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PROPERTY AND EQUIPMENT, NET | 12 Months Ended
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Dec. 31, 2023
PROPERTY AND EQUIPMENT, Net |
PROPERTY AND EQUIPMENT, NET | 9. PROPERTY AND EQUIPMENT, Net Property and equipment consist of the following at December 31: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022
Land | ​ | $ | 152,253 | ​ | $ | 139,798
Leasehold improvements | ​ |  | 37,946 | ​ |  | 31,327
Furniture and fixtures | ​ |  | 11,422 | ​ |  | 9,286
Office and computer equipment | ​ |  | 25,560 | ​ |  | 22,386
Computer software | ​ |  | 5,344 | ​ |  | 5,906
Equipment | ​ |  | 426,466 | ​ |  | 244,739
Buildings | ​ |  | 211,951 | ​ |  | 163,885
Vehicles | ​ | ​ | 69,527 | ​ | ​ | 49,175
Assets under construction | ​ |  | 211,562 | ​ |  | 83,553
​ | ​ |  | 1,152,031 | ​ |  | 750,055
Less: accumulated depreciation and amortization | ​ |  | (261,235) | ​ |  | (233,158)
​ | ​ | $ | 890,796 | ​ | $ | 516,897
​ Total depreciation and amortization expense recorded was $63.0 million, $53.7 million and $45.7 million for the years ended December 31, 2023, 2022 and 2021, respectively. Assets under construction are not depreciated until in service date.

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