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Employee Benefit Plans Target Plan Assets Allocation (Details)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Net Periodic Benefit Cost, Expected Long-term Return on Assets 7.25% 8.75%
Defined Benefit Plan, Target Allocation Percentage of Assets 100.00% 100.00%
Equity Securities [Member]
   
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Target Allocation Percentage of Assets 47.00% 64.00%
Real Estate [Member]
   
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Target Allocation Percentage of Assets 8.00% 3.00%
Fixed Income Funds [Member]
   
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Target Allocation Percentage of Assets 44.00% 32.00%
Cash and Cash Equivalents [Member]
   
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Target Allocation Percentage of Assets 1.00% 1.00%