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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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 110 $ 109 $ 398 $ 758
Interest cost 3,288 3,365 9,913 10,048
Expected return on plan assets (4,413) (4,610) (13,227) (13,726)
Amortization of prior service costs, gains or losses and net transition asset 4,094 2,388 12,142 8,016
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments     0 81
Net periodic benefit cost 3,079 1,252 9,226 5,177
Other Post-Retirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 9 13 33 39
Interest cost 77 93 244 279
Expected return on plan assets   0    
Amortization of prior service costs, gains or losses and net transition asset (65) (76) (145) (230)
Net periodic benefit cost $ 21 $ 30 $ 132 $ 88