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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, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Medicare subsidy receipts in 2012 $ 1,187
Medicare subsidy receipts in 2013 1,390
Medicare subsidy receipts in 2014 1,594
Medicare subsidy receipts in 2015 1,788
Medicare subsidy receipts in 2016 2,014
Medicare subsidy receipts in 2017-2021 13,279
Pension And SERPA Benefits [Member]
 
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Expected benefit payments in 2012 66,118
Expected benefit payments in 2013 66,232
Expected benefit payments in 2014 67,171
Expected benefit payments in 2015 68,654
Expected benefit payments in 2016 70,532
Expected benefit payments in 2017-2021 411,974
SERPA Benefits [Member]
 
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Expected benefit payments in 2012 14,531
Expected benefit payments in 2013 2,096
Expected benefit payments in 2014 3,042
Expected benefit payments in 2015 1,529
Expected benefit payments in 2016 1,711
Expected benefit payments in 2017-2021 10,843
Postretirement Healthcare Benefits [Member]
 
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Expected benefit payments in 2012 30,239
Expected benefit payments in 2013 31,666
Expected benefit payments in 2014 32,192
Expected benefit payments in 2015 32,052
Expected benefit payments in 2016 31,629
Expected benefit payments in 2017-2021 $ 157,494