Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 8,172	$ 17,707	$ (7,121)
Other comprehensive income (loss), net of tax:
Translation income (loss)	2,256	(343)	(3,858)
Interest rate swap		(574)	76
Minimum pension liability adjustment	(2,247)	(184)	(22)
Comprehensive income (loss)	$ 8,181	$ 16,606	$ (10,925)