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Property and Equipment | 12 Months Ended
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Dec. 31, 2022
Property, Plant and Equipment [Abstract] |
Property and Equipment |
8. | PROPERTY AND EQUIPMENT
Property and equipment are summarized as follows:
| As of December 31,
| 2022 |  | 2021
Construction and transportation equipment | $ | 345,647 |  |  | $ | 296,718 |
Buildings and improvements | 20,500 |  |  | 19,072 |
Land | 3,402 |  |  | 3,402 |
Office equipment | 3,352 |  |  | 3,119 |
Total property and equipment | 372,901 |  |  | 322,311 |
Less accumulated depreciation | (157,419) |  |  | (128,415) |
Total property and equipment, net | $ | 215,482 |  |  | $ | 193,896 |
Depreciation Expense—Depreciation expense is primarily included within cost of revenues and was $36,475, $21,039 and $19,739 for 2022, 2021 and 2020, 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 https://asc.fasb.org/extlink&oid=126982197&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI https://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 https://asc.fasb.org/extlink&oid=126982197&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 https://asc.fasb.org/extlink&oid=126982197&loc=d3e99779-112916 + Details
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