CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 139,371	$ 102,524	$ 1,616,900	$ 321,514
Change in foreign currency translation adjustment, net of tax	15,810	(92)	25,793	530
Change in unrealized gains (losses) on investments, net of tax	0	41	(194)	317
Other comprehensive income (loss)	15,810	(51)	25,599	847
Comprehensive income	$ 155,181	$ 102,473	$ 1,642,499	$ 322,361