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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 2,225 2,102 4,450 4,204
Expected return on plan assets (2,043) (2,863) (4,098) (5,725)
Amortization of prior service costs, (gains) losses and net transition asset 3,302 4,266 6,586 8,531
Net periodic benefit cost 3,484 3,505 6,938 7,010
Other Post-Retirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 5 8 10 17
Interest cost 51 51 102 101
Expected return on plan assets 0 0 0 0
Amortization of prior service costs, (gains) losses and net transition asset (34) (24) (68) (48)
Net periodic benefit cost $ 22 $ 35 $ 44 $ 70