2019)	$ 12,804
2020	3,643
2021	1,140
2022	2,297
2023	2,345
Thereafter	12,801
Total future lease payments	35,030
Less: Imputed interest	4,288
Present value of future lease payments	30,742
Finance Leases
2019 (excluding the three months ended March 31, 2019)	1,880
2020	2,495
2021	1,658
2022	888
2023	63
Thereafter	361
Total future lease payments	7,345
Less: Imputed interest	514
Present value of future lease payments	$ 6,831

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	Mar. 31, 2019USD ($)
Leases [Abstract]
Operating right-of-use assets	$ 24,741
Finance lease assets	6,855
Total lease assets	31,596
Operating lease liabilities, current	13,135
Finance lease liabilities, current	2,485
Operating lease liabilities, noncurrent	17,610
Finance lease liabilities, noncurrent	4,530
Total lease liabilities	$ 37,760

Leases - Schedule of supplement

Leases - Schedule of supplemental cash flow information and non-cash transactions related to Company's leases (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Leases [Abstract]
Operating cash flows from operating leases	$ 4,671
Operating cash flows from finance leases	55
Financing cash flows from finance leases	256
Right-of-use assets obtained in exchange for operating lease obligations	5,029
Right-of-use assets obtained in exchange for finance lease obligations	$ 1,433

Leases - Weighted-average remai

Leases - Weighted-average remaining lease term and discount rate for the Company’s leases (Details)	Mar. 31, 2019
Leases [Abstract]
Weighted average remaining lease term - operating leases	6 years 3 months 15 days
Weighted average discount rate (percent) - operating leases	3.90%
Weighted average remaining lease term - finance leases	3 years 9 months 3 days
Weighted average discount rate (percent) - finance leases	3.60%

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) bbl in Millions, Mcf in Millions	Mar. 23, 2017USD ($)	Mar. 31, 2019USD ($)bblMcf
Loss Contingencies [Line Items]
Required delivery time-frame under volume commitments time frame agreements		10 years
Estimable future commitments under agreements | $		$ 677,200,000
Mirada Litigation [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Damages sought (in excess of) | $	$ 100,000,000
Crude Oil
Loss Contingencies [Line Items]
Minimum quantity to be delivered or transported		53.1
Natural Gas Liquids [Member]
Loss Contingencies [Line Items]
Minimum quantity to be delivered or transported		41.3
Natural Gas
Loss Contingencies [Line Items]
Minimum quantity to be delivered or transported | Mcf		908.2
Produced Water [Member]
Loss Contingencies [Line Items]
Minimum quantity to be delivered or transported		36.8

Condensed Consolidating Finan_3

Condensed Consolidating Financial Information - Additional Information (Details)	3 Months Ended
	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Ownership percentage, guarantors (as percent)	100.00%

Condensed Consolidating Finan_4

Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 15,442	$ 22,190
Accounts receivable, net	456,639	387,602
Accounts receivable - affiliates	0	0
Inventory	36,269	33,128
Prepaid expenses	8,404	10,997
Derivative instruments	4,467	99,930
Intangible assets, net	0	125
Other current assets	309	183
Total current assets	521,530	554,155
Property, plant and equipment
Oil and gas properties (successful efforts method)	9,073,085	8,912,189
Other property and equipment	1,216,763	1,151,772
Less: accumulated depreciation, depletion, amortization and impairment	(3,233,106)	(3,036,852)
Total property, plant and equipment, net	7,056,742	7,027,109
Investments in and advances to subsidiaries	0	0
Derivative instruments	181	6,945
Deferred income taxes	0	0
Long-term inventory	13,767	12,260
Operating right-of-use assets	24,741
Other assets	29,385	25,673
Total assets	7,646,346	7,626,142
Current liabilities
Accounts payable	10,172	20,166
Accounts payable - affiliates	0	0
Revenues and production taxes payable	249,569	216,695
Accrued liabilities	338,819	331,651
Accrued interest payable	21,931	38,040
Derivative instruments	27,663	84
Advances from joint interest partners	5,072	5,140
Current operating lease liabilities	13,135
Other current liabilities	2,485	0
Total current liabilities	668,846	611,776
Long-term debt	2,791,333	2,735,276
Deferred income taxes	296,508	300,055
Asset retirement obligations	53,404	52,384
Derivative instruments	1,271	20
Operating lease liabilities	17,610
Other liabilities	6,239	7,751
Total liabilities	3,835,211	3,707,262
Stockholders’ equity
Capital contributions from affiliates	0	0
Common stock, $0.01 par value: 450,000,000 shares authorized; 320,010,501 shares issued and 317,987,427 shares outstanding at June 30, 2018 and 270,627,014 shares issued and 269,295,466 shares outstanding at December 31, 2017	3,182	3,157
Treasury stock, at cost: 2,023,074 and 1,331,548 shares at June 30, 2018 and December 31, 2017, respectively	(33,286)	(29,025)
Additional paid-in capital	3,087,083	3,077,755
Retained earnings	567,807	682,689
Oasis share of stockholders’ equity	3,624,786	3,734,576
Non-controlling interests	186,349	184,304
Total stockholders’ equity	3,811,135	3,918,880	$ 3,886,158	$ 3,513,579
Total liabilities and stockholders’ equity	7,646,346	7,626,142
Intercompany Eliminations
Current assets
Cash and cash equivalents	0	0
Accounts receivable, net	0	0
Accounts receivable - affiliates	(757,483)	(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	(757,483)	(800,314)
Property, plant and equipment
Oil and gas properties (successful efforts method)	(12,801)	(11,102)
Other property and equipment	0	0
Less: accumulated depreciation, depletion, amortization and impairment	0	0
Total property, plant and equipment, net	(12,801)	(11,102)
Investments in and advances to subsidiaries	(5,198,255)	(5,277,252)
Derivative instruments	0	0
Deferred income taxes	(236,242)	(219,670)
Long-term inventory	0	0
Operating right-of-use assets	0
Other assets	0	0
Total assets	(6,204,781)	(6,308,338)
Current liabilities
Accounts payable	0	0
Accounts payable - affiliates	(757,483)	(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	(757,483)	(800,314)
Long-term debt	0	0
Deferred income taxes	(236,242)	(219,670)
Asset retirement obligations	0	0
Derivative instruments	0	0
Operating lease liabilities	0
Other liabilities	0	0
Total liabilities	(993,725)	(1,019,984)
Stockholders’ equity
Capital contributions from affiliates	(3,390,752)	(3,403,886)
Common stock, $0.01 par value: 450,000,000 shares authorized; 320,010,501 shares issued and 317,987,427 shares outstanding at June 30, 2018 and 270,627,014 shares issued and 269,295,466 shares outstanding at December 31, 2017	0	0
Treasury stock, at cost: 2,023,074 and 1,331,548 shares at June 30, 2018 and December 31, 2017, respectively	0	0
Additional paid-in capital	(8,743)	(8,743)
Retained earnings	(1,499,317)	(1,562,910)
Oasis share of stockholders’ equity	(4,898,812)	(4,975,539)
Non-controlling interests	(312,244)	(312,815)
Total stockholders’ equity	(5,211,056)	(5,288,354)
Total liabilities and stockholders’ equity	(6,204,781)	(6,308,338)
Parent/ Issuer
Current assets
Cash and cash equivalents	144	179
Accounts receivable, net	0	0
Accounts receivable - affiliates	597,551	643,382
Inventory	0	0
Prepaid expenses	503	373
Derivative instruments	0	0
Intangible assets, net		0
Other current assets	0	0
Total current assets	598,198	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
Investments in and advances to subsidiaries	4,824,586	4,910,111
Derivative instruments	0	0
Deferred income taxes	236,242	219,670
Long-term inventory	0	0
Operating right-of-use assets	0
Other assets	0	0
Total assets	5,659,026	5,773,715
Current liabilities
Accounts payable	0	0
Accounts payable - affiliates	47,402	43,113
Revenues and production taxes payable	0	0
Accrued liabilities	211	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	68,371	80,280
Long-term debt	1,953,333	1,949,276
Deferred income taxes	0	0
Asset retirement obligations	0	0
Derivative instruments	0	0
Operating lease liabilities	0
Other liabilities	0	0
Total liabilities	2,021,704	2,029,556
Stockholders’ equity
Capital contributions from affiliates	0	0
Common stock, $0.01 par value: 450,000,000 shares authorized; 320,010,501 shares issued and 317,987,427 shares outstanding at June 30, 2018 and 270,627,014 shares issued and 269,295,466 shares outstanding at December 31, 2017	3,182	3,157
Treasury stock, at cost: 2,023,074 and 1,331,548 shares at June 30, 2018 and December 31, 2017, respectively	(33,286)	(29,025)
Additional paid-in capital	3,087,592	3,078,203
Retained earnings	579,834	691,824
Oasis share of stockholders’ equity	3,637,322	3,744,159
Non-controlling interests	0	0
Total stockholders’ equity	3,637,322	3,744,159
Total liabilities and stockholders’ equity	5,659,026	5,773,715
Combined Guarantor Subsidiaries
Current assets
Cash and cash equivalents	10,039	15,362
Accounts receivable, net	453,220	385,121
Accounts receivable - affiliates	80,273	76,127
Inventory	35,997	33,106
Prepaid expenses	6,535	9,206
Derivative instruments	4,467	99,930
Intangible assets, net		125
Other current assets	309	183
Total current assets	590,840	619,160
Property, plant and equipment
Oil and gas properties (successful efforts method)	9,085,886	8,923,291
Other property and equipment	233,131	218,617
Less: accumulated depreciation, depletion, amortization and impairment	(3,161,469)	(2,974,122)
Total property, plant and equipment, net	6,157,548	6,167,786
Investments in and advances to subsidiaries	373,669	367,141
Derivative instruments	181	6,945
Deferred income taxes	0	0
Long-term inventory	13,767	12,260
Operating right-of-use assets	21,639
Other assets	26,705	23,221
Total assets	7,184,349	7,196,513
Current liabilities
Accounts payable	10,024	18,567
Accounts payable - affiliates	677,210	724,187
Revenues and production taxes payable	249,160	216,114
Accrued liabilities	274,910	273,923
Accrued interest payable	549	502
Derivative instruments	27,663	84
Advances from joint interest partners	5,072	5,140
Current operating lease liabilities	10,796
Other current liabilities	2,469
Total current liabilities	1,257,853	1,238,517
Long-term debt	493,000	468,000
Deferred income taxes	532,750	519,725
Asset retirement obligations	51,871	50,870
Derivative instruments	1,271	20
Operating lease liabilities	16,825
Other liabilities	5,928	7,751
Total liabilities	2,359,498	2,284,883
Stockholders’ equity
Capital contributions from affiliates	3,225,865	3,226,837
Common stock, $0.01 par value: 450,000,000 shares authorized; 320,010,501 shares issued and 317,987,427 shares outstanding at June 30, 2018 and 270,627,014 shares issued and 269,295,466 shares outstanding at December 31, 2017	0	0
Treasury stock, at cost: 2,023,074 and 1,331,548 shares at June 30, 2018 and December 31, 2017, respectively	0	0
Additional paid-in capital	8,234	8,295
Retained earnings	1,404,403	1,492,194
Oasis share of stockholders’ equity	4,638,502	4,727,326
Non-controlling interests	186,349	184,304
Total stockholders’ equity	4,824,851	4,911,630
Total liabilities and stockholders’ equity	7,184,349	7,196,513
Combined Non-guarantor Subsidiaries
Current assets
Cash and cash equivalents	5,259	6,649
Accounts receivable, net	3,419	2,481
Accounts receivable - affiliates	79,659	80,805
Inventory	272	22
Prepaid expenses	1,366	1,418
Derivative instruments	0	0
Intangible assets, net		0
Other current assets	0	0
Total current assets	89,975	91,375
Property, plant and equipment
Oil and gas properties (successful efforts method)	0	0
Other property and equipment	983,632	933,155
Less: accumulated depreciation, depletion, amortization and impairment	(71,637)	(62,730)
Total property, plant and equipment, net	911,995	870,425
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	3,102
Other assets	2,680	2,452
Total assets	1,007,752	964,252
Current liabilities
Accounts payable	148	1,599
Accounts payable - affiliates	32,871	33,014
Revenues and production taxes payable	409	581
Accrued liabilities	63,698	57,657
Accrued interest payable	624	442
Derivative instruments	0	0
Advances from joint interest partners	0	0
Current operating lease liabilities	2,339
Other current liabilities	16
Total current liabilities	100,105	93,293
Long-term debt	345,000	318,000
Deferred income taxes	0	0
Asset retirement obligations	1,533	1,514
Derivative instruments	0	0
Operating lease liabilities	785
Other liabilities	311	0
Total liabilities	447,734	412,807
Stockholders’ equity
Capital contributions from affiliates	164,887	177,049
Common stock, $0.01 par value: 450,000,000 shares authorized; 320,010,501 shares issued and 317,987,427 shares outstanding at June 30, 2018 and 270,627,014 shares issued and 269,295,466 shares outstanding at December 31, 2017	0	0
Treasury stock, at cost: 2,023,074 and 1,331,548 shares at June 30, 2018 and December 31, 2017, respectively	0	0
Additional paid-in capital	0	0
Retained earnings	82,887	61,581
Oasis share of stockholders’ equity	247,774	238,630
Non-controlling interests	312,244	312,815
Total stockholders’ equity	560,018	551,445
Total liabilities and stockholders’ equity	$ 1,007,752	$ 964,252

Condensed Consolidating Finan_5

Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Balance Sheet - Additional Information (Details) - $ / shares	Mar. 31, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	900,000,000	900,000,000
Common stock, shares issued (in shares)	324,829,258	320,469,049
Common stock, shares outstanding (in shares)	322,051,268	318,377,161
Treasury stock, shares (in shares)	2,777,990	2,091,888

Condensed Consolidating Finan_6

Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues
Total revenues	$ 575,732	$ 473,812
Operating expenses
Lease operating expenses	58,444	44,781
Marketing, transportation and gathering expenses	34,950	21,013
Production taxes	29,618	31,000
Depreciation, depletion and amortization	189,833	149,265
Exploration expenses	830	769
Impairment	629	93
General and administrative expenses	34,459	27,940
Total operating expenses	522,366	360,827
Loss on sale of properties	(2,922)	0
Operating income	50,444	112,985
Other income (expense)
Equity In Earnings In Subsidiaries	0	0
Net loss on derivative instruments	(117,611)	(71,116)
Interest expense, net of capitalized interest	(44,468)	(37,146)
Other income (expense)	(46)	(183)
Total other expense	(162,125)	(108,445)
Income (loss) before income taxes	(111,681)	4,540
Income tax benefit (expense)	3,703	(828)
Net income (loss) including non-controlling interests	(107,978)	3,712
Less: Net income attributable to non-controlling interests	6,904	3,122
Net income (loss) attributable to Oasis	(114,882)	590
Intercompany Eliminations
Revenues
Total revenues	(46,700)	(34,649)
Operating expenses
Lease operating expenses	(13,341)	(10,918)
Marketing, transportation and gathering expenses	(10,287)	(5,659)
Production taxes	0	0
Depreciation, depletion and amortization	(5,165)	(3,326)
Exploration expenses	0	0
Impairment	0	0
General and administrative expenses	(4,173)	(3,120)
Total operating expenses	(45,000)	(32,900)
Loss on sale of properties	0
Operating income	(1,700)	(1,749)
Other income (expense)
Equity In Earnings In Subsidiaries	46,153	(63,693)
Net loss on derivative instruments	0	0
Interest expense, net of capitalized interest	0	0
Other income (expense)	0	0
Total other expense	46,153	(63,693)
Income (loss) before income taxes	44,453	(65,442)
Income tax benefit (expense)	0	0
Net income (loss) including non-controlling interests	44,453	(65,442)
Less: Net income attributable to non-controlling interests	(21,796)	(21,574)
Net income (loss) attributable to Oasis	66,249	(43,868)
Parent/ Issuer
Revenues
Total revenues	0	0
Operating expenses
Lease operating expenses	0	0
Marketing, transportation and gathering expenses	0	0
Production taxes	0	0
Depreciation, depletion and amortization	0	0
Exploration expenses	0	0
Impairment	0	0
General and administrative expenses	9,087	7,232
Total operating expenses	9,087	7,232
Loss on sale of properties	0
Operating income	(9,087)	(7,232)
Other income (expense)
Equity In Earnings In Subsidiaries	(89,492)	32,164
Net loss on derivative instruments	0	0
Interest expense, net of capitalized interest	(32,876)	(32,446)
Other income (expense)	0	0
Total other expense	(122,368)	(282)
Income (loss) before income taxes	(131,455)	(7,514)
Income tax benefit (expense)	16,573	8,104
Net income (loss) including non-controlling interests	(114,882)	590
Less: Net income attributable to non-controlling interests	0	0
Net income (loss) attributable to Oasis	(114,882)	590
Combined Guarantor Subsidiaries
Revenues
Total revenues	530,781	447,040
Operating expenses
Lease operating expenses	71,785	55,699
Marketing, transportation and gathering expenses	45,237	26,672
Production taxes	29,618	31,000
Depreciation, depletion and amortization	186,069	146,227
Exploration expenses	830	769
Impairment	629	93
General and administrative expenses	20,825	17,678
Total operating expenses	513,715	356,865
Loss on sale of properties	(2,922)
Operating income	14,144	90,175
Other income (expense)
Equity In Earnings In Subsidiaries	43,339	31,529
Net loss on derivative instruments	(117,611)	(71,116)
Interest expense, net of capitalized interest	(7,844)	(4,438)
Other income (expense)	(46)	(183)
Total other expense	(82,162)	(44,208)
Income (loss) before income taxes	(68,018)	45,967
Income tax benefit (expense)	(12,870)	(8,932)
Net income (loss) including non-controlling interests	(80,888)	37,035
Less: Net income attributable to non-controlling interests	6,904	3,122
Net income (loss) attributable to Oasis	(87,792)	33,913
Combined Non-guarantor Subsidiaries
Revenues
Total revenues	91,651	61,421
Operating expenses
Lease operating expenses	0	0
Marketing, transportation and gathering expenses	0	0
Production taxes	0	0
Depreciation, depletion and amortization	8,929	6,364
Exploration expenses	0	0
Impairment	0	0
General and administrative expenses	8,720	6,150
Total operating expenses	44,564	29,630
Loss on sale of properties	0
Operating income	47,087	31,791
Other income (expense)
Equity In Earnings In Subsidiaries	0	0
Net loss on derivative instruments	0	0
Interest expense, net of capitalized interest	(3,748)	(262)
Other income (expense)	0	0
Total other expense	(3,748)	(262)
Income (loss) before income taxes	43,339	31,529
Income tax benefit (expense)	0	0
Net income (loss) including non-controlling interests	43,339	31,529
Less: Net income attributable to non-controlling interests	21,796	21,574
Net income (loss) attributable to Oasis	21,543	9,955
Oil and gas revenues
Revenues
Total revenues	368,782	366,595
Oil and gas revenues | Intercompany Eliminations
Revenues
Total revenues	0	0
Oil and gas revenues | Parent/ Issuer
Revenues
Total revenues	0	0
Oil and gas revenues | Combined Guarantor Subsidiaries
Revenues
Total revenues	368,782	366,595
Oil and gas revenues | Combined Non-guarantor Subsidiaries
Revenues
Total revenues	0	0
Purchased oil and gas
Revenues
Total revenues	148,471	67,709
Operating expenses
Expenses	149,904	70,594
Purchased oil and gas | Intercompany Eliminations
Revenues
Total revenues	0	0
Operating expenses
Expenses	0	0
Purchased oil and gas | Parent/ Issuer
Revenues
Total revenues	0	0
Operating expenses
Expenses	0	0
Purchased oil and gas | Combined Guarantor Subsidiaries
Revenues
Total revenues	148,471	67,709
Operating expenses
Expenses	149,904	70,594
Purchased oil and gas | Combined Non-guarantor Subsidiaries
Revenues
Total revenues	0	0
Operating expenses
Expenses	0	0
Midstream Services
Revenues
Total revenues	48,021	27,922
Operating expenses
Expenses	16,729	7,985
Midstream Services | Intercompany Eliminations
Revenues
Total revenues	(46,700)	(34,649)
Operating expenses
Expenses	(12,034)	(9,877)
Midstream Services | Parent/ Issuer
Revenues
Total revenues	0	0
Operating expenses
Expenses	0	0
Midstream Services | Combined Guarantor Subsidiaries
Revenues
Total revenues	3,070	1,150
Operating expenses
Expenses	1,848	746
Midstream Services | Combined Non-guarantor Subsidiaries
Revenues
Total revenues	91,651	61,421
Operating expenses
Expenses	26,915	17,116
Well Services
Revenues
Total revenues	10,458	11,586
Operating expenses
Expenses	6,970	7,387
Well Services | Intercompany Eliminations
Revenues
Total revenues	0	0
Operating expenses
Expenses	0	0
Well Services | Parent/ Issuer
Revenues
Total revenues	0	0
Operating expenses
Expenses	0	0
Well Services | Combined Guarantor Subsidiaries
Revenues
Total revenues	10,458	11,586
Operating expenses
Expenses	6,970	7,387
Well Services | Combined Non-guarantor Subsidiaries
Revenues
Total revenues	0	0
Operating expenses
Expenses	$ 0	$ 0

Condensed Consolidating Finan_7

Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Statement of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income (loss) including non-controlling interests	$ (107,978)	$ 3,712
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
Depreciation, depletion and amortization	189,833	149,265
Loss on sale of properties	2,922	0
Impairment	629	93
Deferred income taxes	(3,547)	828
Derivative instruments	117,611	71,116
Equity-based compensation expenses	9,013	6,754
Deferred financing costs amortization and other	6,930	5,475
Working capital and other changes:
Change in accounts receivable, net	(71,083)	(5,708)
Change in inventory	(3,184)	(3,672)
Change in prepaid expenses	1,505	492
Change in accounts payable, interest payable and accrued liabilities	36,666	(244)
Change in other assets and liabilities, net	(4,391)	248
Net cash provided by operating activities	174,926	228,359
Cash flows from investing activities:
Capital expenditures	(237,448)	(254,838)
Acquisitions	0	(520,728)
Derivative settlements	13,446
Derivative settlements		(36,974)
Other	0	(28)
Net cash used in investing activities	(224,002)	(812,568)
Cash flows from financing activities:
Proceeds from Revolving Credit Facilities	420,000	1,470,000
Principal payments on revolving credit facility	(368,000)	(875,000)
Deferred financing costs	(43)	(215)
Purchases of treasury stock	(4,261)	(6,021)
Distributions to non-controlling interests	(4,937)	(3,450)
Investment in / capital contributions from subsidiaries	0	0
Other	(431)	(90)
Net cash provided by financing activities	42,328	585,224
Increase (decrease) in cash and cash equivalents	(6,748)	1,015
Beginning of period	22,190	16,720
End of period	15,442	17,735
Intercompany Eliminations
Cash flows from operating activities:
Net income (loss) including non-controlling interests	44,453	(65,442)
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	(46,153)	63,693
Depreciation, depletion and amortization	(5,165)	(3,326)
Loss on sale of properties	0
Impairment	0	0
Deferred income taxes	0	0
Derivative instruments	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	(42,831)	(70,526)
Change in inventory	0	0
Change in prepaid expenses	0	0
Change in accounts payable, interest payable and accrued liabilities	42,831	70,526
Change in other assets and liabilities, net	0	0
Net cash provided by operating activities	(6,865)	(5,075)
Cash flows from investing activities:
Capital expenditures	0	0
Acquisitions		0
Derivative settlements	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
Deferred financing costs	0	0
Purchases of treasury stock	0	0
Distributions to non-controlling interests	0	0
Investment in / capital contributions from subsidiaries	6,865	5,075
Other	0	0
Net cash provided by financing activities	6,865	5,075
Increase (decrease) in cash and cash equivalents	0	0
Beginning of period	0	0
End of period	0	0
Parent/ Issuer
Cash flows from operating activities:
Net income (loss) including non-controlling interests	(114,882)	590
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	89,492	(32,164)
Depreciation, depletion and amortization	0	0
Loss on sale of properties	0
Impairment	0	0
Deferred income taxes	(16,573)	(8,104)
Derivative instruments	0	0
Equity-based compensation expenses	8,339	6,418
Deferred financing costs amortization and other	4,058	3,929
Working capital and other changes:
Change in accounts receivable, net	45,831	51,714
Change in inventory	0	0
Change in prepaid expenses	(130)	(180)
Change in accounts payable, interest payable and accrued liabilities	(11,909)	(12,832)
Change in other assets and liabilities, net	0	0
Net cash provided by operating activities	4,226	9,371
Cash flows from investing activities:
Capital expenditures	0	0
Acquisitions		0
Derivative settlements	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
Deferred financing costs	0	0
Purchases of treasury stock	(4,261)	(6,021)
Distributions to non-controlling interests	0	0
Investment in / capital contributions from subsidiaries	0	(3,259)
Other	0	(90)
Net cash provided by financing activities	(4,261)	(9,370)
Increase (decrease) in cash and cash equivalents	(35)	1
Beginning of period	179	178
End of period	144	179
Combined Guarantor Subsidiaries
Cash flows from operating activities:
Net income (loss) including non-controlling interests	(80,888)	37,035
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	(43,339)	(31,529)
Depreciation, depletion and amortization	186,069	146,227
Loss on sale of properties	2,922
Impairment	629	93
Deferred income taxes	13,026	8,932
Derivative instruments	117,611	71,116
Equity-based compensation expenses	555	273
Deferred financing costs amortization and other	2,681	1,432
Working capital and other changes:
Change in accounts receivable, net	(74,291)	(23,888)
Change in inventory	(3,184)	(3,672)
Change in prepaid expenses	1,583	641
Change in accounts payable, interest payable and accrued liabilities	2,306	(66,000)
Change in other assets and liabilities, net	(4,165)	248
Net cash provided by operating activities	121,515	140,908
Cash flows from investing activities:
Capital expenditures	(187,990)	(169,994)
Acquisitions		(520,728)
Derivative settlements	13,446
Derivative settlements		(36,974)
Other		(28)
Net cash used in investing activities	(174,544)	(727,724)
Cash flows from financing activities:
Proceeds from Revolving Credit Facilities	388,000	1,413,000
Principal payments on revolving credit facility	(363,000)	(857,000)
Deferred financing costs	0	(215)
Purchases of treasury stock	0	0
Distributions to non-controlling interests	16,985	34,866
Investment in / capital contributions from subsidiaries	5,923	(5,986)
Other	(202)	0
Net cash provided by financing activities	47,706	584,665
Increase (decrease) in cash and cash equivalents	(5,323)	(2,151)
Beginning of period	15,362	15,659
End of period	10,039	13,508
Combined Non-guarantor Subsidiaries
Cash flows from operating activities:
Net income (loss) including non-controlling interests	43,339	31,529
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
Depreciation, depletion and amortization	8,929	6,364
Loss on sale of properties	0
Impairment	0	0
Deferred income taxes	0	0
Derivative instruments	0	0
Equity-based compensation expenses	119	63
Deferred financing costs amortization and other	191	114
Working capital and other changes:
Change in accounts receivable, net	208	36,992
Change in inventory	0	0
Change in prepaid expenses	52	31
Change in accounts payable, interest payable and accrued liabilities	3,438	8,062
Change in other assets and liabilities, net	(226)	0
Net cash provided by operating activities	56,050	83,155
Cash flows from investing activities:
Capital expenditures	(49,458)	(84,844)
Acquisitions		0
Derivative settlements	0
Derivative settlements		0
Other		0
Net cash used in investing activities	(49,458)	(84,844)
Cash flows from financing activities:
Proceeds from Revolving Credit Facilities	32,000	57,000
Principal payments on revolving credit facility	(5,000)	(18,000)
Deferred financing costs	(43)	0
Purchases of treasury stock	0	0
Distributions to non-controlling interests	(21,922)	(38,316)
Investment in / capital contributions from subsidiaries	(12,788)	4,170
Other	(229)	0
Net cash provided by financing activities	(7,982)	4,854
Increase (decrease) in cash and cash equivalents	(1,390)	3,165
Beginning of period	6,649	883
End of period	$ 5,259	$ 4,048