ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE (Tables)

9 Months Ended

Sep. 30, 2020

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,
	2020		2019
Beginning balance	$	71,927	$	73,075
Obligations incurred	2,820		1,901
Revision in estimates (1)	152		—
Accretion expense	4,826		4,742
Obligations settled (2)	(2,706)		(7,099)
Ending balance	$	77,019	$	72,619

(1)Relates to changes in estimated costs and timing of final capping, closure and post-closure activities at the Town of Southbridge, Massachusetts landfill ("Southbridge Landfill"). See Note 10, Commitments and Contingencies and Note 13, Other Items and Charges for further discussion.

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