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EQUITY INVESTMENTS (Tables) | 12 Months Ended
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Dec. 31, 2023
All Dale Minerals III |
Investments |
Schedule of changes in equity method investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ | ​ | 2023 |  | 2022 |  | 2021
​ | ​ | (in thousands)
Beginning balance | ​ | $ | 25,284 | ​ | $ | 26,325 | ​ | $ | 27,268
Equity method investment income | ​ | ​ | 2,567 | ​ | ​ | 5,634 | ​ | ​ | 2,130
Distributions received | ​ | ​ | (3,918) | ​ | ​ | (6,675) | ​ | ​ | (3,073)
Ending balance | ​ | $ | 23,933 | ​ | $ | 25,284 | ​ | $ | 26,325
Francis Renewable Energy |
Investments |
Schedule of changes in equity method investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, | ​
​ | ​ | 2023 |  | 2022 |
​ | ​ | (in thousands) | ​
Beginning balance | ​ | $ | 20,000 | ​ | $ | — | ​
Contributions | ​ | ​ | — | ​ | ​ | 20,000 | ​
Equity method investment loss | ​ | ​ | (3,513) | ​ | ​ | — | ​
Ending balance | ​ | $ | 16,487 | ​ | $ | 20,000 | ​
NGP ET IV |
Investments |
Schedule of changes in equity method investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, | ​
​ | ​ | 2023 |  | 2022 | ​
​ | ​ | (in thousands) | ​
Beginning balance | ​ | $ | 4,087 | ​ | $ | — | ​
Contributions | ​ | ​ | 2,518 | ​ | ​ | 4,087 | ​
Equity method investment loss | ​ | ​ | (522) | ​ | ​ | — | ​
Ending balance | ​ | $ | 6,083 | ​ | $ | 4,087 | ​

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