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Employee Benefit Plans Target Plan Assets Allocation (Details)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets 8.75% 9.25%
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities 64.00% 65.00%
Defined Benefit Plan, Target Allocation Percentage of Assets, Real Estate 3.00% 3.00%
Defined Benefit Plan, Target Allocation Percentage of Assets, Fixed Income 32.00% 31.00%
Defined Benefit Plan, Target Allocation Percentage of Assets, Other 1.00% 1.00%
Defined Benefit Plan, Target Asset Allocations, Total (100.00%) (100.00%)