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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2023
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, |  | 2023 |  | 2022
(in thousands) | ​ |  | ​ | ​ |  | ​
Land | ​ | $ | 18,165 | ​ | $ | 17,287
Buildings and leasehold improvements | ​ |  | 129,513 | ​ |  | 120,506
Operating equipment | ​ |  | 784,826 | ​ |  | 683,027
Computer software | ​ |  | 19,535 | ​ |  | 22,194
Furniture and fixtures | ​ |  | 5,298 | ​ |  | 5,480
Vehicles | ​ |  | 288,735 | ​ |  | 259,933
Gross property, plant and equipment | ​ |  | 1,246,072 | ​ |  | 1,108,427
Less: accumulated depreciation | ​ |  | (810,933) | ​ |  | (775,334)
Net property, plant and equipment | ​ | $ | 435,139 | ​ | $ | 333,093
​ Depreciation expense was $108.1 million in 2023, $83.0 million in 2022, and $72.7 million in 2021. The Company had accounts payable for purchases of property and equipment of $9.0 million as of December 31, 2023, and $9.3 million as of December 31, 2022. The Company transferred inventory to property, plant and equipment totaling $10.9 million in 2023 and $9.9 million in 2022.

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