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COMMITMENTS AND CONTINGENCIES (Tables)
6 Months Ended
Jun. 30, 2021
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:
 Six Months Ended
June 30,
 20212020
Beginning balance$4,261 $4,596 
Accretion expense56 62 
Obligations incurred— 28 
Revision in estimates (1)
— (188)
Obligations settled (2)
(281)(293)
Ending balance$4,036 $4,205 
(1)The revision in estimates is associated with the completion of the environmental remediation at the site. See Note 11, Other Items and Charges to our consolidated financial statements for further discussion.
(2)May include amounts that are being processed through accounts payable as a part of our disbursements cycle.