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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Commitments and contingencies    
Accrual for Environmental Loss Contingencies $ 1,500,000  
Indemnification agreements    
Commitments and contingencies    
Liabilities recorded under indemnification agreements 0 $ 0
Minimum    
Commitments and contingencies    
Environmental Loss Contingencies Estimate 1,500,000  
Maximum    
Commitments and contingencies    
Environmental Loss Contingencies Estimate $ 3,000,000