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PROPERTY, PLANT AND EQUIPMENT
 6 Months Ended
Jun. 30, 2024
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment consisted of the following (in thousands):
June 30, 2024December 31, 2023
Land$184,045 $174,891 
Asset retirement costs (non-landfill)27,127 27,167 
Landfill assets253,401 253,180 
Buildings and improvements (1)
647,529 630,525 
Vehicles (2)
1,396,240 1,276,567 
Equipment (3)
2,436,769 2,388,370 
Construction in progress288,007 213,601 
5,233,118 4,964,301 
Less - accumulated depreciation and amortization2,824,471 2,770,983 
Total property, plant and equipment, net$2,408,647 $2,193,318 
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(1) Balances inclusive of gross right-of-use (“ROU”) assets classified as finance leases of $8.0 million in both periods.
(2) Balances inclusive of gross ROU assets classified as finance leases of $205.8 million and $151.7 million, respectively.
(3) Balances inclusive of gross ROU assets classified as finance leases of $9.2 million in both periods.
Depreciation expense, inclusive of landfill and finance lease amortization, was $86.5 million and $168.7 million for the three and six months ended June 30, 2024, respectively. Depreciation expense, inclusive of landfill and finance lease amortization, was $77.2 million and $149.2 million for the three and six months ended June 30, 2023, respectively. The Company recorded $2.9 million and $5.3 million of capitalized interest during the three and six months ended June 30, 2024, respectively. The Company recorded $1.4 million and $2.7 million of capitalized interest during the three and six months ended June 30, 2023, respectively. Capitalized interest in the periods presented is primarily attributable to the construction of a new incinerator in Kimball, Nebraska.