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Fair Value Measurement (Schedule of Fair Value Measurements) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset (liabilities) $ (450) $ (568)
Foreign Exchange Future [Member] | Not Designated as Hedging Instrument [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 374 90
Derivative liabilities (196) (921)
Foreign Exchange Future [Member] | Designated as Hedging Instrument [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 263
Derivative liabilities $ (628)