Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 123,146	$ 107,130
Other comprehensive (loss) income:
Foreign currency translation adjustment	(26,277)	502
Change in unrealized (loss) gain on investments, net of income tax benefit (provision) of $1,465 and $(554) for the three months ended March 31, 2020 and 2019, respectively	(7,574)	1,431
Other comprehensive (loss) income	(33,851)	1,933
Comprehensive income	$ 89,295	$ 109,063