Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net income (loss) including non-controlling interests	$ 127,446	$ (243,016)	$ (40,248)
Adjustments to reconcile net income (loss) including non-controlling interests to net cash provided by operating activities:
Depreciation, depletion and amortization	530,802	476,331	485,322
Gain on extinguishment of debt	0	(4,741)	0
(Gain) loss on sale of properties	(1,774)	1,303	0
Impairment	6,887	4,684	46,109
Deferred income taxes	(202,884)	(128,538)	(16,114)
Derivative instruments	71,657	105,317	(210,376)
Equity-based compensation expenses	26,534	24,103	25,272
Deferred financing costs amortization and other	18,311	14,334	12,299
Working capital and other changes:
Change in accounts receivable, net	(158,587)	(11,923)	108,461
Change in inventory	(2,501)	254	6,873
Change in prepaid expenses	(838)	(295)	1,828
Change in other current assets	148	(305)	6,489
Change in long-term inventory and other assets	(12,143)	(151)	(950)
Change in accounts payable, interest payable and accrued liabilities	115,308	(13,839)	(71,617)
Change in other current liabilities	(10,450)	4,490	6,500
Change in other liabilities	(40)	10	(33)
Net cash provided by operating activities	507,876	228,018	359,815
Cash flows from investing activities:
Capital expenditures	(647,349)	(426,256)	(819,847)
Acquisitions	(61,874)	(781,522)	(28,817)
Proceeds from sale of properties	5,774	12,333	1,075
Costs related to sale of properties	(366)	(310)	0
Derivative settlements	(8,264)	121,977	370,410
Advances from joint interest partners	(2,681)	2,950	(1,969)
Net cash used in investing activities	(714,760)	(1,070,828)	(479,148)
Cash flows from financing activities:
Proceeds from Revolving Credit Facilities	1,162,000	1,407,000	630,000
Principal payments on revolving credit facility	(1,377,000)	(1,182,000)	(992,000)
Repurchase of senior unsecured notes	0	(435,907)	0
Proceeds from issuance of senior unsecured convertible notes	0	300,000	0
Deferred financing costs	(2,714)	(9,127)	(14,632)
Proceeds from sale of common stock	302,191	766,670	462,833
Proceeds from sale of Oasis Midstream common units, net of offering costs	134,185	0	0
Purchases of treasury stock	(6,229)	(2,330)	(2,949)
Other	(55)	0	0
Net cash provided by financing activities	212,378	844,306	83,252
Increase (decrease) in cash and cash equivalents	5,494	1,496	(36,081)
Cash and cash equivalents:
Beginning of period	11,226	9,730	45,811
End of period	16,720	11,226	9,730
Supplemental cash flow information:
Cash paid for interest, net of capitalized interest	154,980	138,248	145,333
Cash paid for taxes	12	0	0
Cash received for income tax refunds	281	5	5,548
Supplemental non-cash transactions:
Change in accrued capital expenditures	83,508	(43,415)	(260,060)
Change in asset retirement obligations	(789)	3,810	3,972
Note receivable from divestiture	0	4,000	0
Installment notes from acquisition	$ 4,875	$ 0	$ 0