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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Pension Benefits
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 105 $ 870 $ 649 $ 1,740
Interest cost 3,342 3,108 6,683 6,214
Expected return on plan assets (4,558) (4,329) (9,116) (8,658)
Amortization of prior service costs, gains or losses and net transition asset 2,814 3,689 5,628 7,379
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments 0 0 81 0
Net periodic benefit cost 1,703 3,338 3,925 6,675
Other Post-Retirement Benefits
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 13 17 26 35
Interest cost 93 88 186 177
Expected return on plan assets   0    
Amortization of prior service costs, gains or losses and net transition asset (77) (40) (154) (81)
Net periodic benefit cost $ 29 $ 65 $ 58 $ 131