Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Common Stock	Paid-in Capital	Treasury Stock, at cost	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Income (Loss)
Beginning Balance (Predecessor) at Dec. 31, 2014	$ 1,668,154	$ 2,141	$ 3,048,460	$ (53,863)	$ (1,331,825)	$ 3,241
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss) | Predecessor	(2,918,198)				(2,913,142)	(5,056)
Issuance of 64 shares of common stock under the stock incentive plan-restricted stock and restricted stock units, net of forfeitures | Predecessor	(5)	4	(9)
Employee stock-based compensation expense | Predecessor	5,760		5,760
Ending Balance (Predecessor) at Dec. 31, 2015	(1,244,289)	2,145	3,054,211	(53,863)	(4,244,967)	(1,815)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss) | Predecessor	1,242,190	0	0		1,242,081	109
Employee stock-based compensation expense | Predecessor	2,099		2,099
Elimination of predecessor equity | Predecessor	0	(2,145)	(3,056,310)	53,863	3,002,886	1,706
Ending Balance (Predecessor) at Oct. 01, 2016	0	0	0	0	0	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	57,903				33,449	24,454
Employee stock-based compensation expense	1,032		1,032
Issuance of successor equity	687,483	250	687,233
Warrants exercised	159		159
Ending Balance at Dec. 31, 2016	746,577	250	688,424	0	33,449	24,454
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	234,363				238,450	(4,087)
Issuance of 64 shares of common stock under the stock incentive plan-restricted stock and restricted stock units, net of forfeitures	1,244		1,244
Employee stock-based compensation expense	10,437		10,437
Dividends on common shares ($0.35/share)	(24,667)				(24,667)
Warrants exercised	20		20
Purchase of 3,977,215 shares of common stock under share repurchase program	(302,109)			(302,109)
Ending Balance at Dec. 31, 2017	$ 665,865	$ 250	$ 700,125	$ (302,109)	$ 247,232	$ 20,367