Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 32,194	$ 61,338	$ 37,729
Other comprehensive income (loss), net of reclassification adjustments:
Unrealized loss on interest rate swap contracts, net of tax	0	(420)	(421)
Foreign currency translation adjustments	3,924	1,828	(4,320)
Other comprehensive income (loss)	3,924	1,408	(4,741)
Comprehensive income	$ 36,118	$ 62,746	$ 32,988