CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - UNAUDITED - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 19,631	$ 21,514
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(355)	(15,084)
Unrealized holding losses on short-term investments arising during period	(6)	(24)
Other comprehensive loss, net of tax	(361)	(15,108)
Total comprehensive income, net of tax	$ 19,270	$ 6,406