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	(861,940)			(861,940)
Stock-based compensation, net of tax	1,219	$ 3	1,540		$ (324)
Stock-based compensation, net of tax, shares		325,280			85,131
Net loss on derivative financial instruments	(1)					(1)
Ending Balance at Mar. 31, 2020	2,371,488	$ 1,451	2,025,887	550,261	$ (206,092)	$ (19)
Ending Balance, shares at Mar. 31, 2020		145,107,046			7,162,987
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	(361,681)			(361,681)
Ending Balance at Mar. 31, 2021	$ 1,620,885	$ 1,453	$ 2,029,979	$ (204,384)	$ (206,163)
Ending Balance, shares at Mar. 31, 2021		145,263,865			7,209,554