CLOSURE AND POST-CLOSURE LIABILITIES (Tables)

9 Months Ended

Sep. 30, 2017

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, 2017 through September 30, 2017 were as follows (in thousands):

	Landfill Retirement Liability			Non-Landfill Retirement Liability			Total
Balance at January 1, 2017	$	30,630		$	27,701		$	58,331
Liabilities assumed in acquisitions	—			27			27
Measurement period adjustments from prior period acquisitions	—			596			596
New asset retirement obligations	1,376			—			1,376
Adjustment related to disposition of business	—			(1,170		)	(1,170		)
Accretion	1,658			1,882			3,540
Changes in estimates recorded to statement of operations	(131		)	(126		)	(257		)
Changes in estimates recorded to balance sheet	—			(284		)	(284		)
Expenditures	(2,269		)	(352		)	(2,621		)
Currency translation and other	182			119			301
Balance at September 30, 2017	$	31,446		$	28,393		$	59,839