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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
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Retirement Plans [Abstract]      
Net (losses)/gains for retirement and profit-sharing plans, excess benefit plans and other similar plans $ 27,332 $ 27,044 $ 25,529