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Properties And Equipment | 12 Months Ended
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Dec. 31, 2023
Properties And Equipment [Abstract] |
Properties And Equipment | 13. Properties and Equipment A summary of properties and equipment follows (in thousands):
|  | December 31,
|  | 2023 |  |  | 2022
Land | $ | 14,356 |  | $ | 11,862
Buildings and building improvements |  | 130,695 |  |  | 123,845
Transportation equipment |  | 89,910 |  |  | 79,810
Machinery and equipment |  | 164,249 |  |  | 154,603
Computer software |  | 72,646 |  |  | 69,283
Furniture and fixtures |  | 78,068 |  |  | 76,042
Projects under development |  | 8,788 |  |  | 20,189
Total properties and equipment |  | 558,712 |  |  | 535,634
Less accumulated depreciation |  | (354,872) |  |  | (335,920)
Net properties and equipment | $ | 203,840 |  | $ | 199,714
The net book value of computer software at December 31, 2023 and 2022, was $8.0 million and $8.9 million, respectively. Depreciation expense for computer software was $4.5 million, $5.5 million and $5.8 million for the years ended December 31, 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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