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, 2020	$ 488,032	$ 1,076	$ 627,031	$ (54,172)	$ 50,937	$ (136,840)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(5,362)				(5,362)
Employee stock options, restricted stock and employee stock purchase plan	257	1	242		(21)	35
Stock-based compensation expense	1,279		1,279
Foreign currency translation, net of tax	(3,284)			(3,284)
Ending balance at Mar. 31, 2021	480,922	1,077	628,552	(57,456)	45,554	(136,805)
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)	2,521				2,521
Employee stock options, restricted stock and employee stock purchase plan	(4)					(4)
Stock-based compensation expense	1,468		1,468
Foreign currency translation, net of tax	(1,228)			(1,228)
Ending balance at Mar. 31, 2022	$ 465,143	$ 1,093	$ 636,397	$ (62,708)	$ 26,866	$ (136,505)