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INVESTMENTS (Tables) | 12 Months Ended
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Dec. 31, 2019
INVESTMENTS |
Schedule of changes in equity method investment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ | ​ | 2019 |  | 2018 |  | 2017
​ | ​ | (in thousands)
Beginning balance | ​ | $ | 28,974 | ​ | $ | 14,182 | ​ | $ | —
Contributions | ​ | ​ | — | ​ | ​ | 15,600 | ​ | ​ | 14,400
Equity method investment income (loss) | ​ | ​ | 2,203 | ​ | ​ | 547 | ​ | ​ | (218)
Distributions received | ​ | ​ | (2,648) | ​ | ​ | (1,355) | ​ | ​ | —
Ending balance | ​ | $ | 28,529 | ​ | $ | 28,974 | ​ | $ | 14,182

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