COMMITMENTS AND CONTINGENCIES (Tables)

3 Months Ended

Mar. 31, 2020

Commitments and Contingencies Disclosure [Abstract]

Summary of Environmental Liability

A summary of the changes to the environmental remediation liability associated with the Southbridge Landfill follows:

	Three Months Ended March 31,
	2020		2019
Beginning balance	$	4,596	$	5,173
Accretion expense	30		34
Obligations incurred	27		—
Obligations settled (1)	(12)		(141)
Ending balance	$	4,641	$	5,066

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