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Benefit Plans (Schedule Of Amounts Recognized In Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Benefit Plans [Abstract]      
Net Actuarial loss $ (6,975) $ (7,784) $ (6,366)
Accumulated pension adjustment (6,975) (7,784) (6,366)
Tax effect 1,465 1,635 2,164
Net amount recognized in accumulated other comprehensive loss $ (5,510) $ (6,149) $ (4,202)