CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 178,916	$ 158,623	$ 491,108	$ 443,684
Other comprehensive (loss) income:
Foreign currency translation adjustments	(21,160)	13,177	(28,444)	(7,292)
Change in unrealized (loss) gain on investments, net of income tax benefit (provision) of $353, $559, $1,700, and $(3,120) for the three and nine months ended September 30, 2021 and 2020, respectively	(1,009)	(1,724)	(5,081)	6,582
Other comprehensive (loss) income	(22,169)	11,453	(33,525)	(710)
Comprehensive income	$ 156,747	$ 170,076	$ 457,583	$ 442,974