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Derivatives (Details 2) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Foreign currency option contracts | Derivatives not designated as hedging instruments    
Derivative Instruments, Gain (Loss) [Line Items]    
Net loss recognized in earnings [1] $ 0 $ (1,132)
Foreign currency option contracts | Cash Flow Hedge    
Derivative Instruments, Gain (Loss) [Line Items]    
Net gain (loss) recognized in Other Comprehensive Income (Loss), net of tax [2] 16 (90)
Net loss reclassified from Accumulated Other Comprehensive Loss into earnings, net of tax, effective portion to Net Sales (41) 42
Net gain reclassified from Accumulated Other Comprehensive Loss into earnings, net of tax, effective portion to Interest Income 0  
Net loss reclassified from Accumulated Other Comprehensive Loss into earnings, net of tax, effective portion to Net Foreign Currency Transaction Losses 0  
Net (loss) gain recognized in earnings [3] 7 (1)
Foreign currency forward contracts | Derivatives not designated as hedging instruments    
Derivative Instruments, Gain (Loss) [Line Items]    
Net loss recognized in earnings [1] (1,378) (1,368)
Foreign currency forward contracts | Cash Flow Hedge    
Derivative Instruments, Gain (Loss) [Line Items]    
Net gain (loss) recognized in Other Comprehensive Income (Loss), net of tax [2] (5,697) (17)
Net loss reclassified from Accumulated Other Comprehensive Loss into earnings, net of tax, effective portion to Net Sales (14) 19
Net gain reclassified from Accumulated Other Comprehensive Loss into earnings, net of tax, effective portion to Interest Income 391  
Net loss reclassified from Accumulated Other Comprehensive Loss into earnings, net of tax, effective portion to Net Foreign Currency Transaction Losses (3,927)  
Net (loss) gain recognized in earnings [3] $ 3 $ 2
[1] Classified in Net Foreign Currency Transaction Losses.
[2] Net change in the fair value of the effective portion classified in Other Comprehensive Income (Loss).
[3] Ineffective portion and amount excluded from effectiveness testing classified in Net Foreign Currency Transaction Losses