Consolidated statements of stockholders' equity (deficit) - USD ($) $ in Thousands	Total	Common stock outstanding	Additional paid in capital	Treasury stock	Accumulated deficit
Balance at beginning of period (in shares) at Dec. 31, 2016	1,392,706	1,392,706
Balance at beginning of period at Dec. 31, 2016	$ (1,042,153)	$ 14	$ 425,231		$ (1,467,398)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock forfeited (in shares)	(1,454)	(1,454)
Stock-based compensation	$ 194		194
Restricted stock canceled (in shares)	(8,964)	(8,964)
Net (loss) income	$ 1,041,959				1,041,959
Balance at end of period (in shares) (Predecessor) at Mar. 21, 2017	1,382,288	1,382,288
Balance at end of period (in shares) at Mar. 21, 2017	44,982,142	44,982,142
Balance at end of period (Predecessor) at Mar. 21, 2017	$ (1,012,089)	$ 14	425,425		(425,439)
Balance at end of period at Mar. 21, 2017	$ 949,063	$ 450	948,613
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation (in shares)	1,853,236	1,853,236
Stock-based compensation	$ 12,605	$ 18	12,587
Restricted stock canceled (in shares)	(7,616)	(7,616)
Net (loss) income	$ (118,902)				(118,902)
Balance at end of period (in shares) at Dec. 31, 2017	46,827,762	46,827,762
Balance at end of period at Dec. 31, 2017	$ 842,766	$ 468	961,200	$ 0	(118,902)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock forfeited (in shares)	(231,746)	(231,746)
Restricted stock forfeited	$ (2)	$ (2)
Repurchase of common stock (in shares)	(261,103)	(261,103)
Repurchase of common stock	$ (4,936)			(4,936)
Stock-based compensation (in shares)		55,600
Stock-based compensation	13,417	$ 1	13,416
Net (loss) income	$ 33,442				33,442
Balance at end of period (in shares) at Dec. 31, 2018	46,390,513	46,390,513
Balance at end of period at Dec. 31, 2018	$ 884,687	$ 467	974,616	(4,936)	(85,460)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock forfeited (in shares)	(316,821)	(316,821)
Restricted stock forfeited	$ (3)	$ (3)
Repurchase of common stock (in shares)	(209,852)	(209,852)
Repurchase of common stock	$ (1,174)			(1,174)
Stock-based compensation (in shares)	2,002,173	2,002,173
Stock-based compensation	$ 2,265	$ 20	2,245
Issuance of Successor common stock - settlement of claims (in shares)	76,217	76,217
Issuance of Successor common stock - settlement of claims and litigation	$ 324	$ 1	323
Cash settlement of stock based awards	(10)		(10)
Net (loss) income	$ (468,948)				(468,948)
Balance at end of period (in shares) at Dec. 31, 2019	47,942,230	47,942,230
Balance at end of period at Dec. 31, 2019	$ 417,141	$ 485	$ 977,174	$ (6,110)	$ (554,408)