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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 58 $ 52 $ 116 $ 124
Interest cost 3,164 3,365 6,328 6,730
Expected return on plan assets (3,737) (3,979) (7,473) (7,957)
Amortization of prior service costs, gains or losses and net transition asset 3,122 3,384 6,245 6,768
Net periodic benefit cost 2,607 2,822 5,216 5,665
Other Post-Retirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 9 10 18 21
Interest cost 77 84 153 169
Expected return on plan assets   0    
Amortization of prior service costs, gains or losses and net transition asset (62) (47) (123) (95)
Net periodic benefit cost $ 24 $ 47 $ 48 $ 95