Derivative Instruments And Hedging Activities - Derivative Instruments not Designated as Hedging Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Liability derivatives not designated as hedging instruments	$ 12,695	$ 18,014
Accrued Liabilities [Member] | Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives not designated as hedging instruments	4,572	6,763
Other Liabilities [Member] | Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives not designated as hedging instruments	$ 8,123	$ 11,251