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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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 144 $ 105 $ 288 $ 649
Interest cost 3,313 3,342 6,625 6,683
Expected return on plan assets (4,407) (4,558) (8,814) (9,116)
Amortization of prior service costs, gains or losses and net transition asset 4,024 2,814 8,048 5,628
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments     0 81
Net periodic benefit cost 3,074 1,703 6,147 3,925
Other Post-Retirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 12 13 24 26
Interest cost 83 93 167 186
Expected return on plan assets   0    
Amortization of prior service costs, gains or losses and net transition asset (40) (77) (80) (154)
Net periodic benefit cost $ 55 $ 29 $ 111 $ 58