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EMPLOYEE BENEFIT PLANS (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2013
EMPLOYEE BENEFIT PLANS [Abstract]      
Defined Benefit Plan, Contributions by Employer $ 1,100,000us-gaap_DefinedBenefitPlanContributionsByEmployer    
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year     3,600,000us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear
Defined Benefit Plan, Service Cost 172,000us-gaap_DefinedBenefitPlanServiceCost 197,000us-gaap_DefinedBenefitPlanServiceCost  
Defined Benefit Plan, Interest Cost 1,224,000us-gaap_DefinedBenefitPlanInterestCost 1,408,000us-gaap_DefinedBenefitPlanInterestCost  
Defined Benefit Plan, Expected Return on Plan Assets (1,519,000)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets (1,517,000)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets  
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Recognized in Net Periodic Benefit Cost, before Tax 34,000us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax 34,000us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax  
Defined Benefit Plan, Amortization of Gains (Losses) 729,000us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses 758,000us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses  
Defined Benefit Plan, Net Periodic Benefit Cost $ 640,000us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost $ 880,000us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost