PROPERTY, PLANT AND EQUIPMENT (Tables)

6 Months Ended

Jun. 30, 2020

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant and Equipment

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

	June 30, 2020		December 31, 2019
Land	$	139,859	$	131,023
Asset retirement costs (non-landfill)	16,102		15,924
Landfill assets	182,287		182,276
Buildings and improvements (1)	499,701		499,159
Camp equipment	153,980		158,277
Vehicles (2)	809,790		785,056
Equipment (3)	1,776,574		1,779,366
Furniture and fixtures	6,860		6,054
Construction in progress	21,040		36,679
	3,606,193		3,593,814
Less - accumulated depreciation and amortization	2,052,385		2,005,663
Total property, plant and equipment, net	$	1,553,808	$	1,588,151

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(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 $37.6 million and $2.4 million, respectively.

(3) June 30, 2020 balance inclusive of gross ROU assets classified as finance leases of $3.3 million.