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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 7 $ 29 $ 17 $ 145
Interest cost 2,818 3,103 8,582 9,431
Expected return on plan assets (3,736) (3,743) (11,258) (11,216)
Amortization of prior service costs, (gains) losses and net transition asset 3,565 2,996 10,421 9,241
Net periodic benefit cost 2,654 2,385 7,762 7,601
Other Post-Retirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 7 7 27 25
Interest cost 65 73 203 226
Expected return on plan assets   0    
Amortization of prior service costs, (gains) losses and net transition asset (75) (84) (183) (207)
Net periodic benefit cost $ (3) $ (4) $ 47 $ 44