Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 204,902	$ 172,852	$ 148,089
Net cumulative translation adjustment and foreign currency exchange hedge, net of tax of $(1,218), $1,290 and $(2,807), respectively	1,128	(2,078)	2,236
Net unrealized gain (loss) on securities available-for-sale, net of tax of $312, $(23), and $(39), respectively	996	(90)	(234)
Comprehensive income	$ 207,026	$ 170,684	$ 150,091