Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]
Beginning Balance at Dec. 31, 2021	$ 725,034	$ 1,407	$ 127,787	$ 946,048	$ (350,208)
Beginning Balance, Shares at Dec. 31, 2021		115,148,152			25,586,601
Net income	71,211			71,211
Employee stock plans	523		523
Employee stock plans, Shares		9,081
Shares withheld for taxes on awards	(2,912)		(2,912)
Shares withheld for taxes on awards, Shares		(35,856)
Stock-based compensation	2,226	$ 1	2,225
Stock-based compensation, Shares		79,926
Repurchases of common stock	(75,017)				$ (75,017)
Repurchases of common stock, Shares		(833,963)			833,963
Ending Balance at Mar. 31, 2022	721,065	$ 1,408	127,623	1,017,259	$ (425,225)
Ending Balance, Shares at Mar. 31, 2022		114,367,340			26,420,564
Beginning Balance at Dec. 31, 2021	725,034	$ 1,407	127,787	946,048	$ (350,208)
Beginning Balance, Shares at Dec. 31, 2021		115,148,152			25,586,601
Net income	160,127
Ending Balance at Jun. 30, 2022	641,475	$ 1,408	129,109	1,106,175	$ (595,217)
Ending Balance, Shares at Jun. 30, 2022		111,563,381			29,235,381
Beginning Balance at Mar. 31, 2022	721,065	$ 1,408	127,623	1,017,259	$ (425,225)
Beginning Balance, Shares at Mar. 31, 2022		114,367,340			26,420,564
Net income	88,916			88,916
Employee stock plans	429		429
Employee stock plans, Shares		8,834
Stock-based compensation	1,057		1,057
Stock-based compensation, Shares		2,024
Repurchases of common stock	(169,992)				$ (169,992)
Repurchases of common stock, Shares		(2,814,817)			2,814,817
Ending Balance at Jun. 30, 2022	641,475	$ 1,408	129,109	1,106,175	$ (595,217)
Ending Balance, Shares at Jun. 30, 2022		111,563,381			29,235,381
Beginning Balance at Dec. 31, 2022	518,349	$ 1,408	131,539	1,130,674	$ (745,272)
Beginning Balance, Shares at Dec. 31, 2022		108,743,423			32,098,410
Net income	41,131			41,131
Employee stock plans	316		316
Employee stock plans, Shares		8,504
Shares withheld for taxes on awards	(1,592)		(1,592)
Shares withheld for taxes on awards, Shares		(28,773)
Stock-based compensation	1,973	$ 1	1,972
Stock-based compensation, Shares		80,362
Ending Balance at Mar. 31, 2023	560,177	$ 1,409	132,235	1,171,805	$ (745,272)
Ending Balance, Shares at Mar. 31, 2023		108,803,516			32,098,410
Beginning Balance at Dec. 31, 2022	518,349	$ 1,408	131,539	1,130,674	$ (745,272)
Beginning Balance, Shares at Dec. 31, 2022		108,743,423			32,098,410
Net income	118,167
Ending Balance at Jun. 30, 2023	623,525	$ 1,409	134,293	1,248,841	$ (761,018)
Ending Balance, Shares at Jun. 30, 2023		108,567,816			32,363,306
Beginning Balance at Mar. 31, 2023	560,177	$ 1,409	132,235	1,171,805	$ (745,272)
Beginning Balance, Shares at Mar. 31, 2023		108,803,516			32,098,410
Net income	77,036			77,036
Employee stock plans	323		323
Employee stock plans, Shares		7,971
Shares withheld for taxes on awards	(855)		(855)
Shares withheld for taxes on awards, Shares		(15,663)
Stock-based compensation	2,590		2,590
Stock-based compensation, Shares		36,888
Repurchases of common stock	(15,746)				$ (15,746)
Repurchases of common stock, Shares		(264,896)			264,896
Ending Balance at Jun. 30, 2023	$ 623,525	$ 1,409	$ 134,293	$ 1,248,841	$ (761,018)
Ending Balance, Shares at Jun. 30, 2023		108,567,816			32,363,306