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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, 2019
Mar. 31, 2018
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 0 $ 5
Interest cost 3,067 2,882
Expected return on plan assets (3,404) (3,761)
Amortization of prior service costs, (gains) losses and net transition asset 2,729 3,428
Net periodic benefit cost 2,392 2,554
Other Post-Retirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 8 10
Interest cost 73 69
Expected return on plan assets   0
Amortization of prior service costs, (gains) losses and net transition asset (58) (54)
Net periodic benefit cost $ 23 $ 25