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ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE (Tables)
6 Months Ended
Jun. 30, 2022
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,
 20222021
Beginning balance$86,914 $82,533 
Obligations incurred2,244 2,319 
Revision in estimates (1)
1,443 — 
Accretion expense 3,799 3,676 
Obligations settled (2)
(2,027)(2,969)
Ending balance$92,373 $85,559 
(1)Relates to a change in estimates concerning anticipated capping costs at one of our landfills.
(2)May include amounts that are being processed through accounts payable as a part of our disbursements cycle.