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ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE (Tables)
6 Months Ended
Jun. 30, 2021
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:
 Six Months Ended
June 30,
 20212020
Beginning balance$82,533 $71,927 
Obligations incurred2,319 1,764 
Revision in estimates (1)
— 152 
Accretion expense 3,676 3,204 
Obligations settled (2)
(2,969)(1,650)
Ending balance$85,559 $75,397 
(1)Relates to changes in estimated costs and timing of final capping, closure and post-closure activities at the Town of Southbridge, Massachusetts landfill. See Note 8, Commitments and Contingencies and Note 11, Other Items and Charges for further discussion.
(2)May include amounts that are being processed through accounts payable as a part of our disbursements cycle.