Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Paid-in Capital	Retained Earnings	Treasury Stock at Cost	Accumulated Other Comprehensive Income	Total
Beginning Balance at Dec. 31, 2021	$ 255	$ 784,356	$ 712,478	$ (827,381)	$ 14,158	$ 683,866
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of accounting change on convertible debt		(39,239)	6,718			(32,521)
Dividends on common shares			(4,271)			(4,271)
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
Total comprehensive income (loss)			271,872		1,423	273,295
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)						851,488
Ending Balance at Sep. 30, 2022	286	766,427	1,299,024	(884,879)	5,203	1,186,061
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)
Employee stock-based compensation		6,349				6,349
Issuance of shares of common stock for convertible debt exchanged	26	(29)				(3)
Common stock withheld related to net share settlement of equity awards		(81)				(81)
Issuance of shares of common stock for warrants exercised	4	18,906				18,910
Total comprehensive income (loss)			407,563		(8,901)	398,662
Ending Balance at Jun. 30, 2022	286	774,144	1,234,979	(827,381)	6,680	1,188,708
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends on common shares			(110,071)			(110,071)
Dividend Equivalents earned on RSU grants		464	(6,891)			(6,427)
Purchase of common stock under share repurchase program				(57,498)		(57,498)
Employee stock-based compensation		6,285				6,285
Cash paid for convertible debt repurchased		(14,466)				(14,466)
Total comprehensive income (loss)			181,007		(1,477)	179,530
Ending Balance at Sep. 30, 2022	286	766,427	1,299,024	(884,879)	5,203	1,186,061
Beginning Balance at Dec. 31, 2022	288	724,660	1,565,374	(986,171)	61,429	1,365,580
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends on common shares			(55,140)			(55,140)
Dividend Equivalents earned on RSU grants		120	(2,354)			(2,234)
Purchase of common stock under share repurchase program		(13)		(18,994)		(19,007)
Employee stock-based compensation		6,767				6,767
Cash paid for convertible debt repurchased		(44,486)				(44,486)
Issuance of shares of common stock under long-term incentive plan	3					3
Common stock withheld related to net share settlement of equity awards		(27,055)				(27,055)
Issuance of shares of common stock for warrants exercised	10	43,719				43,729
Total comprehensive income (loss)			198,108		(2,271)	195,837
Ending Balance at Mar. 31, 2023	301	703,712	1,705,988	(1,005,165)	59,158	1,463,994
Beginning Balance at Dec. 31, 2022	288	724,660	1,565,374	(986,171)	61,429	1,365,580
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)						337,022
Ending Balance at Sep. 30, 2023	305	716,956	1,737,468	(1,107,878)	49,299	1,396,150
Beginning Balance at Mar. 31, 2023	301	703,712	1,705,988	(1,005,165)	59,158	1,463,994
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends on common shares			(45,011)			(45,011)
Dividend Equivalents earned on RSU grants		98	(669)			(571)
Purchase of common stock under share repurchase program				(74,231)		(74,231)
Employee stock-based compensation		6,439				6,439
Common stock withheld related to net share settlement of equity awards		(162)				(162)
Issuance of shares of common stock for warrants exercised		31				31
Total comprehensive income (loss)			77,353		(2,278)	75,075
Ending Balance at Jun. 30, 2023	301	710,118	1,737,661	(1,079,396)	56,880	1,425,564
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends on common shares			(71,573)			(71,573)
Dividend Equivalents earned on RSU grants		159	(2,311)			(2,152)
Purchase of common stock under share repurchase program				(28,482)		(28,482)
Employee stock-based compensation		6,493				6,493
Common stock withheld related to net share settlement of equity awards		(13)				(13)
Issuance of shares of common stock for warrants exercised	4	199				203
Total comprehensive income (loss)			73,691		(7,581)	66,110
Ending Balance at Sep. 30, 2023	$ 305	$ 716,956	$ 1,737,468	$ (1,107,878)	$ 49,299	$ 1,396,150