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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, 2018
Mar. 31, 2017
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 5 $ 58
Interest cost 2,882 3,164
Expected return on plan assets (3,761) (3,736)
Amortization of prior service costs, gains or losses and net transition asset 3,428 3,123
Net periodic benefit cost 2,554 2,609
Other Post-Retirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 10 9
Interest cost 69 76
Amortization of prior service costs, gains or losses and net transition asset (54) (61)
Net periodic benefit cost $ 25 $ 24