PROPERTY, PLANT AND EQUIPMENT (Tables)

9 Months Ended

Sep. 30, 2021

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant and Equipment

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

	September 30, 2021		December 31, 2020
Land	$	150,257	$	139,776
Asset retirement costs (non-landfill)	17,921		16,407
Landfill assets	200,545		191,687
Buildings and improvements (1)	524,397		509,804
Camp equipment	132,477		159,021
Vehicles (2)	864,808		844,026
Equipment (3)	1,821,327		1,807,235
Furniture and fixtures	6,838		7,082
Construction in progress	63,522		24,378
	3,782,092		3,699,416
Less - accumulated depreciation and amortization	2,273,736		2,174,118
Total property, plant and equipment, net	$	1,508,356	$	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 $65.9 million and $47.2 million, respectively.

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