Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Stock [Member]	Additional Paid-in-Capital	Retained Earnings (Deficit) [Member]	Non-controlling Interests [Member]
Beginning Balance at Dec. 31, 2014	$ 1,872,301	$ 1,001	$ (10,671)	$ 1,007,202	$ 874,769
Beginning Balance (shares) at Dec. 31, 2014		101,342	286
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock	462,833	$ 368		462,465
Issuance of common stock (shares)		36,800
Equity-based compensation	27,405	$ 7		27,398
Equity-based compensation (shares)		1,156
Treasury stock - tax withholdings	(2,949)		$ (2,949)
Treasury stock - tax withholdings (shares)		222	222
Net income (loss) including non-controlling interests	(40,248)				(40,248)
Beginning Balance at Dec. 31, 2015	2,319,342	$ 1,376	$ (13,620)	1,497,065	834,521
Ending Balance (shares) at Dec. 31, 2015		139,076	508
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock	766,670	$ 943		765,727
Issuance of common stock (shares)		94,300
Equity-based compensation	25,771	$ 12		25,759
Equity-based compensation (shares)		3,317
Equity component of senior unsecured convertible notes, net	56,720			56,720
Treasury stock - tax withholdings	(2,330)		$ (2,330)
Treasury stock - tax withholdings (shares)		349	349
Net income (loss) including non-controlling interests	(243,016)				(243,016)
Beginning Balance at Dec. 31, 2016	2,923,157	$ 2,331	$ (15,950)	2,345,271	591,505
Ending Balance (shares) at Dec. 31, 2016		236,344	857
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative-effect adjustment for adoption of ASU 2016-09	4,724			2,040	2,684
Fees (2016 issuance of common stock)	(55)			(55)
Issuance of common stock	302,191	$ 320		301,871
Issuance of common stock (shares)		32,000
Equity-based compensation	28,160	$ 17		28,090		$ 53
Equity-based compensation (shares)		1,426
Issuance of Oasis Midstream common units, net of offering costs	134,185					134,185
Treasury stock - tax withholdings	(6,229)		$ (6,229)
Treasury stock - tax withholdings (shares)		475	475
Net income (loss) including non-controlling interests	127,446				123,796	3,650
Beginning Balance at Dec. 31, 2017	$ 3,513,579	$ 2,668	$ (22,179)	$ 2,677,217	$ 717,985	$ 137,888
Ending Balance (shares) at Dec. 31, 2017		269,295	1,332