CLOSURE AND POST-CLOSURE LIABILITIES (Tables)

3 Months Ended

Mar. 31, 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 March 31, 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	—			604			604
New asset retirement obligations	1,053			—			1,053
Accretion	646			619			1,265
Changes in estimates recorded to statement of operations	—			30			30
Changes in estimates recorded to balance sheet	441			—			441
Expenditures	(155		)	(62		)	(217		)
Currency translation and other	(78		)	(55		)	(133		)
Balance at March 31, 2018	$	34,289		$	29,791		$	64,080