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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, 2022
Mar. 31, 2021
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 0 $ 0
Interest cost 2,225 2,102
Expected return on plan assets (2,055) (2,862)
Amortization of prior service costs, (gains) losses and net transition asset 3,284 4,265
Net periodic benefit cost 3,454 3,505
Other Post-Retirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 5 9
Interest cost 51 50
Expected return on plan assets 0 0
Amortization of prior service costs, (gains) losses and net transition asset (34) (24)
Net periodic benefit cost $ 22 $ 35