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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 | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Retirement Plans [Abstract] |  |  |  |
Defined contribution plans (losses)/gains | $ 11,506 | $ 6,445 | $ 18,445 | $ 17,155

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