Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]
Foreign currency exchange hedge, tax expense (benefit)	$ 5,407	$ (258)	$ (275)
Securities available-for-sale, tax expense (benefit)	24	(111)	(9)
Sale of securities available- for-sale included in Other Income, tax benefit	$ 0	$ 0	$ (24)