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INVESTMENT - AllDale (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
ASSETS |  |  |  |
Beginning balance |  |  | $ 27,268 |
Equity method investment income | $ 341 | $ 137 | 403 | $ 588
Ending balance | 26,274 |  | 26,274 |
All Dale Minerals III |  |  |  |
ASSETS |  |  |  |
Beginning balance | 26,907 | 28,114 | 27,268 | 28,529
Equity method investment income | 341 | 137 | 403 | 588
Distributions received | (974) | (546) | (1,397) | (1,139)
Other |  |  |  | (273)
Ending balance | $ 26,274 | $ 27,705 | $ 26,274 | $ 27,705

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