Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings (Deficit) [Member]	Treasury Stock [Member]
Beginning Balance at Dec. 31, 2020	$ 588,531	$ 1,406	$ 126,087	$ 737,311	$ (276,273)
Beginning Balance, Shares at Dec. 31, 2020		115,799,503			24,777,502
Net income	48,545			48,545
Employee stock plans	460		460
Employee stock plans, Shares		28,286
Shares withheld for taxes on awards	(4,045)		(4,045)
Shares withheld for taxes on awards, Shares		(38,212)
Stock-based compensation	2,176		2,176
Stock-based compensation, Shares		76,094
Repurchases of common stock	(45,523)				$ (45,523)
Repurchases of common stock, Shares		(504,275)			504,275
Ending Balance at Mar. 31, 2021	590,143	$ 1,406	124,678	785,855	$ (321,796)
Ending Balance, Shares at Mar. 31, 2021		115,361,396			25,281,777
Beginning Balance at Dec. 31, 2020	588,531	$ 1,406	126,087	737,311	$ (276,273)
Beginning Balance, Shares at Dec. 31, 2020		115,799,503			24,777,502
Net income	183,705
Ending Balance at Sep. 30, 2021	720,809	$ 1,407	126,956	921,016	$ (328,570)
Ending Balance, Shares at Sep. 30, 2021		115,349,226			25,354,216
Beginning Balance at Mar. 31, 2021	590,143	$ 1,406	124,678	785,855	$ (321,796)
Beginning Balance, Shares at Mar. 31, 2021		115,361,396			25,281,777
Net income	61,366			61,366
Employee stock plans	400		400
Employee stock plans, Shares		20,341
Shares withheld for taxes on awards	(1,446)		(1,446)
Shares withheld for taxes on awards, Shares		(13,491)
Stock-based compensation	2,133	$ 1	2,132
Stock-based compensation, Shares		17,210
Repurchases of common stock	(3,820)				$ (3,820)
Repurchases of common stock, Shares		(40,751)			40,751
Ending Balance at Jun. 30, 2021	648,776	$ 1,407	125,764	847,221	$ (325,616)
Ending Balance, Shares at Jun. 30, 2021		115,344,705			25,322,528
Net income	73,795			73,795
Employee stock plans	464		464
Employee stock plans, Shares		36,590
Shares withheld for taxes on awards	(1,159)		(1,159)
Shares withheld for taxes on awards, Shares		(10,946)
Stock-based compensation	1,887	$ 0	1,887
Stock-based compensation, Shares		10,565
Repurchases of common stock	(2,954)				$ (2,954)
Repurchases of common stock, Shares		(31,688)			31,688
Ending Balance at Sep. 30, 2021	720,809	$ 1,407	126,956	921,016	$ (328,570)
Ending Balance, Shares at Sep. 30, 2021		115,349,226			25,354,216
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	174,549
Ending Balance at Sep. 30, 2022	556,538	$ 1,408	129,784	1,120,598	$ (695,252)
Ending Balance, Shares at Sep. 30, 2022		109,874,171			30,946,057
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
Net income	14,423			14,423
Employee stock plans	429		429
Employee stock plans, Shares		11,003
Shares withheld for taxes on awards	(3)		(3)
Shares withheld for taxes on awards, Shares		(57)
Stock-based compensation	249		249
Stock-based compensation, Shares		10,520
Repurchases of common stock	(100,035)				$ (100,035)
Repurchases of common stock, Shares		(1,710,676)			1,710,676
Ending Balance at Sep. 30, 2022	$ 556,538	$ 1,408	$ 129,784	$ 1,120,598	$ (695,252)
Ending Balance, Shares at Sep. 30, 2022		109,874,171			30,946,057