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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, 2021
Mar. 31, 2020
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 0 $ 0
Interest cost 2,102 2,535
Expected return on plan assets (2,862) (2,804)
Amortization of prior service costs, (gains) losses and net transition asset 4,265 3,814
Net periodic benefit cost 3,505 3,545
Other Post-Retirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 9 9
Interest cost 50 60
Expected return on plan assets 0 0
Amortization of prior service costs, (gains) losses and net transition asset (24) (47)
Net periodic benefit cost $ 35 $ 22