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Employee Benefit Plans (Details 10)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Pre Medicare Eligible Claims [Member]
   
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]    
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year 9.00% 9.00%
Defined Benefit Plan, Description of Direction and Pattern of Change for Assumed Health Care Cost Trend Rate 9% down to 5% in 2016 9% down to 5% in 2015
Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate 2016 2015
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate 5.00% 5.00%
Medicare Eligible Claims [Member]
   
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]    
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year 9.00% 8.00%
Defined Benefit Plan, Description of Direction and Pattern of Change for Assumed Health Care Cost Trend Rate 9% down to 5% in 2015 8% down to 5% in 2013
Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate 2015 2013
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate 5.00% 5.00%