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VARIABLE INTEREST ENTITIES (Tables) | 6 Months Ended
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Jun. 30, 2020
VARIABLE INTEREST ENTITIES |
Schedule of distributions | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Alliance | ​ | Bluegrass | ​
​ | ​ | Minerals | ​ | Minerals | ​
​ | ​ | (in thousands) | ​
Contributions | ​ | $ | 143,112 | ​ | $ | 5,963 | ​
Distributions | ​ | ​ | 84,153 | ​ | ​ | 3,505 | ​

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