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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, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Pension Benefits
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 109 $ 1,076 $ 758 $ 2,816
Interest cost 3,365 3,039 10,048 9,253
Expected return on plan assets (4,610) (4,415) (13,726) (13,073)
Amortization of prior service costs, gains or losses and net transition asset 2,388 3,892 8,016 11,271
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments     81 0
Net periodic benefit cost 1,252 3,592 5,177 10,267
Other Post-Retirement Benefits
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 13 18 39 53
Interest cost 93 89 279 266
Expected return on plan assets   0    
Amortization of prior service costs, gains or losses and net transition asset (76) (41) (230) (122)
Net periodic benefit cost $ 30 $ 66 $ 88 $ 197