Condensed Consolidated Statements of Changes in Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]
Beginning Balance at Dec. 31, 2019	$ 874,475	$ 416	$ 288,935	$ 634,668	$ (47,001)	$ (2,543)
Beginning Balance, shares at Dec. 31, 2019		41,549
Stock-based compensation expense	1,860		1,860
Issuance of common stock under equity award plans, net of forfeitures		$ (2)	69			(67)
Issuance of common stock under equity award plans, net of forfeitures, Share		(146)
Shares withheld for taxes paid related to net share settlement of equity awards	(1,009)		(1,009)
Shares withheld for taxes paid related to net share settlement of equity awards, Share		(39)
Repurchase of common stock	(22,909)					(22,909)
Retirement of treasury stock		$ (9)	(26)	(22,874)		22,909
Retirement of treasury stock, shares		(860)
Comprehensive income (loss)	(8,813)			13,918	(22,731)
Ending Balance at Mar. 31, 2020	843,604	$ 405	289,829	625,712	(69,732)	(2,610)
Ending Balance, shares at Mar. 31, 2020		40,504
Beginning Balance at Dec. 31, 2019	874,475	$ 416	288,935	634,668	(47,001)	(2,543)
Beginning Balance, shares at Dec. 31, 2019		41,549
Repurchase of common stock	(35,928)
Comprehensive income (loss)	21,469
Ending Balance at Jun. 30, 2020	862,785	$ 401	291,814	634,943	(61,680)	(2,693)
Ending Balance, shares at Jun. 30, 2020		40,055
Beginning Balance at Mar. 31, 2020	843,604	$ 405	289,829	625,712	(69,732)	(2,610)
Beginning Balance, shares at Mar. 31, 2020		40,504
Stock-based compensation expense	2,042		2,042
Issuance of common stock under equity award plans, net of forfeitures		$ 1	82			(83)
Issuance of common stock under equity award plans, net of forfeitures, Share		57
Shares withheld for taxes paid related to net share settlement of equity awards	(124)		(124)
Shares withheld for taxes paid related to net share settlement of equity awards, Share		(6)
Repurchase of common stock	(13,019)					(13,019)
Retirement of treasury stock		$ (5)	(15)	(12,999)		13,019
Retirement of treasury stock, shares		(500)
Comprehensive income (loss)	30,282			22,230	8,052
Ending Balance at Jun. 30, 2020	862,785	$ 401	291,814	634,943	(61,680)	(2,693)
Ending Balance, shares at Jun. 30, 2020		40,055
Beginning Balance at Dec. 31, 2020	893,654	$ 396	298,037	639,000	(40,999)	(2,780)
Beginning Balance, shares at Dec. 31, 2020		39,614
Stock-based compensation expense	4,751		4,751
Issuance of common stock under equity award plans, net of forfeitures		$ 2	287			(289)
Issuance of common stock under equity award plans, net of forfeitures, Share		241
Shares withheld for taxes paid related to net share settlement of equity awards	(3,441)	$ (1)	(3,440)
Shares withheld for taxes paid related to net share settlement of equity awards, Share		(76)
Comprehensive income (loss)	21,499			24,978	(3,479)
Ending Balance at Mar. 31, 2021	916,463	$ 397	299,635	663,978	(44,478)	(3,069)
Ending Balance, shares at Mar. 31, 2021		39,779
Beginning Balance at Dec. 31, 2020	893,654	$ 396	298,037	639,000	(40,999)	(2,780)
Beginning Balance, shares at Dec. 31, 2020		39,614
Comprehensive income (loss)	46,371
Ending Balance at Jun. 30, 2021	944,643	$ 398	303,065	687,158	(42,786)	(3,192)
Ending Balance, shares at Jun. 30, 2021		39,797
Beginning Balance at Mar. 31, 2021	916,463	$ 397	299,635	663,978	(44,478)	(3,069)
Beginning Balance, shares at Mar. 31, 2021		39,779
Stock-based compensation expense	3,618		3,618
Issuance of common stock under equity award plans, net of forfeitures		$ 1	122			(123)
Issuance of common stock under equity award plans, net of forfeitures, Share		25
Shares withheld for taxes paid related to net share settlement of equity awards	(310)		(310)
Shares withheld for taxes paid related to net share settlement of equity awards, Share		(7)
Comprehensive income (loss)	24,872			23,180	1,692
Ending Balance at Jun. 30, 2021	$ 944,643	$ 398	$ 303,065	$ 687,158	$ (42,786)	$ (3,192)
Ending Balance, shares at Jun. 30, 2021		39,797