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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:      
Net income (loss) including non-controlling interests $ (19,500) $ 127,446 $ (243,016)
Adjustments to reconcile net income (loss) including non-controlling interests to net cash provided by operating activities:      
Depreciation, depletion and amortization 636,296 530,802 476,331
(Gain) loss on extinguishment of debt 13,848 0 (4,741)
(Gain) loss on sale of properties (28,587) (1,774) 1,303
Impairment 384,228 6,887 4,684
Deferred income taxes (5,866) (202,884) (128,538)
Derivative instruments (28,457) 71,657 105,317
Equity-based compensation expenses 29,273 26,534 24,103
Deferred financing costs amortization and other 29,057 18,311 14,334
Working capital and other changes:      
Change in accounts receivable, net (23,508) (166,386) (11,923)
Change in inventory (14,346) (2,501) 254
Change in prepaid expenses (2,354) (838) (295)
Change in other current assets 10 148 (305)
Change in long-term inventory and other assets (144) (12,143) (151)
Change in accounts payable, interest payable and accrued liabilities 26,116 123,107 (13,839)
Change in other current liabilities (40) (10,450) 4,490
Change in other liabilities 395 (40) 10
Net cash provided by operating activities 996,421 507,876 228,018
Cash flows from investing activities:      
Capital expenditures (1,148,961) (647,349) (426,256)
Acquisitions (581,650) (61,874) (781,522)
Proceeds from sale of properties 333,229 5,774 12,333
Costs related to sale of properties (2,850) (366) (310)
Derivative settlements (213,528) (8,264)  
Derivative settlements     121,977
Advances from joint interest partners 224   2,950
Advances from joint interest partners   (2,681)  
Net cash used in investing activities (1,613,536) (714,760) (1,070,828)
Cash flows from financing activities:      
Proceeds from Revolving Credit Facilities 3,224,000 1,162,000 1,407,000
Principal payments on revolving credit facility (2,586,000) (1,377,000) (1,182,000)
Repurchase of senior unsecured notes (423,340) 0 (435,907)
Proceeds from issuance of senior unsecured notes 400,000 0 300,000
Deferred financing costs (13,862) (2,714) (9,127)
Proceeds from sale of common stock, net of offering costs 0 302,191 766,670
Proceeds from sale of Oasis Midstream common units, net of offering costs 44,503 134,185 0
Purchases of treasury stock (6,846) (6,229) (2,330)
Distributions to non-controlling interests (14,114) 0 0
Other (1,756) (55) 0
Net cash provided by financing activities 622,585 212,378 844,306
Increase in cash and cash equivalents 5,470 5,494 1,496
Cash and cash equivalents:      
Beginning of period 16,720 11,226 9,730
End of period 22,190 16,720 11,226
Supplemental cash flow information:      
Cash paid for interest, net of capitalized interest 141,196 129,463 138,248
Cash paid for income taxes 38 12 0
Cash received for income tax refunds 25 281 5
Supplemental non-cash transactions:      
Change in accrued capital expenditures 68,946 83,508 (43,415)
Change in asset retirement obligations 3,880 (789) 3,810
Note receivable from divestiture 0 0 4,000
Installment notes from acquisition 0 4,875 0
Issuance of shares in connection with the Permian Basin Acquisition $ 371,220 $ 0 $ 0