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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, 2017
Mar. 31, 2016
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 58 $ 72
Interest cost 3,164 3,365
Expected return on plan assets (3,736) (3,978)
Amortization of prior service costs, gains or losses and net transition asset 3,123 3,384
Net periodic benefit cost 2,609 2,843
Other Post-Retirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 9 11
Interest cost 76 85
Amortization of prior service costs, gains or losses and net transition asset (61) (48)
Net periodic benefit cost $ 24 $ 48