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Employee Benefit Plans (Changes In The Assumed Healthcare Cost Trend) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($)
Employee Benefit Plans [Abstract] |
Effect on total service and interest cost components, Percentage Point Increase | $ 434
Effect on total service and interest cost components, Percentage Point Decrease | (335)
Effect on accumulated post-retirement benefit obligation, Percentage Point Increase | 6,257
Effect on accumulated post-retirement benefit obligation, Percentage Point Decrease | $ (4,833)

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