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OPERATING REVENUES - Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Disaggregation of operating revenue |  |  |  |  |
Total oil, natural gas and natural gas liquids sales | $ 61,245 |  | $ 165,652 |  |
Other | 350 | $ 363 | 613 | $ 1,386 |
Total operating revenues | 61,595 | 96,953 | 166,265 | 352,688 |
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |
Disaggregation of operating revenue |  |  |  |  |
Total oil, natural gas and natural gas liquids sales |  | 96,590 |  | 351,302 |
Other |  | 363 |  | 1,386 |
Total operating revenues |  | 96,953 |  | 352,688 |
Oil |  |  |  |  |
Disaggregation of operating revenue |  |  |  |  |
Total oil, natural gas and natural gas liquids sales | 53,918 |  | 145,743 |  |
Total operating revenues | 53,918 | 88,256 | 145,743 | 319,472 |
Oil | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |
Disaggregation of operating revenue |  |  |  |  |
Total oil, natural gas and natural gas liquids sales |  | 88,256 |  | 319,472 |
Natural gas |  |  |  |  |
Disaggregation of operating revenue |  |  |  |  |
Total oil, natural gas and natural gas liquids sales | 1,407 |  | 5,286 |  |
Total operating revenues | 1,407 | 2,886 | 5,286 | 15,051 |
Natural gas | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |
Disaggregation of operating revenue |  |  |  |  |
Total oil, natural gas and natural gas liquids sales |  | 2,886 |  | 15,051 |
Natural gas liquids |  |  |  |  |
Disaggregation of operating revenue |  |  |  |  |
Total oil, natural gas and natural gas liquids sales | 5,920 |  | 14,623 |  |
Total operating revenues | 5,920 | 5,448 | 14,623 | 16,779 |
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 |  | $ 5,448 |  | $ 16,779 |
Accounts receivable |  |  |  |  |
Disaggregation of operating revenue |  |  |  |  |
Due from contracts with customers | $ 37,100 |  | $ 37,100 |  | $ 24,100

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