Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 28,963	$ 24,593
Net cumulative translation adjustment and foreign currency exchange hedge, net of tax of $2,012 and $5, respectively	(2,237)	(49)
Net unrealized gain on securities available-for-sale, net of tax of $115 and $39, respectively	187	63
Comprehensive Income	$ 26,913	$ 24,607