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Derivative Instruments And Hedging Activities - Impact Of Derivative Instruments Not Designated As Hedging Instruments On Consolidated Statement Of Operations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in Earnings on Derivative Instruments $ 1,198 $ (18,014) $ 7
Foreign Exchange Contracts [Member] | Other Income (Expense), Net [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in Earnings on Derivative Instruments $ 1,198 $ (18,014) $ 7