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FINAL CAPPING, CLOSURE AND POST-CLOSURE COSTS (Tables)
12 Months Ended
Dec. 31, 2020
Asset Retirement Obligation Disclosure [Abstract]  
Changes to Accrued Capping, Closure and Post-Closure Liabilities
The changes to accrued final capping, closure and post-closure liabilities are as follows:
Fiscal Year Ended December 31,
20202019
Beginning balance$71,927 $73,075 
Obligations incurred3,840 2,549 
Revisions in estimates (1)
4,531 (1,538)
Accretion expense6,436 6,227 
Obligations settled (2)
(4,201)(8,386)
Ending balance$82,533 $71,927 
(1)Relates to changes in estimates and assumptions concerning anticipated waste flow, cost and timing of future final capping, closure and post-closure activities at our landfills.
(2)May include amounts paid and amounts that are being processed through accounts payable as a part of our disbursement cycle.