ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE (Tables)

9 Months Ended

Sep. 30, 2019

Asset Retirement Obligation Disclosure [Abstract]

Summary of Changes to Accrued Capping, Closure and Post-Closure Liabilities

A summary of the changes to accrued final capping, closure and post-closure liabilities follows:

	Nine Months Ended September 30,
	2019		2018
Beginning balance	$	73,075	$	62,290
Obligations incurred	1,901		2,874
Revision in estimates (1)	—		1,492
Accretion expense	4,742		4,175
Obligations settled (2)	(7,099)		(2,310)
Ending balance	$	72,619	$	68,521

(1)Relates to changes in estimates and assumptions associated with anticipated costs of future final capping, closure and post-closure activities at the Town of Southbridge, Massachusetts landfill. See Note 9, Commitments and Contingencies and Note 12, Other Items and Charges for additional disclosure regarding the matter.

(2)Includes amounts that are being processed through accounts payable as a part of our disbursements cycle.