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Financial Instruments - Non Designated Derivatives in Foreign Currency Relationships (Details) - Not Designated as Hedging Instrument [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Derivative Instruments Gain Loss [Line Items]        
Location of Derivative (Loss) Gain $ (122) $ 75 $ 269 $ 102
Foreign Exchange Contracts - Forwards [Member]        
Derivative Instruments Gain Loss [Line Items]        
Derivative Gain Reclassified From AOCI (Ineffective portion) (25)   (318)  
Foreign Exchange Contracts - Forwards [Member] | Selling, General and Administrative Expenses [Member]        
Derivative Instruments Gain Loss [Line Items]        
Location of Derivative (Loss) Gain $ (122) $ 75 $ 269 $ 102