Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Gains (Losses) [Member]
Beginning Balance at Dec. 31, 2019	$ 3,232,210	$ 1,448	$ 2,024,347	$ 1,412,201	$ (205,768)	$ (18)
Beginning Balance, shares at Dec. 31, 2019		144,782,000			7,078,000
Net loss	(1,105,366)			(1,105,366)
Stock-based compensation, net of tax	5,242	$ 5	5,632		$ (395)
Stock-based compensation, net of tax, shares		482			132
Net gain on derivative financial instruments	18					18
Ending Balance at Sep. 30, 2020	2,132,104	$ 1,453	2,029,979	306,835	$ (206,163)
Ending Balance, shares at Sep. 30, 2020		145,264,000			7,210,000
Beginning Balance at Jun. 30, 2020	2,230,689	$ 1,453	2,029,978	405,441	$ (206,162)	(21)
Beginning Balance, shares at Jun. 30, 2020		145,259,000			7,208,000
Net loss	(98,606)			(98,606)
Stock-based compensation, net of tax			1		$ (1)
Stock-based compensation, net of tax, shares		5			2
Net gain on derivative financial instruments	21					$ 21
Ending Balance at Sep. 30, 2020	2,132,104	$ 1,453	2,029,979	306,835	$ (206,163)
Ending Balance, shares at Sep. 30, 2020		145,264,000			7,210,000
Beginning Balance at Dec. 31, 2020	1,982,566	$ 1,453	2,029,979	157,297	$ (206,163)
Beginning Balance, shares at Dec. 31, 2020		145,264,000			7,210,000
Net loss	(1,961,989)			(1,961,989)
Cancellation of Predecessor equity	(20,577)	$ (1,453)	(2,029,979)	1,804,692	$ 206,163
Cancellation of Predecessor equity, shares		(145,264,000)			(7,210,000)
Ending Balance at Apr. 23, 2021	934,810
Ending Balance, shares at Apr. 23, 2021
Ending Balance at Apr. 23, 2021
Issuance of Successor equity	934,810	$ 10	934,800
Issuance of Successor equity, shares		100,000,000
Ending Balance at Apr. 24, 2021	934,810	$ 10	934,800
Ending Balance, shares at Apr. 24, 2021		100,000,000
Beginning Balance at Apr. 23, 2021	934,810
Beginning Balance, shares at Apr. 23, 2021
Net loss	(52,475)			(52,475)
Stock-based compensation, net of tax	5,486		5,486
Stock-based compensation, net of tax, shares		75,000
Ending Balance at Sep. 30, 2021	887,821	$ 10	940,286	(52,475)
Ending Balance, shares at Sep. 30, 2021		100,075,000
Beginning Balance at Jun. 30, 2021	888,509	$ 10	935,792	(47,293)
Beginning Balance, shares at Jun. 30, 2021		100,075,000
Net loss	(5,182)			(5,182)
Stock-based compensation, net of tax	4,494		4,494
Ending Balance at Sep. 30, 2021	$ 887,821	$ 10	$ 940,286	$ (52,475)
Ending Balance, shares at Sep. 30, 2021		100,075,000