CLOSURE AND POST-CLOSURE LIABILITIES (Tables)

6 Months Ended

Jun. 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 June 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
Measurement period adjustments from prior period acquisitions	—			596			596
New asset retirement obligations	894			—			894
Adjustment related to disposition of business	—			(1,170		)	(1,170		)
Accretion	1,094			1,270			2,364
Changes in estimates recorded to statement of operations	—			(262		)	(262		)
Changes in estimates recorded to balance sheet	—			(287		)	(287		)
Expenditures	(556		)	(254		)	(810		)
Currency translation and other	82			55			137
Balance at June 30, 2017	$	32,144		$	27,649		$	59,793