Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 28,101	$ 32,468	$ 70,809	$ 70,405
Other comprehensive income (loss):
Foreign currency translation adjustment	(93)	82	64	42
Tax benefit (provision)	22	(20)	(14)	(12)
Comprehensive income	$ 28,030	$ 32,530	$ 70,859	$ 70,435