Property, plant and equipment, net include the following (in thousands):
December 31,
Useful Life20252024
Machinery and equipment
7-20 years
$53,774 $114,366 
Aviation equipment(a)
3-10 years
43,498 3,742 
Buildings and leasehold improvements
15-39 years
30,100 38,039 
Drilling rigs and directional drilling equipment
3-15 years
13,062 96,120 
Vehicles, trucks and trailers
5-10 years
13,044 19,716 
Rail improvements
10-20 years
11,759 13,445 
LandN/A6,025 11,679 
Other property, plant and equipment
3-15 years
6,721 17,305 
177,983 314,412 
Equipment not yet placed in service25,970 3,094 
203,953 317,506 
Less: Accumulated depreciation(b)
97,856 250,855 
Total property, plant and equipment, net$106,097 $66,651 
a.This equipment relates to assets leased to customers under operating leases.
b.Includes accumulated depreciation of $5.7 million and $2.7 million at December 31, 2025 and 2024, respectively, related to assets under operating leases.

Historical Timeline

Fiscal YearFiled
2025Mar 6, 2026Showing above
2024Mar 7, 2025
2023Mar 1, 2024
2022Feb 24, 2023
2021Mar 4, 2022
2020Mar 1, 2021
2019Mar 2, 2020
2018Mar 18, 2019
2017Feb 28, 2018
2016Feb 24, 2017

About PP&E Disclosures

The PP&E disclosure details a company's physical asset base — land, buildings, machinery, and equipment — along with the depreciation methods and useful life assumptions that determine how these costs flow through the income statement. Capitalization policy thresholds reveal management's judgment on the boundary between expense and asset, directly affecting both reported earnings and asset values.

Key signals: changes in estimated useful lives or depreciation methods can materially shift reported earnings without any operational change. Compare capital expenditures against depreciation expense — when capex consistently trails depreciation, the asset base may be aging and underinvested. Watch for large asset impairments or write-downs that signal overvalued carrying amounts. Asset retirement obligations reveal future environmental or decommissioning costs that are often underappreciated. Compare PP&E intensity (PP&E-to-revenue) against industry peers to assess capital efficiency and competitive positioning.