Derivative Instruments And Hedging Activities - Derivative Instruments not Designated as Hedging Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Liability derivatives not designated as hedging instruments	$ 13,610	$ 18,014
Accrued Liabilities [Member] | Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives not designated as hedging instruments	4,990	6,763
Other Liabilities [Member] | Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives not designated as hedging instruments	$ 8,620	$ 11,251