CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 156,497	$ 161,915	$ 312,192	$ 285,061
Other comprehensive income (loss):
Foreign currency translation adjustments	16,981	5,808	(7,284)	(20,469)
Change in unrealized (loss) gain on investments, net of income tax benefit (provision) of $410, $(5,144), $1,347, and $(3,679) for the three and six months ended June 30, 2021 and 2020, respectively	(1,191)	15,880	(4,072)	8,306
Other comprehensive income (loss)	15,790	21,688	(11,356)	(12,163)
Comprehensive income	$ 172,287	$ 183,603	$ 300,836	$ 272,898