CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Common stock held in treasury	Additional paid-in capital	Retained deficit	Accumulated other comprehensive loss
Beginning balance at Dec. 31, 2019	$ 2,347,488	$ 2,514	$ (7,236)	$ 5,659,832	$ (3,306,834)	$ (788)
Beginning balance Shares at Dec. 31, 2019		251,439,000
Issuance of common stock	(1,364)	$ 42		(1,406)
Issuance of common stock, shares		4,246,000
Stock-based compensation expense	5,963			5,963
Treasury stock	(22,547)		(22,514)	(33)
Other comprehensive income	73					73
Net income	166,195				166,195
Ending balance at Mar. 31, 2020	2,495,808	$ 2,556	(29,750)	5,664,356	(3,140,639)	(715)
Ending balance Shares at Mar. 31, 2020		255,685,000
Beginning balance at Dec. 31, 2019	2,347,488	$ 2,514	(7,236)	5,659,832	(3,306,834)	(788)
Beginning balance Shares at Dec. 31, 2019		251,439,000
Ending balance at Dec. 31, 2020	$ 1,637,535	$ 2,563	(30,132)	5,684,268	(4,018,685)	(479)
Ending balance Shares at Dec. 31, 2020	256,353,887	256,354,000
Issuance of common stock	$ (7,621)	$ 33		(7,654)
Issuance of common stock, shares		3,218,000
Issuance of common stock upon vesting of PSUs				148	(148)
Stock-based compensation expense	6,713			6,713
Treasury stock			47	(47)
Other comprehensive income	70					70
Net income	27,151				27,151
Ending balance at Mar. 31, 2021	$ 1,663,848	$ 2,596	$ (30,085)	$ 5,683,428	$ (3,991,682)	$ (409)
Ending balance Shares at Mar. 31, 2021	259,595,233	259,572,000