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PROPERTY AND EQUIPMENT, Net | 12 Months Ended
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Dec. 31, 2021
PROPERTY AND EQUIPMENT, Net |
PROPERTY AND EQUIPMENT, Net | 8. PROPERTY AND EQUIPMENT, Net Property and equipment consist of the following at December 31: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 |  | 2020
Land | ​ | $ | 85,455 | ​ | $ | 85,876
Leasehold improvements | ​ |  | 11,845 | ​ |  | 11,524
Furniture and fixtures | ​ |  | 8,274 | ​ |  | 8,271
Office and computer equipment | ​ |  | 21,601 | ​ |  | 21,657
Computer software | ​ |  | 8,383 | ​ |  | 6,945
Equipment | ​ |  | 190,333 | ​ |  | 185,348
Buildings | ​ |  | 167,243 | ​ |  | 156,616
Vehicles | ​ |  | 45,404 | ​ |  | 43,173
​ | ​ |  | 538,538 | ​ |  | 519,410
Less: accumulated depreciation and amortization | ​ |  | (224,785) | ​ |  | (204,754)
​ | ​ | $ | 313,753 | ​ | $ | 314,656
​ Total depreciation and amortization expense recorded was $45.7 million, $49.3 million and $49.1 million for the years ended December 31, 2021, 2020 and 2019, respectively.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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