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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2019
Property, Plant and Equipment |
Property, Plant and Equipment | Note 6: Property, Plant and Equipment Property, plant and equipment are presented at cost net of accumulated depreciation and consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, |  | 2019 |  | 2018
(in thousands) | ​ |  | ​ | ​ |  | ​
Land | ​ | $ | 18,945 | ​ | $ | 21,159
Buildings and leasehold improvements | ​ |  | 114,318 | ​ |  | 140,269
Operating equipment | ​ |  | 1,194,071 | ​ |  | 1,429,906
Computer software | ​ |  | 25,247 | ​ |  | 24,619
Furniture and fixtures | ​ |  | 7,086 | ​ |  | 7,606
Vehicles | ​ |  | 553,968 | ​ |  | 528,250
Gross property, plant and equipment | ​ |  | 1,913,635 | ​ |  | 2,151,809
Less: accumulated depreciation | ​ |  | (1,396,908) | ​ |  | (1,633,827)
Net property, plant and equipment | ​ | $ | 516,727 | ​ | $ | 517,982
​ Depreciation expense was $172.6 million in 2019, $166.2 million in 2018, and $166.9 million in 2017, and includes amounts recorded as costs of revenues. There were no capital leases outstanding as of December 31, 2019 and December 31, 2018. The Company had accounts payable for purchases of property and equipment of $6.8 million as of December 31, 2019, $14.8 million as of December 31, 2018, and $7.1 million as of December 31, 2017. The Company transferred inventory to property, plant and equipment totaling $20.8 million in 2019 and $23.1 million in 2018.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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