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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 2,535 3,067 7,605 9,202
Expected return on plan assets (2,804) (3,404) (8,412) (10,212)
Amortization of prior service costs, (gains) losses and net transition asset 3,814 2,729 11,441 8,188
Net periodic benefit cost 3,545 2,392 10,634 7,178
Other Post-Retirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 9 9 28 25
Interest cost 60 72 180 218
Expected return on plan assets 0 0 0 0
Amortization of prior service costs, (gains) losses and net transition asset (47) (58) (141) (173)
Net periodic benefit cost $ 22 $ 23 $ 67 $ 70