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COMMITMENTS AND CONTINGENCIES (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Jan. 10, 2013
Jan. 23, 2015
Contingencies      
Estimated life-cycle costs, minimum   $ 0.7us-gaap_LossContingencyRangeOfPossibleLossMinimum  
Estimated life-cycle costs, maximum   3.4us-gaap_LossContingencyRangeOfPossibleLossMaximum  
Reserve for estimated life-cycle costs 0.2us-gaap_LossContingencyAccrualCarryingValueCurrent    
Minimum      
Contingencies      
Loss contingency, entity portion of potential cost 0.1us-gaap_LossContingencyEstimateOfPossibleLoss
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Maximum      
Contingencies      
Loss contingency, entity portion of potential cost 0.5us-gaap_LossContingencyEstimateOfPossibleLoss
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Scenario, Forecast [Member]      
Contingencies      
Estimated life-cycle costs, minimum     0.9us-gaap_LossContingencyRangeOfPossibleLossMinimum
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
Estimated life-cycle costs, maximum     $ 3.7us-gaap_LossContingencyRangeOfPossibleLossMaximum
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember