PROPERTY, PLANT AND EQUIPMENT (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Components of Property, Plant and Equipment

We provide for depreciation and amortization using the straight-line method by charges to operations in amounts that allocate the cost of the assets over their estimated useful lives as follows:

Asset Classification	Estimated Useful Life
Buildings and improvements	10-30 years
Machinery and equipment	5-10 years
Rolling stock	5-10 years
Containers	5-12 years
Furniture and Fixtures	3-8 years

A summary of property, plant and equipment is as follows:

	December 31,
	2017			2016
Land	$	24,224		$	24,517
Landfills	513,548			570,464
Landfill operating lease contracts	114,462			133,239
Buildings and improvements	140,155			143,036
Machinery and equipment	139,029			132,748
Rolling stock	138,102			133,840
Containers	103,501			97,744
	1,173,021			1,235,588
Less: accumulated depreciation and amortization	(811,474		)	(837,122		)
	$	361,547		$	398,466