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INCOME TAXES (Details 4) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
INCOME TAXES      
Unrecognized tax benefits that will affect the effective tax rate $ 5.1us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate $ 5.2us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate $ 4.4us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
State      
INCOME TAXES      
Unrecognized tax benefits that will affect the effective tax rate 0.8us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		    
Unrecognized tax benefits that will be recognized in next twelve months 0.6us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		    
Federal      
INCOME TAXES      
Unrecognized tax benefits that will affect the effective tax rate     $ 0.2us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember