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Retirement Benefits - Future Benefit Payments (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Qualified Pension Benefits [Member]
 
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
2012 $ 47,100
2013 37,300
2014 37,000
2015 38,000
2016 38,400
2017-2021 208,800
SERP Pension Benefits [Member]
 
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
2012 6,137
2013 1,889
2014 3,492
2015 3,284
2016 3,328
2017-2021 18,652
Other Benefit [Member]
 
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
2012 1,354
2013 1,315
2014 1,259
2015 1,198
2016 1,231
2017-2021 6,453
2012, without Medicare Part D subsidy 1,778
2013, without Medicare Part D subsidy 1,770
2014, without Medicare Part D subsidy 1,739
2015, without Medicare Part D subsidy 1,700
2016, without Medicare Part D subsidy 1,652
2017-2021, without Medicare Part D subsidy $ 7,476