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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 29 $ 54 $ 145 $ 178
Interest cost 3,103 3,263 9,431 9,993
Expected return on plan assets (3,743) (4,070) (11,216) (12,027)
Amortization of prior service costs, gains or losses and net transition asset 2,996 3,135 9,241 9,903
Net periodic benefit cost 2,385 2,382 7,601 8,047
Other Post-Retirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 7 8 25 29
Interest cost 73 67 226 236
Expected return on plan assets   0    
Amortization of prior service costs, gains or losses and net transition asset (84) (49) (207) (144)
Net periodic benefit cost $ (4) $ 26 $ 44 $ 121