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OPERATING REVENUES - Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Disaggregation of operating revenue |  |  |  |  |
Total oil, natural gas and natural gas liquids sales | $ 80,504 | $ 39,446 | $ 199,873 | $ 104,501 |
Other | 312 | 384 | 827 | 1,222 |
Total operating revenues | 80,816 | 39,830 | 200,700 | 105,723 |
Total oil, natural gas and natural gas liquids sales |  |  |  |  |
Disaggregation of operating revenue |  |  |  |  |
Total oil, natural gas and natural gas liquids sales | 80,504 | 39,446 | 199,873 | 104,501 |
Oil |  |  |  |  |
Disaggregation of operating revenue |  |  |  |  |
Total oil, natural gas and natural gas liquids sales | 60,023 | 33,638 | 153,228 | 91,313 |
Natural gas |  |  |  |  |
Disaggregation of operating revenue |  |  |  |  |
Total oil, natural gas and natural gas liquids sales | 9,435 | 1,912 | 23,839 | 3,102 |
NGLs |  |  |  |  |
Disaggregation of operating revenue |  |  |  |  |
Total oil, natural gas and natural gas liquids sales | 11,046 | $ 3,896 | 22,806 | $ 10,086 |
Accounts receivable |  |  |  |  |
Disaggregation of operating revenue |  |  |  |  |
Due from contracts with customers | $ 38,600 |  | $ 38,600 |  | $ 24,500

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