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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
Mar. 31, 2013
Mar. 31, 2012
Pension Benefits [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ (870) $ (858)
Interest cost (3,106) (3,289)
Expected return on plan assets 4,329 4,811
Amortization of prior service costs, gains or losses and net transition asset (3,690) (2,626)
Net periodic benefit cost (3,337) (1,962)
Other Post-Retirement Benefits [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Service cost (18) (13)
Interest cost (89) (100)
Amortization of prior service costs, gains or losses and net transition asset 41 53
Net periodic benefit cost $ (66) $ (60)