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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 | Property and Equipment Property and equipment consisted of the following at December 31:
(dollars in thousands) |  | Estimated Useful Life in Years |  | 2023 |  | 2022
Land |  | — |  | $ | 10,351 |  |  | $ | 10,226 |
Buildings and improvements |  | 3 to 39 |  | 44,352 |  |  | 40,480 |
Construction equipment |  | 3 to 12 |  | 578,563 |  |  | 519,421 |
Office equipment |  | 3 to 10 |  | 16,177 |  |  | 14,801 |
|  |  |  | 649,443 |  |  | 584,928 |
Less: accumulated depreciation and amortization |  |  |  | (380,465) |  |  | (351,753) |
|  |  |  | $ | 268,978 |  |  | $ | 233,175 |
Construction equipment includes assets under finance leases — see additional information provided in Note 4 — Lease Obligations to the Financial Statements. Depreciation and amortization expense of property and equipment for the years ended December 31, 2023, 2022 and 2021 was $54.2 million, $49.2 million and $43.9 million, 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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