Derivative Instruments And Hedging Activities - Impact Of Derivative Instruments Designated As Hedging Instruments on Accumulated OCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivative Instruments, Net of Tax (Effective Portion)	$ 3,176	$ 474	$ 6,019	$ 4,973
Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivative Instruments, Net of Tax (Effective Portion)	3,191	674	5,721	6,496
Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivative Instruments, Net of Tax (Effective Portion)	$ (15)	$ (200)	$ 298	$ (1,523)