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COMMITMENTS AND CONTINGENCIES - NGL PURCHASE AGREEMENT (Details)
$ in Thousands
Sep. 30, 2017
USD ($)
Purchase Obligation, Fiscal Year Maturity [Abstract]  
2017 $ 234
2018 16,770
2019 23,400
2020 29,284
2021 30,214
2022 and thereafter 60,173
Total 160,075
Office Lease Commitments  
Purchase Obligation, Fiscal Year Maturity [Abstract]  
2017 234
2018 1,078
2019 1,224
2020 1,335
2021 1,423
2022 and thereafter 240
Total 5,534
NGL Commitments  
Purchase Obligation, Fiscal Year Maturity [Abstract]  
2017 0
2018 15,692
2019 22,176
2020 27,949
2021 28,791
2022 and thereafter 59,933
Total $ 154,541