Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Paid-in Capital Cumulative Effect, Period of Adoption, Adjustments	Paid-in Capital	Retained Earnings Cumulative Effect, Period of Adoption, Adjustments	Retained Earnings	Treasury Stock, at cost	Accumulated Other Comprehensive Income (Loss)	Cumulative Effect, Period of Adoption, Adjustments	Total
Beginning Balance at Dec. 31, 2020	$ 253		$ 767,484		$ 378,906	$ (827,381)	$ (35,701)		$ 283,561
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)					(6,042)		1,337		(4,705)
Employee stock-based compensation			3,885		18				3,903
Issuance of shares of common stock under long-term incentive plan	1								1
Common stock withheld related to net share settlement of equity awards			(1,317)						(1,317)
Ending Balance at Mar. 31, 2021	254		770,052		372,882	(827,381)	(34,364)		281,443
Beginning Balance at Dec. 31, 2020	253		767,484		378,906	(827,381)	(35,701)		283,561
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)									27,745
Ending Balance at Jun. 30, 2021	254		774,665		400,771	(827,381)	(29,780)		318,529
Beginning Balance at Mar. 31, 2021	254		770,052		372,882	(827,381)	(34,364)		281,443
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)					27,866		4,584		32,450
Employee stock-based compensation			4,613		23				4,636
Ending Balance at Jun. 30, 2021	254		774,665		400,771	(827,381)	(29,780)		318,529
Beginning Balance at Dec. 31, 2021	255		784,356		712,478	(827,381)	14,158		683,866
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends on common shares					(3,851)				(3,851)
Dividend Equivalents earned on RSU grants					(420)				(420)
Total comprehensive income (loss)					271,872		1,423		273,295
Employee stock-based compensation			8,203						8,203
Issuance of shares of common stock under long-term incentive plan	1								1
Common stock withheld related to net share settlement of equity awards			(4,827)						(4,827)
Issuance of shares of common stock for warrants exercised			506						506
Ending Balance (ASU 2020-06) at Mar. 31, 2022		$ (39,239)		$ 6,718				$ (32,521)
Ending Balance at Mar. 31, 2022	256		748,999		986,797	(827,381)	15,581		924,252
Beginning Balance at Dec. 31, 2021	255		784,356		712,478	(827,381)	14,158		683,866
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)									671,957
Ending Balance at Jun. 30, 2022	286		774,144		1,234,979	(827,381)	6,680		1,188,708
Beginning Balance at Mar. 31, 2022	256		748,999		986,797	(827,381)	15,581		924,252
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends on common shares					(150,716)				(150,716)
Dividend Equivalents earned on RSU grants					(8,665)				(8,665)
Total comprehensive income (loss)					407,563		(8,901)		398,662
Employee stock-based compensation			6,349						6,349
Common stock withheld related to net share settlement of equity awards			(81)						(81)
Issuance of shares of common stock for convertible debt exchanged	26		(29)						(3)
Issuance of shares of common stock for warrants exercised	4		18,906						18,910
Ending Balance at Jun. 30, 2022	$ 286		$ 774,144		$ 1,234,979	$ (827,381)	$ 6,680		$ 1,188,708