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 Income And Comprehensive Income [Abstract]
Net income	$ 67,776	$ 54,002	$ 226,446	$ 154,629
Net cumulative translation adjustment and foreign currency exchange hedge, net of tax of $1,654, $1,021, $(908) and $1,281, respectively	4,423	(1,416)	213	(1,398)
Net unrealized (loss) gain on securities available-for-sale, net of tax of $(276), $22, $(172), and $309, respectively	(871)	70	(542)	988
Comprehensive income	$ 71,328	$ 52,656	$ 226,117	$ 154,219