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INVESTMENTS - AllDale (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Changes in equity method investment |  |  |  |
Beginning balance |  |  | $ 28,529 |
Equity method investment income | $ 137 | $ 550 | 588 | $ 874
Ending balance | 27,705 |  | 27,705 |
All Dale Minerals III |  |  |  |
Changes in equity method investment |  |  |  |
Beginning balance | 28,114 | 28,770 | 28,529 | 28,974
Equity method investment income | 137 | 550 | 588 | 874
Distributions received | (546) | (648) | (1,139) | (1,176)
Other |  |  | (273) |
Ending balance | $ 27,705 | $ 28,672 | $ 27,705 | $ 28,672

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