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PROPERTY AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2020
PROPERTY AND EQUIPMENT | 7. PROPERTY AND EQUIPMENT Property and equipment, net, consists of:
December 31, |  | 2020 |  |  | 2019 |
Land |  | $ | 741 |  |  | $ | 741 |
Buildings and improvements |  |  | 80,877 |  |  |  | 81,938 |
Machinery, vehicles , and equipment |  |  | 92,577 |  |  |  | 86,639 |
Computer hardware and software |  |  | 62,776 |  |  |  | 56,227 |
Furniture and fixtures |  |  | 19,077 |  |  |  | 18,049 |
|  |  | 256,048 |  |  |  | 243,594 |
Accumulated depreciation and amortization |  |  | (157,823 | ) |  |  | (145,071 | )
|  | $ | 98,225 |  |  | $ | 98,523 |
Depreciation and amortization expense related to property and equipment included in selling, general and administrative expenses for the years ended December 31, 2020, 2019 , and 2018, were $19,963, $18,808 , and $16,747, 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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