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	$ 101,984	$ 96,806	$ 79,406
Other comprehensive income (loss):
Foreign currency translation adjustment	(48)	(29)	161
Tax benefit (provision)	14	8	(42)
Comprehensive income	$ 101,950	$ 96,785	$ 79,525