PROPERTY, PLANT AND EQUIPMENT

9 Months Ended

Sep. 30, 2020

Property, Plant and Equipment [Abstract]

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


	September 30, 2020		December 31, 2019
Land	$	139,184	$	131,023
Asset retirement costs (non-landfill)	16,185		15,924
Landfill assets	185,678		182,276
Buildings and improvements (1)	502,507		499,159
Camp equipment	154,427		158,277
Vehicles (2)	819,583		785,056
Equipment (3)	1,798,792		1,779,366
Furniture and fixtures	6,920		6,054
Construction in progress	20,928		36,679
	3,644,204		3,593,814
Less - accumulated depreciation and amortization	2,104,871		2,005,663
Total property, plant and equipment, net	$	1,539,333	$	1,588,151

________________

(1) Balances inclusive of gross right-of-use ("ROU") assets classified as finance leases of $8.0 million and $31.0 million, respectively.

(2) Balances inclusive of gross ROU assets classified as finance leases of $43.8 million and $2.4 million, respectively.

(3) September 30, 2020 balance inclusive of gross ROU assets classified as finance leases of $9.1 million.

Depreciation expense, inclusive of landfill and finance lease amortization, was $64.9 million and $193.9 million for the three and nine months ended September 30, 2020, respectively. Depreciation expense, inclusive of landfill and finance lease amortization, was $65.3 million and $196.7 million for the three and nine months ended September 30, 2019, respectively.