PROPERTY, PLANT AND EQUIPMENT

6 Months Ended

Jun. 30, 2021

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, 2021		December 31, 2020
Land	$	148,749	$	139,776
Asset retirement costs (non-landfill)	17,851		16,407
Landfill assets	196,156		191,687
Buildings and improvements (1)	523,136		509,804
Camp equipment	157,554		159,021
Vehicles (2)	867,498		844,026
Equipment (3)	1,821,298		1,807,235
Furniture and fixtures	7,195		7,082
Construction in progress	44,555		24,378
	3,783,992		3,699,416
Less - accumulated depreciation and amortization	2,252,703		2,174,118
Total property, plant and equipment, net	$	1,531,289	$	1,525,298

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(1) Balances inclusive of gross right-of-use ("ROU") assets classified as finance leases of $8.9 million in both periods.

(2) Balances inclusive of gross ROU assets classified as finance leases of $66.0 million and $47.2 million, respectively.

(3) Balances inclusive of gross ROU assets classified as finance leases of $9.3 million in both periods.

Depreciation expense, inclusive of landfill and finance lease amortization, was $63.8 million and $128.4 million for the three and six months ended June 30, 2021, respectively. Depreciation expense, inclusive of landfill and finance lease amortization, was $63.7 million and $129.0 million for the three and six months ended June 30, 2020, respectively.