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VARIABLE INTEREST ENTITIES (Tables) | 12 Months Ended
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Dec. 31, 2020
VARIABLE INTEREST ENTITIES |
Schedule of distributions | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Alliance | ​ | Bluegrass
​ | ​ | Minerals | ​ | Minerals
​ | ​ | (in thousands)
Contributions | ​ | $ | 143,112 | ​ | $ | 5,963
Distributions | ​ | ​ | 89,380 | ​ | ​ | 3,723

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