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INCOME TAXES (Details)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Differences between effective tax rates and the federal statutory rate applied to income before income taxes    
Effective tax rate (as a percent) 18.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations 17.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations