Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-In-Capital	Additional Paid-In-Capital Cumulative Effect, Period of Adoption, Adjustment	Treasury Stock	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2019	$ 2,261,332	$ (1,609)	$ 7	$ 379,380		$ (72,455)	$ 1,955,187	$ (1,609)	$ (787)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	3,790			3,790
Repurchase of common stock	(1,536)					(1,536)
Proceeds from options exercised	16			16
Changes in comprehensive income	226								226
Net loss	(27,828)						(27,828)
Ending balance at Mar. 31, 2020	2,234,391		7	383,186		(73,991)	1,925,750		(561)
Beginning balance at Dec. 31, 2019	2,261,332	(1,609)	7	379,380		(72,455)	1,955,187	(1,609)	(787)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(172,256)
Ending balance at Jun. 30, 2020	2,343,162		27	636,317		(74,009)	1,781,322		(495)
Beginning balance at Dec. 31, 2019	2,261,332	(1,609)	7	379,380		(72,455)	1,955,187	(1,609)	(787)
Ending balance at Dec. 31, 2020	$ 2,249,695	(49,530)	10	799,549	$ (55,590)	(74,124)	1,524,878	6,060	(618)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Beginning balance at Mar. 31, 2020	$ 2,234,391		7	383,186		(73,991)	1,925,750		(561)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock and warrants, net	194,886		20	194,866
Share-based compensation	2,652			2,652
Repurchase of common stock	(18)					(18)
Proceeds from options exercised	23			23
Changes in comprehensive income	66								66
Equity component value of convertible debt issuance, net	55,590			55,590
Net loss	(144,428)						(144,428)
Ending balance at Jun. 30, 2020	2,343,162		27	636,317		(74,009)	1,781,322		(495)
Beginning balance at Dec. 31, 2020	2,249,695	(49,530)	10	799,549	(55,590)	(74,124)	1,524,878	6,060	(618)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	4,254			4,254
Repurchase of common stock	(1,307)					(1,307)
Changes in comprehensive income	52								52
Issuance of warrants	2,146			2,146
Net loss	(112,321)						(112,321)
Ending balance at Mar. 31, 2021	$ 2,092,989		10	750,359		(75,431)	1,418,617		(566)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]
Beginning balance at Dec. 31, 2020	$ 2,249,695	$ (49,530)	10	799,549	$ (55,590)	(74,124)	1,524,878	$ 6,060	(618)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(400,184)
Ending balance at Jun. 30, 2021	2,180,807		11	1,126,031		(75,448)	1,130,754		(541)
Beginning balance at Mar. 31, 2021	2,092,989		10	750,359		(75,431)	1,418,617		(566)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock and warrants, net	373,187		1	373,186
Share-based compensation	2,486			2,486
Repurchase of common stock	(17)					(17)
Changes in comprehensive income	25								25
Net loss	(287,863)						(287,863)
Ending balance at Jun. 30, 2021	$ 2,180,807		$ 11	$ 1,126,031		$ (75,448)	$ 1,130,754		$ (541)