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Retirement Plans (Schedule Of Net (Losses)/Expenses For Retirement, Profit-Sharing Plans, Excess Benefit Plans And Other Similar Plans) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Retirement Plans [Abstract] |  |
Defined contribution plans (losses)/gains | $ (4,414) | $ 6,914

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