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		144,781,766			7,077,856
Net loss	(1,006,760)			(1,006,760)
Stock-based compensation, net of tax	5,242	$ 5	5,631		$ (394)
Stock-based compensation, net of tax, shares		476,770			130,333
Net loss on derivative financial instruments	(3)					(3)
Ending Balance at Jun. 30, 2020	2,230,689	$ 1,453	2,029,978	405,441	$ (206,162)	(21)
Ending Balance, shares at Jun. 30, 2020		145,258,536			7,208,189
Beginning Balance at Mar. 31, 2020	2,371,488	$ 1,451	2,025,887	550,261	$ (206,092)	(19)
Beginning Balance, shares at Mar. 31, 2020		145,107,046			7,162,987
Net loss	(144,820)			(144,820)
Stock-based compensation, net of tax	4,023	$ 2	4,091		$ (70)
Stock-based compensation, net of tax, shares		151,490			45,202
Net loss on derivative financial instruments	(2)					(2)
Ending Balance at Jun. 30, 2020	2,230,689	$ 1,453	2,029,978	405,441	$ (206,162)	$ (21)
Ending Balance, shares at Jun. 30, 2020		145,258,536			7,208,189
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		145,263,865			7,209,554
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		(145,263,865)			(7,209,554)
Ending Balance at Apr. 23, 2021
Ending Balance, shares at Apr. 23, 2021
Beginning Balance at Mar. 31, 2021	1,620,885	$ 1,453	2,029,979	(204,384)	$ (206,163)
Beginning Balance, shares at Mar. 31, 2021		145,263,865			7,209,554
Net loss	(1,600,308)			(1,600,308)
Cancellation of Predecessor equity	(20,577)	$ (1,453)	(2,029,979)	1,804,692	$ 206,163
Cancellation of Predecessor equity, shares		(145,263,865)			(7,209,554)
Ending Balance at Apr. 23, 2021
Ending Balance, shares at Apr. 23, 2021
Issuance of Successor equity	934,810	$ 10	934,800
Issuance of Successor equity, shares		100,000,019
Ending Balance at Apr. 24, 2021	934,810	$ 10	934,800
Ending Balance, shares at Apr. 24, 2021		100,000,019
Beginning Balance at Apr. 23, 2021
Beginning Balance, shares at Apr. 23, 2021
Net loss	(47,293)
Ending Balance at Jun. 30, 2021	888,509	$ 10	935,792	(47,293)
Ending Balance, shares at Jun. 30, 2021		100,074,093
Beginning Balance at Apr. 24, 2021	934,810	$ 10	934,800
Beginning Balance, shares at Apr. 24, 2021		100,000,019
Net loss	(47,293)			(47,293)
Stock-based compensation, net of tax	992		992
Stock-based compensation, net of tax, shares		74,074
Ending Balance at Jun. 30, 2021	$ 888,509	$ 10	$ 935,792	$ (47,293)
Ending Balance, shares at Jun. 30, 2021		100,074,093