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Employee Benefit Plans (Details 8)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Assumed Health Care Cost Trend Rates at Beginning of Year    
Health care cost trend rate assumed for next year 6.00%us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYear 6.50%us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYear
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) 5.00%us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate 5.00%us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate
Year that the rate reaches the ultimate trend rate 2017 2017