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FAIR VALUE MEASUREMENTS (Tables) | 12 Months Ended
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Dec. 31, 2022
FAIR VALUE MEASUREMENTS |
Summary of fair value measurements within the hierarchy | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022 | ​ | December 31, 2021 | ​
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Level 1 |  | Level 2 |  | Level 3 |
​ | ​ | (in thousands) | ​
Long-term debt | ​ | $ | — | ​ | $ | 424,420 | ​ | $ | — | ​ | $ | — | ​ | $ | 457,758 | ​ | $ | — | ​
Total | ​ | $ | — | ​ | $ | 424,420 | ​ | $ | — | ​ | $ | — | ​ | $ | 457,758 | ​ | $ | — | ​
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