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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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Retirement Plans [Abstract]        
Net (losses)/gains for retirement and profit-sharing plans, excess benefit plans and other similar plans $ 7,006 $ 11,506 $ 23,609 $ 18,445