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Employee Benefit Plans (Summary of weighted-average assumptions used (as of the end of each year) to determine year-end obligations for pension and postretirement benefits) (Details)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase 4.00% 4.00%
Assumed health care cost trend rate Initial trend 8.00% 8.00%
Assumed health care cost trend rate Ultimate trend 5.00% 5.00%
Assumed health care cost trend rate Year ultimate reached 2019 2019
Qualified Pension Plan [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.60% 5.20%
Nonqualified Pension Plan [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.20% 4.80%
Postretirement Benefits [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.40% 5.00%