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PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS - Schedule of property, plant and equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Property, plant and equipment, net            
Property, plant and equipment, gross $ 432,494     $ 432,494   $ 509,805
Accumulated depreciation (32,612)     (32,612)   (24,650)
Total property, plant and equipment, net 399,882     399,882   485,155
Asset impairment       107,477    
Depreciation expense 3,600   $ 4,300 8,000 $ 6,900  
Gathering pipelines and related equipment            
Property, plant and equipment, net            
Property, plant and equipment, gross 284,010     $ 284,010   319,058
Property, plant and equipment, Estimated useful lives       45 years    
Gas processing and compression facilities            
Property, plant and equipment, net            
Property, plant and equipment, gross 131,673     $ 131,673   173,679
Property, plant and equipment, Estimated useful lives       20 years    
Buildings            
Property, plant and equipment, net            
Property, plant and equipment, gross 2,144     $ 2,144   2,175
Property, plant and equipment, Estimated useful lives       30 years    
Other depreciable assets            
Property, plant and equipment, net            
Property, plant and equipment, gross 5,632     $ 5,632   5,589
Other depreciable assets | Minimum            
Property, plant and equipment, net            
Property, plant and equipment, Estimated useful lives       3 years    
Other depreciable assets | Maximum            
Property, plant and equipment, net            
Property, plant and equipment, Estimated useful lives       15 years    
Land and rights of way            
Property, plant and equipment, net            
Property, plant and equipment, gross 9,027     $ 9,027   9,027
Construction in progress            
Property, plant and equipment, net            
Property, plant and equipment, gross $ 8     $ 8   $ 277
Gathering & Processing            
Property, plant and equipment, net            
Asset impairment   $ 78,300