Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 96,806	$ 79,406	$ 153,920
Other comprehensive income (loss):
Foreign currency translation adjustment	(29)	161	(174)
Tax benefit (provision)	8	(42)	61
Comprehensive income	$ 96,785	$ 79,525	$ 153,807