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Pension And Other Post-Retirement Benefits (Schedule Of Components Of Net Periodic Benefit Cost For Pension And Other Post-Retirement Benefit Programs) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 0 $ 0
Interest cost 3,027 2,225
Expected return on plan assets (2,607) (2,055)
Amortization of prior service costs, (gains) losses and net transition asset 2,983 3,284
Net periodic benefit cost 3,403 3,454
Other Post-Retirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 3 5
Interest cost 71 51
Expected return on plan assets 0 0
Amortization of prior service costs, (gains) losses and net transition asset (59) (34)
Net periodic benefit cost $ 15 $ 22