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Employee Benefit Plans And Other Postretirement Benefits (Schedule Of Expected Benefit Payments And Medicare Subsidy Receipts For Next Five Years And Thereafter) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Medicare subsidy receipts in 2013 $ 1,418
Medicare subsidy receipts in 2014 1,639
Medicare subsidy receipts in 2015 1,851
Medicare subsidy receipts in 2016 2,104
Medicare subsidy receipts in 2017 2,301
Medicare subsidy receipts in 2018-2022 15,240
Pension And SERPA Benefits [Member]
 
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Expected benefit payments in 2013 66,638
Expected benefit payments in 2014 67,587
Expected benefit payments in 2015 68,536
Expected benefit payments in 2016 70,042
Expected benefit payments in 2017 72,095
Expected benefit payments in 2018-2022 414,800
SERPA Benefits [Member]
 
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Expected benefit payments in 2013 2,262
Expected benefit payments in 2014 2,725
Expected benefit payments in 2015 1,611
Expected benefit payments in 2016 1,691
Expected benefit payments in 2017 2,113
Expected benefit payments in 2018-2022 12,346
Postretirement Healthcare Benefits [Member]
 
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Expected benefit payments in 2013 30,054
Expected benefit payments in 2014 30,449
Expected benefit payments in 2015 30,735
Expected benefit payments in 2016 30,247
Expected benefit payments in 2017 29,679
Expected benefit payments in 2018-2022 $ 146,714