Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 23,252	$ 28,101	$ 61,258	$ 70,809
Other comprehensive income (loss):
Foreign currency translation adjustment	37	(93)	86	64
Tax benefit (provision)	(10)	22	(23)	(14)
Comprehensive income	$ 23,279	$ 28,030	$ 61,321	$ 70,859