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OPERATING REVENUES - Adoption of ASC 606, Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Operating revenues |  |  |  |
Gathering and other expense | $ 5,956 | $ 11,812 | $ 12,378 | $ 23,754
Adjustments due to ASU 201409 | ASU 201409 |  |  |  |
Operating revenues |  |  |  |
Cumulative effect of applying ASC 606 |  |  | 0 |
Oil, natural gas and natural gas liquids sales | 200 |  | 400 |
Gathering and other expense | $ 200 |  | $ 400 |

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