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Fair-Value Measurements (Schedule of /Gains on Changes in Fair Value of Derivative Instruments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Foreign Exchange Option | Not Designated as Hedging Instrument      
Derivative Instruments, Gain (Loss) [Line Items]      
Foreign currency options gains/(losses) $ (64) $ 0 $ (61)