PROPERTY, PLANT AND EQUIPMENT

6 Months Ended

Jun. 30, 2016

Property, Plant and Equipment [Abstract]

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



	June 30, 2016		December 31, 2015
Land	$	104,533	$	100,582
Asset retirement costs (non-landfill)	12,187		12,434
Landfill assets	144,540		136,624
Buildings and improvements	354,470		344,209
Camp equipment	158,394		149,361
Vehicles	538,170		500,619
Equipment	1,414,946		1,328,915
Furniture and fixtures	5,528		5,337
Construction in progress	146,199		113,657
	2,878,967		2,691,738
Less - accumulated depreciation and amortization	1,283,980		1,159,271
Total property, plant and equipment, net	$	1,594,987	$	1,532,467

Interest in the amount of $1.3 million and $2.5 million was capitalized to fixed assets during the three and six months ended June 30, 2016, respectively. Interest in the amount of $0.4 million and $0.6 million was capitalized to fixed assets during the three and six months ended June 30, 2015, respectively. Depreciation expense, inclusive of landfill amortization was $63.5 million and $122.8 million for the three and six months ended June 30, 2016, respectively. Depreciation expense, inclusive of landfill amortization was $58.9 million and $116.3 million for the three and six months ended June 30, 2015, respectively.