PROPERTY, PLANT, AND EQUIPMENT

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT, AND EQUIPMENT

PROPERTY, PLANT AND EQUIPMENT

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

	December 31, 2019		December 31, 2018
Land	$	131,023	$	123,734
Asset retirement costs (non-landfill)	15,924		15,148
Landfill assets	182,276		154,918
Buildings and improvements (1)	499,159		440,188
Camp and lodging equipment	158,277		152,998
Vehicles (1)	785,056		721,735
Equipment	1,779,366		1,697,490
Furniture and fixtures	6,054		5,453
Construction in progress	36,679		20,931
	3,593,814		3,332,595
Less - accumulated depreciation and amortization	2,005,663		1,770,617
Total property, plant and equipment, net	$	1,588,151	$	1,561,978

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(1) December 31, 2019 balances inclusive of ROU assets classified as finance leases.

Depreciation expense, inclusive of landfill and finance lease amortization was $265.5 million, $264.3 million and $251.4 million for the years ended December 31, 2019, 2018 and 2017, respectively.