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OPERATING REVENUES - Adoption of ASC 606, Revenue from Contracts with Customers (Details) - USD ($)
$ in Thousands
4 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Operating revenues      
Gathering and other expense $ (14,677) $ (60,090) $ (40,783)
Adjustments due to ASU 201409 | ASU 201409      
Operating revenues      
Cumulative effect of applying ASC 606   0  
Oil, natural gas and natural gas liquids sales   1,100  
Gathering and other expense   $ 1,100