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INCOME TAXES (Details)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
INCOME TAXES    
Effective tax rate (as a percent) (0.20%)us-gaap_EffectiveIncomeTaxRateContinuingOperations (0.10%)us-gaap_EffectiveIncomeTaxRateContinuingOperations