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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 54 $ 110 $ 178 $ 398
Interest cost 3,263 3,288 9,993 9,913
Expected return on plan assets (4,070) (4,413) (12,027) (13,227)
Amortization of prior service costs, gains or losses and net transition asset 3,135 4,094 9,903 12,142
Net periodic benefit cost 2,382 3,079 8,047 9,226
Other Post-Retirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 8 9 29 33
Interest cost 67 77 236 244
Expected return on plan assets   0    
Amortization of prior service costs, gains or losses and net transition asset (49) (65) (144) (145)
Net periodic benefit cost $ 26 $ 21 $ 121 $ 132