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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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 2,101 2,535 6,305 7,605
Expected return on plan assets (2,862) (2,804) (8,587) (8,412)
Amortization of prior service costs, (gains) losses and net transition asset 4,268 3,814 12,799 11,441
Net periodic benefit cost 3,507 3,545 10,517 10,634
Other Post-Retirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 9 9 26 28
Interest cost 50 60 151 180
Expected return on plan assets 0 0 0 0
Amortization of prior service costs, (gains) losses and net transition asset (24) (47) (72) (141)
Net periodic benefit cost $ 35 $ 22 $ 105 $ 67