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	$ 64,304	$ 58,186	$ 199,664	$ 191,339
Other comprehensive (loss) income, net of tax
Foreign currency translation adjustment	(6,229)	7,535	(4,380)	(4,551)
Unrealized gain on investments	0	0	0	189
Reclassification adjustment for realized loss on investments included in net income	0	0	0	541
Total other comprehensive (loss) income	(6,229)	7,535	(4,380)	(3,821)
Total comprehensive income	$ 58,075	$ 65,721	$ 195,284	$ 187,518