PROPERTY, PLANT AND EQUIPMENT (Tables)

3 Months Ended

Mar. 31, 2021

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant and Equipment

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

	March 31, 2021		December 31, 2020
Land	$	145,662	$	139,776
Asset retirement costs (non-landfill)	17,747		16,407
Landfill assets	193,009		191,687
Buildings and improvements (1)	514,711		509,804
Camp equipment	158,281		159,021
Vehicles (2)	855,842		844,026
Equipment (3)	1,812,858		1,807,235
Furniture and fixtures	6,992		7,082
Construction in progress	39,943		24,378
	3,745,045		3,699,416
Less - accumulated depreciation and amortization	2,217,101		2,174,118
Total property, plant and equipment, net	$	1,527,944	$	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 $56.4 million and $47.2 million, respectively.

(3) Balances inclusive of gross ROU assets classified as finance leases of $9.4 million and $9.3 million, respectively.