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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2024
Property, Plant and Equipment |
Property, Plant and Equipment | Note 8: Property, Plant and Equipment Property, plant and equipment are presented at cost net of accumulated depreciation and consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, |  | 2024 |  | 2023
(in thousands) | ​ |  | ​ | ​ |  | ​
Land | ​ | $ | 19,802 | ​ | $ | 18,165
Buildings and leasehold improvements | ​ |  | 132,871 | ​ |  | 129,513
Operating equipment | ​ |  | 884,793 | ​ |  | 784,826
Computer software | ​ |  | 19,297 | ​ |  | 19,535
Furniture and fixtures | ​ |  | 5,157 | ​ |  | 5,298
Vehicles | ​ |  | 311,823 | ​ |  | 288,735
Gross property, plant and equipment | ​ |  | 1,373,743 | ​ |  | 1,246,072
Less: accumulated depreciation | ​ |  | (860,227) | ​ |  | (810,933)
Net property, plant and equipment | ​ | $ | 513,516 | ​ | $ | 435,139
​ Depreciation expense was $130.5 million in 2024, $107.3 million in 2023, and $82.2 million in 2022. The Company transferred inventory to property, plant and equipment totaling $17.0 million in 2024 and $10.9 million in 2023 and $9.9 million in 2022.

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