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Benefit Plans (Schedule Of Amounts Recognized In Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Benefit Plans [Abstract]    
Net actuarial loss $ (8,533) $ (7,812)
Tax effect 1,792 1,641
Net amount recognized in accumulated other comprehensive loss $ 6,741 $ 6,171