Condensed Consolidated Statement of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues
Total revenues	$ 546,448	$ 304,748	$ 1,469,001	$ 843,955
Operating expenses
Lease operating expenses	48,534	45,334	137,456	133,871
Marketing, transportation and gathering expenses	30,713	15,028	74,559	38,018
Production taxes	38,722	21,052	103,748	60,322
Depreciation, depletion and amortization	162,984	132,289	465,819	384,246
Exploration expenses	22,315	854	23,701	4,010
Impairment	0	139	384,228	6,021
General and administrative expenses	34,859	21,368	91,029	67,170
Total operating expenses	404,272	272,354	1,458,468	786,090
Gain on sale of properties	36,869	0	38,823	0
Operating income	179,045	32,394	49,356	57,865
Other income (expense)
Net gain (loss) on derivative instruments	(48,544)	(54,310)	(239,945)	52,297
Interest expense, net of capitalized interest	(39,560)	(37,389)	(117,616)	(110,548)
Loss on extinguishment of debt	(47)	0	(13,698)	0
Other income (expense)	111	(605)	146	(755)
Total other expense	(88,040)	(92,304)	(371,113)	(59,006)
Income (loss) before income taxes	91,005	(59,910)	(321,757)	(1,141)
Income tax benefit (expense)	(24,782)	18,846	75,391	470
Net income (loss) including non-controlling interests	66,223	(41,064)	(246,366)	(671)
Less: Net income attributable to non-controlling interests	3,882	150	10,907	150
Net income (loss) attributable to Oasis	$ 62,341	$ (41,214)	$ (257,273)	$ (821)
Earnings (loss) attributable to Oasis per share:
Basic (in dollars per share)	$ 0.20	$ (0.18)	$ (0.84)	$ 0.00
Diluted (in dollars per share)	$ 0.20	$ (0.18)	$ (0.84)	$ 0.00
Weighted average shares outstanding:
Basic (in shares)	313,167	233,389	305,533	233,248
Diluted (in shares)	316,387	233,389	305,533	233,248
Oil and Gas [Member]
Revenues
Total revenues	$ 452,643	$ 248,648	$ 1,212,235	$ 704,533
Purchased Oil and Gas Sales [Member]
Revenues
Total revenues	46,356	21,195	121,971	56,917
Operating expenses
Expenses	46,088	21,701	121,251	57,683
Midstream Services [Member]
Revenues
Total revenues	31,187	18,767	88,451	48,939
Operating expenses
Expenses	8,652	4,301	24,325	10,891
Well Services [Member]
Revenues
Total revenues	16,262	16,138	46,344	33,566
Operating expenses
Expenses	$ 11,405	$ 10,288	$ 32,352	$ 23,858