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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
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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)

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