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OPERATING REVENUES - Revenue Recognition (Details) - USD ($) $ in Thousands | 1 Months Ended | 2 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 31, 2019 | Dec. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Disaggregation of operating revenue |  |  |  |  |  |  |
Financial Designation, Predecessor and Successor [Fixed List] | Successor | Successor | Successor | Predecessor | Successor | Predecessor | Successor
Total oil, natural gas and natural gas liquids sales |  |  | $ 18,031 | $ 55,874 | $ 65,055 | $ 107,797 |
Other |  |  | 463 | 504 | 838 | 497 |
Total operating revenues |  |  | 18,494 | 56,378 | 65,893 | 108,294 |
Total oil, natural gas and natural gas liquids sales |  |  |  |  |  |  |
Disaggregation of operating revenue |  |  |  |  |  |  |
Total oil, natural gas and natural gas liquids sales |  |  | 18,031 | 55,874 | 65,055 | 107,797 |
Oil |  |  |  |  |  |  |
Disaggregation of operating revenue |  |  |  |  |  |  |
Total oil, natural gas and natural gas liquids sales |  |  | 15,758 | 53,232 | 57,675 | 98,749 |
Natural gas |  |  |  |  |  |  |
Disaggregation of operating revenue |  |  |  |  |  |  |
Total oil, natural gas and natural gas liquids sales |  |  | 836 | (1,655) | 1,190 | (194) |
Natural gas liquids |  |  |  |  |  |  |
Disaggregation of operating revenue |  |  |  |  |  |  |
Total oil, natural gas and natural gas liquids sales |  |  | 1,437 | $ 4,297 | 6,190 | $ 9,242 |
Accounts receivable |  |  |  |  |  |  |
Disaggregation of operating revenue |  |  |  |  |  |  |
Due from contracts with customers |  | $ 36,400 | $ 18,400 |  | $ 18,400 |  | $ 36,400

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