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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0 $ 5 $ 0 $ 10
Interest cost 3,068 2,882 6,135 5,764
Expected return on plan assets (3,404) (3,761) (6,808) (7,522)
Amortization of prior service costs, (gains) losses and net transition asset 2,730 3,428 5,459 6,856
Net periodic benefit cost 2,394 2,554 4,786 5,108
Other Post-Retirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 8 10 16 20
Interest cost 73 69 146 138
Expected return on plan assets   0    
Amortization of prior service costs, (gains) losses and net transition asset (57) (54) (115) (108)
Net periodic benefit cost $ 24 $ 25 $ 47 $ 50