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Property and Equipment | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Property and Equipment |
7. | PROPERTY AND EQUIPMENT
Property and equipment are summarized as follows:
| As of December 31,
| 2020 |  | 2019
Construction and transportation equipment | $ | 231,799 |  |  | $ | 217,945 |
Buildings and improvements | 21,025 |  |  | 14,641 |
Land | 3,891 |  |  | 3,891 |
Office equipment | 3,012 |  |  | 2,767 |
Total property and equipment | 259,727 |  |  | 239,244 |
Less accumulated depreciation | (133,059) |  |  | (123,214) |
Total property and equipment, net | $ | 126,668 |  |  | $ | 116,030 |
Depreciation Expense—Depreciation expense is primarily included within cost of revenues and was approximately $21,300, $16,000 and $14,400 for 2020, 2019 and 2018, 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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