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PROPERTY AND EQUIPMENT, NET | 12 Months Ended
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Dec. 31, 2020
PROPERTY AND EQUIPMENT, NET |
PROPERTY AND EQUIPMENT, NET | 8. PROPERTY AND EQUIPMENT, Net Property and equipment consist of the following at December 31: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020 |  | 2019
Land | ​ | $ | 85,876 | ​ | $ | 78,275
Leasehold improvements | ​ |  | 11,524 | ​ |  | 10,417
Furniture and fixtures | ​ |  | 8,271 | ​ |  | 8,426
Office and computer equipment | ​ |  | 21,657 | ​ |  | 22,766
Computer software | ​ |  | 6,945 | ​ |  | 4,450
Equipment | ​ |  | 185,348 | ​ |  | 214,293
Buildings | ​ |  | 156,616 | ​ |  | 126,338
Vehicles | ​ |  | 43,173 | ​ |  | 41,109
​ | ​ |  | 519,410 | ​ |  | 506,074
Less: accumulated depreciation and amortization | ​ |  | (204,754) | ​ |  | (207,434)
​ | ​ | $ | 314,656 | ​ | $ | 298,640
​ Total depreciation and amortization expense recorded was $49.3 million, $49.1 million and $45.0 million for the years ended December 31, 2020, 2019 and 2018, respectively.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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