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EQUITY INVESTMENTS - Narrative (Details) a in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) a | Dec. 31, 2019 USD ($) | May 17, 2021 USD ($) | Dec. 31, 2020 USD ($) | Mar. 31, 2020 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity investments | $ 0 |  | $ 0 | $ 24,816,000 |
Investment in Grizzly Oil Sands ULC | Athabasca Peace River And Cold Lake Oil Sands Regions |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gas and oil area, reserve (acres) | a | 830 |  |  |  |
Investment in Grizzly Oil Sands ULC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity investment, ownership interest | 24.50% |  |  |  |
Amount of cash paid for equity investments |  | $ 0 |  |  |
Equity investments |  |  | $ 0 | $ 24,816,000 |
Mammoth Energy Partners LP |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity investment, ownership interest |  |  |  | 21.50% |
Equity investments |  |  |  | $ 0 | $ 0

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