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Property and Equipment | 12 Months Ended
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Dec. 31, 2017
Property and Equipment |
Property and Equipment | 3. PROPERTY & EQUIPMENT The following table sets forth our property and equipment by class as of December 31, 2017 and 2016, in thousands:
|  | As of December 31,
|  | 2017 |  | 2016
Land and improvements |  | $ | 7,846 |  | $ | 7,907
Buildings |  |  | 40,515 |  |  | 38,865
Equipment |  |  | 96,580 |  |  | 88,472
Computer hardware and software |  |  | 125,984 |  |  | 123,725
Company vehicles |  |  | 41,298 |  |  | 34,668
|  |  | 312,223 |  |  | 293,637
Less: Accumulated depreciation |  |  | (205,102) |  |  | (200,877)
Total property and equipment, net |  | $ | 107,121 |  | $ | 92,760
Depreciation expense was $13.5 million, $11.2 million, and $11.1 million for the years ended December 31, 2017, 2016, and 2015, 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13-14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2921-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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