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INVESTMENTS - AllDale (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
ASSETS |  |  |
Beginning balance | $ 28,529 |  |
Equity method investment income | 907 | $ 2,203 | $ 22,189
Ending balance | 27,268 | 28,529 |
All Dale Minerals III |  |  |
ASSETS |  |  |
Beginning balance | 28,529 | 28,974 | 14,182
Contributions |  |  | 15,600
Equity method investment income | 907 | 2,203 | 547
Distributions received | (1,895) | (2,648) | (1,355)
Other | (273) |  |
Ending balance | $ 27,268 | $ 28,529 | $ 28,974

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