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COMMITMENTS AND CONTINGENCIES (Tables)
6 Months Ended
Jun. 30, 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:
 Six Months Ended
June 30,
 20202019
Beginning balance$4,596  $5,173  
Accretion expense62  65  
Obligations incurred28  —  
Revisions in estimates (1)
(188) —  
Obligations settled (2)
(293) (392) 
Ending balance$4,205  $4,846  
(1)The revision of estimate is associated with the completion of the environmental remediation at the site. See Note 13, Other Items and Charges to our consolidated financial statements for further discussion.
(2)Includes amounts that are being processed through accounts payable as a part of our disbursements cycle.