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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2023
Summary of Significant Accounting Policies |
Components of self-insurance reserves | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2023 |  | 2022
Self-insurance reserves (undiscounted) | ​ | $ | 225,740 | ​ | $ | 245,562
Self-insurance reserves (discounted) | ​ |  | 214,116 | ​ |  | 233,017

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