Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 87,240	$ 85,762	$ 104,690
Foreign currency translation adjustment	(415)	(985)	(5,022)
Comprehensive income	$ 86,825	$ 84,777	$ 99,668