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) (Predecessor) at Dec. 31, 2015	1,404,309	1,404,309
Balance at beginning of period (Predecessor) at Dec. 31, 2015	$ (620,357)	$ 14	$ 431,307		$ (1,051,678)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock forfeited (in shares) | Predecessor		(9,006)
Restricted stock repurchased (in shares) | Predecessor	(2,597)	(2,597)
Stock-based compensation | Predecessor	$ (6,076)		(6,076)
Restricted stock canceled (in shares) | Predecessor	(9,006)
Net income (loss) | Predecessor	$ (415,720)				(415,720)
Balance at end of period (in shares) (Predecessor) at Dec. 31, 2016	1,392,706	1,392,706
Balance at end of period (Predecessor) 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) | Predecessor	(1,454)	(1,454)
Stock-based compensation | Predecessor	$ 194		194
Restricted stock canceled (in shares) | Predecessor	(8,964)	(8,964)
Net income (loss) | Predecessor	$ 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
Balance at beginning of period (in shares) (Predecessor) at Dec. 31, 2016	1,392,706	1,392,706
Balance at beginning of period (Predecessor) at Dec. 31, 2016	$ (1,042,153)	$ 14	425,231		(1,467,398)
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)
Balance at beginning of period (in shares) (Predecessor) at Mar. 21, 2017	1,382,288	1,382,288
Balance at beginning of period (in shares) at Mar. 21, 2017	44,982,142	44,982,142
Balance at beginning of period (Predecessor) at Mar. 21, 2017	$ (1,012,089)	$ 14	425,425		(425,439)
Balance at beginning 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 income (loss)	$ (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 income (loss)	$ 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)