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Retirement Plans (Schedule Of 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, 2021 | Mar. 31, 2020
Retirement Plans [Abstract] |  |
Net (losses)/gains for retirement and profit-sharing plans, excess benefit plans and other similar plans | $ 8,699 | $ (4,414)

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