Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Paid-In Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Treasury Stock
Beginning balance at Dec. 31, 2021	$ 462,386	$ 1,093	$ 634,929	$ (61,480)	$ 24,345	$ (136,501)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(5,231)				(5,231)
Employee stock options, restricted stock and employee stock purchase plan	(2,281)	20	(834)		(1,023)	(444)
Stock-based compensation expense	3,198		3,198
Foreign currency translation, net of tax	(7,321)			(7,321)
Ending balance at Jun. 30, 2022	450,751	1,113	637,293	(68,801)	18,091	(136,945)
Beginning balance at Mar. 31, 2022	465,143	1,093	636,397	(62,708)	26,866	(136,505)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(7,752)				(7,752)
Employee stock options, restricted stock and employee stock purchase plan	(2,277)	20	(834)		(1,023)	(440)
Stock-based compensation expense	1,730		1,730
Foreign currency translation, net of tax	(6,093)			(6,093)
Ending balance at Jun. 30, 2022	450,751	1,113	637,293	(68,801)	18,091	(136,945)
Beginning balance at Dec. 31, 2022	423,028	1,115	641,266	(67,186)	2,489	(154,656)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	7,322				7,322
Employee stock options, restricted stock and employee stock purchase plan	(1,668)	2	(7,129)		(5,908)	11,367
Stock-based compensation expense	3,298		3,298
Treasury shares purchased at cost	(20,149)					(20,149)
Foreign currency translation, net of tax	2,302			2,302
Ending balance at Jun. 30, 2023	414,133	1,117	637,435	(64,884)	3,903	(163,438)
Beginning balance at Mar. 31, 2023	417,229	1,115	643,004	(65,187)	8,109	(169,812)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	1,702				1,702
Employee stock options, restricted stock and employee stock purchase plan	(1,661)	2	(7,129)		(5,908)	11,374
Stock-based compensation expense	1,560		1,560
Treasury shares purchased at cost	(5,000)					(5,000)
Foreign currency translation, net of tax	303			303
Ending balance at Jun. 30, 2023	$ 414,133	$ 1,117	$ 637,435	$ (64,884)	$ 3,903	$ (163,438)