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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 2,102 2,535 4,204 5,070
Expected return on plan assets (2,863) (2,804) (5,725) (5,608)
Amortization of prior service costs, (gains) losses and net transition asset 4,266 3,814 8,531 7,628
Net periodic benefit cost 3,505 3,545 7,010 7,090
Other Post-Retirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 8 9 17 18
Interest cost 51 60 101 120
Expected return on plan assets 0 0 0 0
Amortization of prior service costs, (gains) losses and net transition asset (24) (47) (48) (94)
Net periodic benefit cost $ 35 $ 22 $ 70 $ 44