Major classes of property, plant and equipment were as follows:
 December 31, 2025December 31, 2024
 (U.S. Dollars in thousands)
Land and land improvements
$513,470 $524,205 
Buildings and leasehold improvements
333,400 333,536 
Machinery and equipment
387,102 339,594 
Computer software
92,167 77,124 
Vessels and containers
253,476 206,174 
Machinery and equipment and vessel containers under finance leases
79,487 100,116 
Construction in progress
42,260 41,679 
 Property, plant and equipment, gross1,701,362 1,622,428 
Accumulated depreciation
(619,706)(502,062)
Property, plant and equipment, net$1,081,656 $1,120,366 

There is approximately $34.2 million of property, plant and equipment, net that was excluded from the Vegetables Transaction that are being leased to third parties. The amounts are primarily comprised of land and land improvements and buildings and leasehold improvements.

Depreciation is computed using the straight-line method over the estimated useful lives of the assets as follows:
 
Years
Land improvements
1 to 25
Buildings and leasehold improvements*
2 to 40
Machinery and equipment
1 to 25
Computer software
1 to 7
Vessels and containers
1 to 30
Machinery and equipment and vessel containers under finance leases
Shorter of lease term or useful life
*Leasehold improvements are depreciated using the shorter of the useful life or life of the lease.

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.