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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognized (Details) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 USD ($) product | Dec. 31, 2020 USD ($)
Accounting Policies [Abstract] |  |
Number of primary products | product | 2 |
Contract cash settlement max days | 25 days |
Contract cancellable notice term | 30 days |
Oil and gas sales | $ | $ 213,661 | $ 125,016

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