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, 2015	$ (1,244,289)	$ 2,145	$ 3,054,211	$ (53,863)	$ (4,244,967)	$ (1,815)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
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
Total comprehensive income | Predecessor	1,242,190				1,242,081	109
Ending Balance (Predecessor) at Oct. 01, 2016	0	0	0	0	0	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of successor equity	687,483	250	687,233
Employee stock-based compensation expense	1,032		1,032
Warrants exercised	159		159
Total comprehensive income	57,903				33,449	24,454
Ending Balance at Dec. 31, 2016	746,577	250	688,424		33,449	24,454
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends on common shares	(24,667)				(24,667)
Employee stock-based compensation expense	10,437		10,437
Issuance of 17,233 shares of common stock under long-term incentive plan	1,244		1,244
Warrants exercised	20		20
Purchase of common stock under share repurchase program	(302,109)			(302,109)
Total comprehensive income	234,363		0		238,450	(4,087)
Ending Balance at Dec. 31, 2017	665,865	250	700,125	(302,109)	247,232	20,367
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends on common shares	(32,143)		0		(32,143)
Employee stock-based compensation expense	17,519		17,519
Warrants exercised	9		9
Purchase of common stock under share repurchase program	(281,774)			(281,774)
Retirement of 1,968 shares for payment of employee taxes upon vesting	(161)		(161)
Total comprehensive income	335,506				312,577	22,929
Ending Balance at Dec. 31, 2018	$ 704,821	$ 250	$ 717,492	$ (583,883)	$ 527,666	$ 43,296