Derivative Instruments And Hedging Activities - Impact Of Derivative Instruments Designated As Hedging Instruments on Accumulated OCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivative Instruments, Net of Tax (Effective Portion)	$ 3,688	$ 4,892	$ 9,707	$ 9,865
Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivative Instruments, Net of Tax (Effective Portion)	3,620	4,249	9,341	10,745
Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivative Instruments, Net of Tax (Effective Portion)	$ 68	$ 643	$ 366	$ (880)