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Employee Benefit Plans - Expected Health Care Cost Trend Rates (Details) (Postretirement [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Postretirement [Member]
   
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]    
Health care cost trend rate assumed for next year   7.00%us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYear
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Rate to which the cost trend rate is assumed to decline (ultimate trend rate)   5.00%us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate
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Year that the rate reaches the ultimate trend rate   2017 [1]
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]    
Effect of one percentage point increase on total of service and interest cost components $ 253us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents
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Effect of one percentage point decrease on total of service and interest cost components (208)us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1
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Effect of one percentage point increase on accumulated postretirement benefit obligation 1,389us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation
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Effect of one percentage point decrease on accumulated postretirement benefit obligation $ (1,183)us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1
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[1] The entire postretirement medical plan was contributed to Rayonier Advanced Materials as a result of the spin-off of the Performance Fibers business.