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VARIABLE INTEREST ENTITIES (Tables) | 12 Months Ended
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Dec. 31, 2019
VARIABLE INTEREST ENTITIES |
Schedule of distributions | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Alliance | ​ | Bluegrass | ​
​ | ​ | Minerals | ​ | Minerals | ​
​ | ​ | (in thousands) | ​
Contributions | ​ | $ | 143,112 | ​ | $ | 5,963 | ​
Distributions | ​ | ​ | 71,916 | ​ | ​ | 2,996 | ​

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