Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Paid-in Capital	Treasury Stock, at cost	Retained Earnings Accumulated Income	Accumulated Other Comprehensive Income (Loss)	Total
Beginning Balance at Dec. 31, 2018	$ 250	$ 717,492	$ (583,883)	$ 527,666	$ 43,296	$ 704,821
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends on common shares				(30,040)		(30,040)
Employee stock-based compensation		21,989				21,989
Issuance of shares of common stock under long-term incentive plan	2					2
Common stock withheld related to net share settlement of equity awards		(8,962)				(8,962)
Warrants exercised		32				32
Purchase of common stock under share repurchase program			(243,498)			(243,498)
Total comprehensive income (loss)				233,799	(37,607)	196,192
Ending Balance at Dec. 31, 2019	252	730,551	(827,381)	731,425	5,689	640,536
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends on common shares				(7,904)		(7,904)
Employee stock-based compensation		17,435				17,435
Common stock withheld related to net share settlement of equity awards	1	(2,196)				(2,195)
Issuance of Convertible Debt, net of fees		39,237				39,237
Purchase of capped call related to convertible debt		(17,543)				(17,543)
Total comprehensive income (loss)				(344,615)	(41,390)	(386,005)
Ending Balance at Dec. 31, 2020	253	767,484	(827,381)	378,906	(35,701)	283,561
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends on common shares				(4,001)		(4,001)
Employee stock-based compensation		20,539				20,539
Issuance of shares of common stock under long-term incentive plan	2					2
Common stock withheld related to net share settlement of equity awards		(4,842)				(4,842)
Warrants exercised		1,175				1,175
Total comprehensive income (loss)				337,573	49,859	387,432
Ending Balance at Dec. 31, 2021	$ 255	$ 784,356	$ (827,381)	$ 712,478	$ 14,158	$ 683,866