CLOSURE AND POST-CLOSURE LIABILITIES (Tables)

6 Months Ended

Jun. 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 June 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	—			604			604
New asset retirement obligations	1,478			—			1,478
Accretion	1,284			1,245			2,529
Changes in estimates recorded to statement of operations	—			85			85
Changes in estimates recorded to balance sheet	430			—			430
Expenditures	(359		)	(88		)	(447		)
Currency translation and other	(127		)	(85		)	(212		)
Balance at June 30, 2018	$	35,088		$	30,416		$	65,504