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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2022
Property, Plant and Equipment |
Property, Plant and Equipment | Note 7: Property, Plant and Equipment Property, plant and equipment are presented at cost net of accumulated depreciation and consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, |  | 2022 |  | 2021
(in thousands) | ​ |  | ​ | ​ |  | ​
Land | ​ | $ | 17,287 | ​ | $ | 18,180
Buildings and leasehold improvements | ​ |  | 120,506 | ​ |  | 120,649
Operating equipment | ​ |  | 683,027 | ​ |  | 606,089
Computer software | ​ |  | 22,194 | ​ |  | 22,925
Furniture and fixtures | ​ |  | 5,480 | ​ |  | 6,222
Vehicles | ​ |  | 259,933 | ​ |  | 243,647
Gross property, plant and equipment | ​ |  | 1,108,427 | ​ |  | 1,017,712
Less: accumulated depreciation | ​ |  | (775,334) | ​ |  | (763,304)
Net property, plant and equipment | ​ | $ | 333,093 | ​ | $ | 254,408
​ Depreciation expense was $83.0 million in 2022, $72.7 million in 2021, and $95.5 million in 2020. The Company had accounts payable for purchases of property and equipment of $9.3 million as of December 31, 2022 and $4.3 million as of December 31, 2021. The Company transferred inventory to property, plant and equipment totaling $9.9 million in 2022 and $11.1 million in 2021.

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=126982197&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI https://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126982197&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126982197&loc=d3e99779-112916 + Details
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