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PROPERTY, PLANT AND EQUIPMENT
 9 Months Ended
Sep. 30, 2023
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, 2023December 31, 2022
Land$174,598 $172,579 
Asset retirement costs (non-landfill)27,100 22,001 
Landfill assets247,822 232,872 
Buildings and improvements (1)
622,059 591,397 
Vehicles (2)
1,214,945 1,112,188 
Equipment (3)
2,343,272 2,195,064 
Construction in progress191,311 140,328 
4,821,107 4,466,429 
Less - accumulated depreciation and amortization2,692,599 2,486,127 
Total property, plant and equipment, net$2,128,508 $1,980,302 
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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 $132.5 million and $106.7 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 $80.4 million and $229.7 million for the three and nine months ended September 30, 2023, respectively. Depreciation expense, inclusive of landfill and finance lease amortization, was $75.3 million and $223.0 million for the three and nine months ended September 30, 2022, 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. The Company recorded $0.9 million and $2.0 million of capitalized interest during the three and nine months ended September 30, 2022, respectively. The capitalized interest in all periods is mainly due to the construction of a new incinerator in Kimball, Nebraska.