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INVESTMENTS (Tables) | 12 Months Ended
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Dec. 31, 2022
All Dale Minerals III |
INVESTMENTS |
Schedule of changes in equity method investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ | ​ | 2022 |  | 2021 |  | 2020
​ | ​ | (in thousands)
Beginning balance | ​ | $ | 26,325 | ​ | $ | 27,268 | ​ | $ | 28,529
Equity method investment income | ​ | ​ | 5,634 | ​ | ​ | 2,130 | ​ | ​ | 907
Distributions received | ​ | ​ | (6,675) | ​ | ​ | (3,073) | ​ | ​ | (1,895)
Other | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (273)
Ending balance | ​ | $ | 25,284 | ​ | $ | 26,325 | ​ | $ | 27,268
​
Francis Renewable Energy |
INVESTMENTS |
Schedule of changes in equity method investments | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Year Ended December 31, | ​
​ |  | ​ | 2022 |
​ | ​ | ​ | (in thousands) | ​
Beginning balance | ​ | ​ | $ | — | ​
Contributions | ​ | ​ | ​ | 20,000 | ​
Ending balance | ​ | ​ | $ | 20,000 | ​
​
Infinitum Electric |
INVESTMENTS |
Schedule of changes in equity securities without readily determinable fair value | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Year Ended December 31, | ​
​ |  | ​ | 2022 | ​
​ | ​ | ​ | (in thousands) | ​
Beginning balance | ​ | ​ | $ | — | ​
Contributions | ​ | ​ | ​ | 42,000 | ​
Ending balance | ​ | ​ | $ | 42,000 | ​
​
NGP ETP |
INVESTMENTS |
Schedule of changes in equity method investments | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Year Ended December 31, | ​
​ |  | ​ | 2022 | ​
​ | ​ | ​ | (in thousands) | ​
Beginning balance | ​ | ​ | $ | — | ​
Contributions | ​ | ​ | ​ | 4,087 | ​
Ending balance | ​ | ​ | $ | 4,087 | ​
​

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