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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 | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Retirement Plans [Abstract] |  |  |  |
Net (losses)/gains for retirement and profit-sharing plans, excess benefit plans and other similar plans | $ 7,904 | $ 11,354 | $ 16,603 | $ 6,940

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