CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 73,185	$ 39,122	$ 13,425
Other comprehensive (loss) income
Foreign currency translation adjustments, net of taxes	(1,783)	3,008	(1,183)
Comprehensive income	$ 71,402	$ 42,130	$ 12,242