CLOSURE AND POST-CLOSURE LIABILITIES (Tables)

9 Months Ended

Sep. 30, 2018

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”) from January 1, 2018 through September 30, 2018 were as follows (in thousands):

	Landfill Retirement Liability			Non-Landfill Retirement Liability			Total
Balance at January 1, 2018	$	32,382		$	28,655		$	61,037
Liabilities assumed in acquisition	—			354			354
New asset retirement obligations	2,052			—			2,052
Accretion	1,898			1,897			3,795
Changes in estimates recorded to statement of operations	—			400			400
Changes in estimates recorded to balance sheet	871			64			935
Expenditures	(787		)	(269		)	(1,056		)
Currency translation and other	(79		)	(57		)	(136		)
Balance at September 30, 2018	$	36,337		$	31,044		$	67,381