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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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 3,028 2,225 6,056 4,450
Expected return on plan assets (2,607) (2,043) (5,214) (4,098)
Amortization of prior service costs, (gains) losses and net transition asset 2,982 3,302 5,965 6,586
Net periodic benefit cost 3,403 3,484 6,807 6,938
Other Post-Retirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 3 5 6 10
Interest cost 71 51 142 102
Expected return on plan assets 0 0 0 0
Amortization of prior service costs, (gains) losses and net transition asset (59) (34) (118) (68)
Net periodic benefit cost $ 15 $ 22 $ 30 $ 44