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VARIABLE INTEREST ENTITIES - Cavalier (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 03, 2019
Variable Interest Entities |  |  |  |
Contributions |  |  | $ 2,142 |
Distributions paid to Partners | $ 51,753 | $ 278,425 | $ 275,902 |
Cavalier Minerals | Alliance Minerals |  |  |  |
Variable Interest Entities |  |  |  |
Contributions | 143,112 |  |  |
Distributions paid to Partners | 89,380 |  |  |
Cavalier Minerals | Bluegrass Minerals |  |  |  |
Variable Interest Entities |  |  |  |
Contributions | 5,963 |  |  |
Distributions paid to Partners | $ 3,723 |  |  |
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% |  |  | 4.00%

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