CLOSURE AND POST-CLOSURE LIABILITIES (Tables)

6 Months Ended

Jun. 30, 2015

Asset Retirement Obligation Disclosure [Abstract]

Schedule of closure and post-closure liabilities

The changes to closure and post-closure liabilities (also referred to as “asset retirement obligations”) for the six months ended June 30, 2015 were as follows (in thousands):

	Landfill Retirement Liability			Non-Landfill Retirement Liability			Total
Balance at January 1, 2015	$	29,932		$	20,769		$	50,701
Liabilities assumed in acquisitions	—			1,676			1,676
New asset retirement obligations	1,327			—			1,327
Accretion	1,305			1,021			2,326
Changes in estimates recorded to statement of income	60			25			85
Changes in estimates recorded to balance sheet	(932		)	—			(932		)
Expenditures	(2,980		)	(86		)	(3,066		)
Currency translation and other	(166		)	(105		)	(271		)
Balance at June 30, 2015	$	28,546		$	23,300		$	51,846