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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, 2016
Mar. 31, 2015
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 72 $ 144
Interest cost 3,365 3,312
Expected return on plan assets (3,978) (4,407)
Amortization of prior service costs, gains or losses and net transition asset 3,384 4,024
Net periodic benefit cost 2,843 3,073
Other Post-Retirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 11 12
Interest cost 85 84
Expected return on plan assets   0
Amortization of prior service costs, gains or losses and net transition asset (48) (40)
Net periodic benefit cost $ 48 $ 56