Consolidated Statements of Shareholders’ Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-In Capital	Treasury Stock	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2017	$ 1,762,574		$ 7	$ 360,153	$ (65,854)	$ 1,469,732		$ (1,464)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201602Member
Share-based compensation	$ 11,021			11,021
Repurchase of common stock	(1,162)				(1,162)
Proceeds from options exercised	51			51
Changes in comprehensive income	271							271
Net income (loss)	155,749					155,749
Ending balance at Dec. 31, 2018	$ 1,928,504	$ (5,549)	7	371,225	(67,016)	1,625,481	$ (5,549)	(1,193)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Share-based compensation	$ 8,154			8,154
Repurchase of common stock	(5,439)				(5,439)
Proceeds from options exercised	1			1
Changes in comprehensive income	406							406
Net income (loss)	335,255					335,255
Ending balance at Dec. 31, 2019	2,261,332		7	379,380	(72,455)	1,955,187		(787)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	11,575			11,575
Repurchase of common stock	(1,669)				(1,669)
Proceeds from options exercised	39			39
Changes in comprehensive income	169							169
Issuance of Common Stock and Warrants, net	352,968		3	352,965
Equity component value of convertible debt issuance, net	55,590			55,590
Net income (loss)	(428,700)					(428,700)
Ending balance at Dec. 31, 2020	$ 2,249,695	$ (1,609)	$ 10	$ 799,549	$ (74,124)	$ 1,524,878	$ (1,609)	$ (618)