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OPERATING REVENUES - Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Disaggregation of operating revenue |  |  |  |  |
Total oil, natural gas and natural gas liquids sales | $ 55,307 |  | $ 104,407 |  |
Other | 108 | $ 190 | 263 | $ 1,023 |
Total operating revenues | 55,415 | 120,137 | 104,670 | 255,735 |
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |
Disaggregation of operating revenue |  |  |  |  |
Total oil, natural gas and natural gas liquids sales |  | 119,947 |  | 254,712 |
Other |  | 190 |  | 1,023 |
Total operating revenues |  | 120,137 |  | 255,735 |
Oil |  |  |  |  |
Disaggregation of operating revenue |  |  |  |  |
Total oil, natural gas and natural gas liquids sales | 48,756 |  | 91,825 |  |
Total operating revenues | 48,756 | 108,695 | 91,825 | 231,216 |
Oil | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |
Disaggregation of operating revenue |  |  |  |  |
Total oil, natural gas and natural gas liquids sales |  | 108,695 |  | 231,216 |
Natural gas |  |  |  |  |
Disaggregation of operating revenue |  |  |  |  |
Total oil, natural gas and natural gas liquids sales | 1,560 |  | 3,879 |  |
Total operating revenues | 1,560 | 5,946 | 3,879 | 12,165 |
Natural gas | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |
Disaggregation of operating revenue |  |  |  |  |
Total oil, natural gas and natural gas liquids sales |  | 5,946 |  | 12,165 |
Natural gas liquids |  |  |  |  |
Disaggregation of operating revenue |  |  |  |  |
Total oil, natural gas and natural gas liquids sales | 4,991 |  | 8,703 |  |
Total operating revenues | 4,991 | 5,306 | 8,703 | 11,331 |
Natural gas liquids | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |
Disaggregation of operating revenue |  |  |  |  |
Total oil, natural gas and natural gas liquids sales |  | $ 5,306 |  | $ 11,331 |
Accounts Receivable |  |  |  |  |
Disaggregation of operating revenue |  |  |  |  |
Due from contracts with customers | $ 29,400 |  | $ 29,400 |  | $ 24,100

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