PROPERTY, PLANT AND EQUIPMENT

3 Months Ended

Mar. 31, 2023

Property, Plant and Equipment [Abstract]

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


	March 31, 2023		December 31, 2022
Land	$	172,270	$	172,579
Asset retirement costs (non-landfill)	26,455		22,001
Landfill assets	237,526		232,872
Buildings and improvements (1)	612,530		591,397

Vehicles (2)	1,136,777		1,112,188
Equipment (3)	2,262,144		2,195,064

Construction in progress	135,756		140,328
	4,583,458		4,466,429
Less - accumulated depreciation and amortization	2,555,945		2,486,127
Total property, plant and equipment, net	$	2,027,513	$	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 $111.9 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 $72.0 million and $72.1 million for the three months ended March 31, 2023 and March 31, 2022, respectively. The Company recorded $1.2 million and $0.4 million of capitalized interest during the three months ended March 31, 2023 and March 31, 2022, respectively, mainly attributable to the construction of a new incinerator in Kimball, Nebraska.