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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, 2020
Mar. 31, 2019
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 0 $ 0
Interest cost 2,535 3,067
Expected return on plan assets (2,804) (3,404)
Amortization of prior service costs, (gains) losses and net transition asset 3,814 2,729
Net periodic benefit cost 3,545 2,392
Other Post-Retirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 9 8
Interest cost 60 73
Expected return on plan assets   0
Amortization of prior service costs, (gains) losses and net transition asset (47) (58)
Net periodic benefit cost $ 22 $ 23