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PROPERTY, PLANT AND EQUIPMENT
 6 Months Ended
Jun. 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):
June 30, 2023December 31, 2022
Land$174,235 $172,579 
Asset retirement costs (non-landfill)27,164 22,001 
Landfill assets244,639 232,872 
Buildings and improvements (1)
617,189 591,397 
Vehicles (2)
1,174,004 1,112,188 
Equipment (3)
2,307,666 2,195,064 
Construction in progress170,120 140,328 
4,715,017 4,466,429 
Less - accumulated depreciation and amortization2,632,324 2,486,127 
Total property, plant and equipment, net$2,082,693 $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 $120.8 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 $77.2 million and $149.2 million for the three and six months ended June 30, 2023, respectively. Depreciation expense, inclusive of landfill and finance lease amortization, was $75.6 million and $147.7 million for the three and six months ended June 30, 2022, 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. The Company recorded $0.7 million and $1.1 million of capitalized interest during the three and six months ended June 30, 2022, respectively. The capitalized interest in the periods is mainly due to the construction of a new incinerator in Kimball, Nebraska.