PROPERTY, PLANT, AND EQUIPMENT

12 Months Ended

Dec. 31, 2014

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT AND EQUIPMENT

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



	December 31, 2014		December 31, 2013
Land	$	98,507	$	99,794
Asset retirement costs (non-landfill)	10,871		10,938
Landfill assets	110,984		100,983
Buildings and improvements	338,242		327,956
Camp equipment	180,575		187,831
Vehicles	471,615		425,296
Equipment	1,302,424		1,201,296
Furniture and fixtures	5,517		5,260
Construction in progress	45,605		58,010
	2,564,340		2,417,364
Less - accumulated depreciation and amortization	1,005,506		815,194
Total property, plant and equipment, net	$	1,558,834	$	1,602,170

Interest in the amount of $0.5 million, $0.9 million and $0.2 million was capitalized to fixed assets during the years ended December 31, 2014, 2013 and 2012, respectively. Depreciation expense, inclusive of landfill amortization was $239.4 million, $229.4 million and $144.4 million for the years ended December 31, 2014, 2013 and 2012, respectively.

- Definition

The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures.

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