Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 1,864	$ 5,763
Other comprehensive income (loss), net of tax:
Interest rate swap	(213)	193
Foreign currency translation	979	2,010
Comprehensive income	$ 2,630	$ 7,966