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	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)
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	5,620				5,620
Employee stock options, restricted stock and employee stock purchase plan	(7)					(7)
Stock-based compensation expense	1,738		1,738
Treasury shares purchased at cost	(15,149)					(15,149)
Foreign currency translation, net of tax	1,999			1,999
Ending balance at Mar. 31, 2023	$ 417,229	$ 1,115	$ 643,004	$ (65,187)	$ 8,109	$ (169,812)