PROPERTY, PLANT, AND EQUIPMENT

12 Months Ended

Dec. 31, 2015

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, 2015		December 31, 2014
Land	$	100,582	$	98,507
Asset retirement costs (non-landfill)	12,434		10,871
Landfill assets	136,624		110,984
Buildings and improvements	344,209		338,242
Camp equipment	149,361		180,575
Vehicles	500,619		471,615
Equipment	1,328,915		1,302,424
Furniture and fixtures	5,337		5,517
Construction in progress	113,657		45,605
	2,691,738		2,564,340
Less - accumulated depreciation and amortization	1,159,271		1,005,506
Total property, plant and equipment, net	$	1,532,467	$	1,558,834

Interest in the amount of $2.0 million, $0.5 million and $0.9 million was capitalized to fixed assets during the years ended December 31, 2015, 2014 and 2013, respectively. Depreciation expense, inclusive of landfill amortization was$234.0 million, $239.4 million and $229.4 million for the years ended December 31, 2015, 2014 and 2013, respectively.