CLOSURE AND POST-CLOSURE LIABILITIES (Tables)

3 Months Ended

Mar. 31, 2013

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 three months ended March 31, 2013 were as follows (in thousands):

	Landfill Retirement Liability			Non-Landfill Retirement Liability			Total
Balance at January 1, 2013	$	26,658		$	27,590		$	54,248
Adjustments during the measurement period related to acquisitions	—			(10,201		)	(10,201		)
New asset retirement obligations	860			—			860
Accretion	739			416			1,155
Changes in estimates recorded to statement of income	(16		)	58			42
Changes in estimates recorded to balance sheet	369			—			369
Expenditures	(934		)	(70		)	(1,004		)
Currency translation and other	(93		)	(23		)	(116		)
Balance at March 31, 2013	$	27,583		$	17,770		$	45,353