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VARIABLE INTEREST ENTITIES - Cavalier (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 14, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Variable Interest Entities |  |  |  |
Distributions paid to Partners | $ 51,753 |  | $ 51,753 | $ 51,753
Cavalier Minerals | Alliance Minerals |  |  |  |
Variable Interest Entities |  |  |  |
Contributions |  | $ 143,112 |  |
Distributions paid to Partners |  | 92,780 |  |
Cavalier Minerals | Bluegrass Minerals |  |  |  |
Variable Interest Entities |  |  |  |
Contributions |  | 5,963 |  |
Distributions paid to Partners |  | $ 3,865 |  |
Cavalier Minerals | Bluegrass Minerals |  |  |  |
Variable Interest Entities |  |  |  |
Incentive distribution of available cash (as a percent) |  | 25.00% |  |
Cavalier Minerals |  |  |  |
Variable Interest Entities |  |  |  |
Ownership interest in VIE (as a percent) |  | 96.00% |  |
Cavalier Minerals | Bluegrass Minerals |  |  |  |
Variable Interest Entities |  |  |  |
Noncontrolling ownership interest (as a percent) |  | 4.00% |  |

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