Derivative Instruments And Hedging Activities - Loss Reclassified From Accumulated OCI Into Earnings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Loss Reclassified from Accumulated OCI into Earnings (Effective Portion)	$ (12,915)	$ (12,851)	$ (13,659)
Foreign Exchange Contracts [Member] | Cost of Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Loss Reclassified from Accumulated OCI into Earnings (Effective Portion)	(12,300)	(10,827)	(11,516)
Interest Rate Swaps [Member] | Net Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Loss Reclassified from Accumulated OCI into Earnings (Effective Portion)	$ (615)	$ (2,024)	$ (2,143)