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Derivative Instruments Derivative Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Derivative Instruments [Abstract]          
Forward contracts $ 268   $ 268    
Foreign Currency Contracts, Liability, Fair Value Disclosure 86   86   $ 997
Derivative, Notional Amount 26,648   26,648    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net $ 53 $ 147 $ (765) $ 59