Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Treasury Stock, at Cost	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Balance (in shares) at Dec. 31, 2018		57,494,468
Beginning balance at Dec. 31, 2018	$ 779,477	$ 57	$ 648,651	$ 0	$ (62,355)	$ 193,124
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	17,283		17,283
Issuance of common stock under the Equity Incentive Plan (in shares)		684,974
Issuance of common stock under the Equity Incentive Plan	25,368	$ 1	25,367
Shares received in net share settlement of stock option exercises and vesting of restricted stock (in shares)		(84,021)
Shares received in net share settlement of stock option exercises and vesting of restricted stock	(11,326)		(11,326)
Purchase of treasury stock	(31,944)			(31,944)
Retirement of treasury stock (in shares)		(211,401)
Retirement of treasury stock	0		(31,944)	31,944
Other comprehensive income	12,024				12,024
Net income	180,386					180,386
Balance (in shares) at Dec. 31, 2019		57,884,020
Ending balance at Dec. 31, 2019	971,268	$ 58	648,031	0	(50,331)	373,510
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)		2,138,580
Issuance of common stock	249,790	$ 2	249,788
Stock-based compensation expense	20,996		20,996
Issuance of common stock under the Equity Incentive Plan (in shares)		758,309
Issuance of common stock under the Equity Incentive Plan	35,870	$ 1	35,869
Shares received in net share settlement of stock option exercises and vesting of restricted stock (in shares)		(83,428)
Shares received in net share settlement of stock option exercises and vesting of restricted stock	(12,173)		(12,173)
Purchase of treasury stock	(32,208)			(32,208)
Retirement of treasury stock (in shares)		(231,313)
Retirement of treasury stock	0	$ (1)	(32,207)	32,208
Other comprehensive income	23,262				23,262
Net income	26,992					26,992
Balance (in shares) at Dec. 31, 2020		60,466,168
Ending balance at Dec. 31, 2020	1,283,797	$ 60	910,304	0	(27,069)	400,502
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	23,060		23,060
Issuance of common stock under the Equity Incentive Plan (in shares)		534,729
Issuance of common stock under the Equity Incentive Plan	34,970	$ 1	34,969
Shares received in net share settlement of stock option exercises and vesting of restricted stock (in shares)		(55,985)
Shares received in net share settlement of stock option exercises and vesting of restricted stock	(8,662)		(8,662)
Purchase of treasury stock	(214,058)			(214,058)
Retirement of treasury stock (in shares)		(1,639,752)
Retirement of treasury stock	0	$ (2)	(214,056)	214,058
Other comprehensive income	(10,290)				(10,290)
Net income	70,459					70,459
Balance (in shares) at Dec. 31, 2021		59,305,160
Ending balance at Dec. 31, 2021	$ 1,179,276	$ 59	$ 745,615	$ 0	$ (37,359)	$ 470,961