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COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2017
Mar. 31, 2017
Dec. 31, 2015
Maximum | Meadowland Midstream Gathering System | Principal Owner      
Loss Contingencies [Line Items]      
Coverage from pollution liability insurance policy   $ 25,000,000 $ 25,000,000
Coverage from property and business interruption insurance policy   $ 200,000,000  
Business Interruption      
Loss Contingencies [Line Items]      
Recoveries recognized $ 2,600,000    
Property Recoveries      
Loss Contingencies [Line Items]      
Recoveries recognized $ 400,000