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Retirement Plans And Other Postretirement Benefits (Schedule Of Amounts Recognized Before Related Deferred Income Taxes In Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial (gain) loss $ 415 $ 103,998 $ 109,893
Other Post-Retirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial (gain) loss $ (1,250) $ (1,574) $ (320)