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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 | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Retirement Plans [Abstract] |  |  |
Defined contribution plans expense | $ 25,529 | $ 16,502 | $ 22,025

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