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Benefit Plans (Details 7) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]  
Effect on total service and interest cost components one percentage point increase $ 418us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents
Effect on the postretirement benefit obligation one percentage increase 5,301us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation
Effect on total service and interest cost components one percentage point decrease (328)us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1
Effect on the postretirement benefit obligation one percentage point decrease $ (4,092)us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1