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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Retirement Plans [Abstract] |  |  |  |
Defined contribution plans expense | $ 3,796 | $ 4,807 | $ 10,710 | $ 9,974

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