PROPERTY, PLANT, AND EQUIPMENT

12 Months Ended

Dec. 31, 2023

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT, AND EQUIPMENT

PROPERTY, PLANT AND EQUIPMENT

Property, plant and equipment consisted of the following (in thousands):

	December 31, 2023		December 31, 2022
Land	$	174,891	$	172,579
Asset retirement costs (non-landfill)	27,167		22,001
Landfill assets	253,180		232,872
Buildings and improvements (1)	630,525		591,397
Vehicles (2)	1,276,567		1,112,188
Equipment (3)	2,388,370		2,195,064
Construction in progress	213,601		140,328
	4,964,301		4,466,429
Less - accumulated depreciation and amortization	2,770,983		2,486,127
Total property, plant and equipment, net	$	2,193,318	$	1,980,302

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(1) Balances inclusive of gross ROU assets classified as finance leases of $8.0 million.

(2) Balances inclusive of gross ROU assets classified as finance leases of $151.7 million and $106.7 million, respectively.

(3) Balances inclusive of gross ROU assets classified as finance leases of $9.2 million.

Depreciation expense, inclusive of landfill and finance lease amortization was $315.5 million, $297.4 million and $263.4 million for the years ended December 31, 2023, 2022 and 2021, respectively. The Company recorded $6.6 million and $3.4

million capitalized interest in 2023 and 2022, respectively, mainly due to the construction of a new incinerator in Kimball, Nebraska. Capitalized interest in 2021 was negligible.