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PROPERTY, PLANT AND EQUIPMENT
 9 Months Ended
Sep. 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):
September 30, 2024December 31, 2023
Land$186,984 $174,891 
Asset retirement costs (non-landfill)28,935 27,167 
Landfill assets259,233 253,180 
Buildings and improvements (1)
649,401 630,525 
Vehicles (2)
1,430,325 1,276,567 
Equipment (3)
2,453,616 2,388,370 
Construction in progress316,666 213,601 
5,325,160 4,964,301 
Less - accumulated depreciation and amortization2,872,848 2,770,983 
Total property, plant and equipment, net$2,452,312 $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 $208.7 million and $151.7 million, respectively.
(3) Balances inclusive of gross ROU assets classified as finance leases of $9.3 million and $9.2 million, respectively.
Depreciation expense, inclusive of landfill and finance lease amortization, was $86.2 million and $254.9 million for the three and nine months ended September 30, 2024, respectively. Depreciation expense, inclusive of landfill and finance lease amortization, was $80.4 million and $229.7 million for the three and nine months ended September 30, 2023, respectively. The Company recorded $3.3 million and $8.6 million of capitalized interest during the three and nine months ended September 30, 2024, respectively. The Company recorded $1.7 million and $4.4 million of capitalized interest during the three and nine months ended September 30, 2023, respectively. Capitalized interest in the periods presented is primarily attributable to the construction of a new incinerator in Kimball, Nebraska.