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INVESTMENTS - AllDale (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Changes in equity method investment |  |  |  |
Beginning balance |  |  | $ 28,529 |
Equity method investment income | $ 62 | $ 659 | 650 | $ 1,533
Ending balance | 27,415 |  | 27,415 |
All Dale Minerals III |  |  |  |
Changes in equity method investment |  |  |  |
Beginning balance | 27,705 | 28,672 | 28,529 | 28,974
Equity method investment income | 62 | 659 | 650 | 1,533
Distributions received | (352) | (610) | (1,491) | (1,786)
Other |  |  | (273) |
Ending balance | $ 27,415 | $ 28,721 | $ 27,415 | $ 28,721

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