PROPERTY, PLANT AND EQUIPMENT

3 Months Ended

Mar. 31, 2020

Property, Plant and Equipment [Abstract]

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



	March 31, 2020		December 31, 2019
Land	$	134,483	$	131,023
Asset retirement costs (non-landfill)	15,863		15,924
Landfill assets	179,217		182,276
Buildings and improvements ⁽¹⁾	491,415		499,159
Camp equipment	150,279		158,277
Vehicles ⁽²⁾	782,669		785,056
Equipment	1,743,261		1,779,366
Furniture and fixtures	6,804		6,054
Construction in progress	23,289		36,679
	3,527,280		3,593,814
Less - accumulated depreciation and amortization	1,980,161		2,005,663
Total property, plant and equipment, net	$	1,547,119	$	1,588,151

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(1) Balances inclusive of gross 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 $23.5 million and $2.4 million, respectively.

Depreciation expense, inclusive of landfill and finance lease amortization, was $65.4 million and $65.9 million for the three months ended March 31, 2020 and March 31, 2019, respectively.