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Property and Equipment | 12 Months Ended
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Dec. 31, 2021
Property, Plant and Equipment [Abstract] |
Property and Equipment |
7. | PROPERTY AND EQUIPMENT
Property and equipment are summarized as follows:
| As of December 31,
| 2021 |  | 2020
Construction and transportation equipment | $ | 315,756 |  |  | $ | 231,799 |
Buildings and improvements | 24,098 |  |  | 21,025 |
Land | 3,891 |  |  | 3,891 |
Office equipment | 3,839 |  |  | 3,012 |
Total property and equipment | 347,584 |  |  | 259,727 |
Less accumulated depreciation | (143,268) |  |  | (133,059) |
Total property and equipment, net | $ | 204,316 |  |  | $ | 126,668 |
Depreciation Expense—Depreciation expense is primarily included within cost of revenues and was $22,737, $21,349 and $16,045 for 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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