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Retirement and Postretirement Plans Retirement and Postretirment Plans (Assumptions) (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Qualified Plan [Member]    
Discount Yield (as a percent) 3.91%us-gaap_FairValueInputsDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember		 4.66%us-gaap_FairValueInputsDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Discount rate (as a percent) 4.66%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember		  
Pension Costs [Member]    
Discount rate (as a percent)   3.64%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_RegulatoryLiabilityAxis
= us-gaap_PensionCostsMember
Long-Duration Contracts, Assumptions by Product and Guarantee, Estimated Average Investment Yield 6.00%us-gaap_LongDurationContractsAssumptionsByProductAndGuaranteeEstimatedAverageInvestmentYield
/ us-gaap_RegulatoryLiabilityAxis
= us-gaap_PensionCostsMember		 5.75%us-gaap_LongDurationContractsAssumptionsByProductAndGuaranteeEstimatedAverageInvestmentYield
/ us-gaap_RegulatoryLiabilityAxis
= us-gaap_PensionCostsMember