Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 155,695	$ 123,146
Other comprehensive loss:
Foreign currency translation adjustments	(24,265)	(26,277)
Change in unrealized loss on investments, net of income tax benefit of $937 and $1,465 for the three months ended March 31, 2021 and 2020, respectively	(2,881)	(7,574)
Other comprehensive loss	(27,146)	(33,851)
Comprehensive income	$ 128,549	$ 89,295