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Property and Equipment | 12 Months Ended
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Dec. 31, 2023
Property and Equipment |
Property and Equipment | 7. Property and Equipment Property and equipment consist of the following (dollars in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Estimated | ​ | ​ | ​ | ​ | ​ | ​ |
​ |  | Useful Lives |  | December 31, |
​ |  | in Years |  | 2023 |  | 2022 |
Land |  | — | ​ | $ | 8,437 | ​ | $ | 6,792 | ​
Transportation equipment |  | 1 - 7 | ​ |  | 188,073 | ​ |  | 153,587 | ​
Machinery and equipment |  | 1 - 20 | ​ |  | 77,142 | ​ |  | 56,357 | ​
Computer and telephone equipment |  | 1 - 10 | ​ |  | 29,052 | ​ |  | 23,551 | ​
Buildings and leasehold improvements |  | 1 - 40 | ​ |  | 101,568 | ​ |  | 80,275 | ​
Furniture and fixtures |  | 1 - 17 | ​ | ​ | 8,600 | ​ | ​ | 6,270 | ​
Construction in progress |  | — | ​ |  | 12,645 | ​ |  | 6,717 | ​
​ | ​ | ​ | ​ |  | 425,517 | ​ |  | 333,549 | ​
Less—Accumulated depreciation | ​ | ​ | ​ |  | (216,949) | ​ |  | (189,600) | ​
Property and equipment, net | ​ | ​ | ​ | $ | 208,568 | ​ | $ | 143,949 | ​
​ Depreciation expense for the years ended December 31, 2023, 2022 and 2021 was $38.2 million, $33.6 million and $28.4 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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