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Employee Benefit Plans Effect of One Percentage Point Change in Assumed Health Care Cost Trend Table (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates  
Effect of One Percentage Point Increase on Service and Interest Cost Components $ 0us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents
Effect of One Percentage Point Decrease on Service and Interest Cost Components 0us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1
Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation 50us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation
Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation $ (40)us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1