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Other Noncurrent Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Other Noncurrent Liabilities [Abstract]    
Pension liabilities $ 37,867us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent $ 40,981us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent
Postretirement benefits other than pensions 60,237us-gaap_OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent 56,052us-gaap_OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent
Interest rate swap agreement 1,411us-gaap_DerivativeLiabilitiesNoncurrent 3,119us-gaap_DerivativeLiabilitiesNoncurrent
Incentive and deferred compensation 2,730us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent 4,960us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent
Other 834us-gaap_OtherAccruedLiabilitiesNoncurrent 902us-gaap_OtherAccruedLiabilitiesNoncurrent
Total $ 103,079us-gaap_OtherLiabilitiesNoncurrent $ 106,014us-gaap_OtherLiabilitiesNoncurrent