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PROPERTY AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2017
PROPERTY AND EQUIPMENT | 5. PROPERTY AND EQUIPMENT Property and equipment, net, consists of:
December 31, |  | 2017 |  |  | 2016 |
Land |  | $ | 820 |  |  | $ | 820 |
Buildings and improvements |  |  | 74,486 |  |  |  | 71,082 |
Machinery, vehicles and equipment |  |  | 76,117 |  |  |  | 74,640 |
Furniture and fixtures |  |  | 15,282 |  |  |  | 15,090 |
Computer hardware and software |  |  | 47,377 |  |  |  | 42,515 |
|  |  | 214,082 |  |  |  | 204,147 |
Accumulated depreciation and amortization |  |  | (122,884 | ) |  |  | (113,645 | )
|  | $ | 91,198 |  |  | $ | 90,502 |
Depreciation and amortization expense related to property and equipment included in selling, general and administrative expenses for the years ended December 31, 2017, 2016 and 2015, were $16,770, $14,853 and $13,802, 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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