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FAIR VALUE MEASUREMENTS - NARRATIVE (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Apr. 01, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Proved oil and gas property impairments | $ 0 | $ 0 | $ 0 | $ 0 |
HighPoint Merger | Senior Notes Due 2026, 7.50% | Senior Notes |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Interest rate |  |  |  |  | 7.50%
Aggregate principal amount |  |  |  |  | $ 100,000,000
Debt issuance costs, discounts or premiums |  |  |  |  | $ 0
HighPoint Merger | Senior Notes Due 2026, 7.50% | Senior Notes | Level 1 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt, estimated fair value | $ 100,800,000 |  | $ 100,800,000 |  |

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