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PROPERTY AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2023
Property, Plant and Equipment [Abstract] |
PROPERTY AND EQUIPMENT |
8. | PROPERTY AND EQUIPMENT
Property and equipment are summarized as follows:
| As of December 31,
| 2023 |  | 2022
Construction and transportation equipment | $ | 405,242 |  |  | $ | 345,647 |
Buildings and improvements | 21,325 |  |  | 20,500 |
Land | 3,054 |  |  | 3,402 |
Office equipment | 4,023 |  |  | 3,352 |
Total property and equipment | 433,644 |  |  | 372,901 |
Less accumulated depreciation | (189,996) |  |  | (157,419) |
Total property and equipment, net | $ | 243,648 |  |  | $ | 215,482 |
Depreciation Expense—Depreciation expense is primarily included within cost of revenues and was $42,177, $36,475 and $21,039 for 2023, 2022 and 2021, 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://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-7 + Details
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