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Fair Value of Financial Instruments (Derivative Gains (Losses) By Income Statement Location) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Foreign Currency Transaction Gain (Loss), before Tax $ (792) $ (1,120) $ 1,310
Foreign Currency Transaction Gain (Loss) Including Derivatives, Before Tax (354) (577) (355)
Other Expense [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative, Gain (Loss) on Derivative, Net (253) (224) (181)
Other Operating Income (Expense) [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative, Gain (Loss) on Derivative, Net (607) (801) (536)
Forward contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net $ 438 $ 543 $ (1,665)