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Financial Derivatives (Schedule Of Effect Of Derivative Instruments On The Statement Of Income) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Derivative Instruments, Gain (Loss) [Line Items]  
Fair value of derivatives in net liability $ 19
Other Contracts [Member] | Other Income (Expense) [Member]  
Derivative Instruments, Gain (Loss) [Line Items]  
Amount of Gain or (Loss) Recognized in Income on Derivatives $ 165