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PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS - Schedule of property, plant and equipment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 432,068   $ 509,805
Accumulated depreciation (29,015)   (24,650)
Total property, plant and equipment, net 403,053 $ 495,345 485,155
Asset impairment 107,477    
Depreciation expense 4,400 $ 2,700  
Gathering pipelines and related equipment      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 281,477   319,058
Property, plant and equipment, Estimated useful lives 45 years    
Gas processing and compression facilities      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 133,941   173,679
Property, plant and equipment, Estimated useful lives 20 years    
Buildings      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 2,144   2,175
Property, plant and equipment, Estimated useful lives 30 years    
Other depreciable assets      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 5,543   5,589
Other depreciable assets | Minimum      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, Estimated useful lives 3 years    
Other depreciable assets | Maximum      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, Estimated useful lives 15 years    
Land and rights of way      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 9,027   9,027
Construction in progress      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross (64)   $ 277
Gathering & Processing      
Property, Plant and Equipment [Line Items]      
Asset impairment $ 78,300