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FINAL CAPPING, CLOSURE AND POST-CLOSURE COSTS
 12 Months Ended
Dec. 31, 2020
Asset Retirement Obligation Disclosure [Abstract]  
FINAL CAPPING, CLOSURE AND POST-CLOSURE COSTS FINAL CAPPING, CLOSURE AND POST-CLOSURE COSTSAccrued final capping, closure and post-closure costs include the current and non-current portion of costs associated with obligations for final capping closure and post-closure of our landfills. We estimate our future final capping, closure and post-closure costs in order to determine the final capping, closure and post-closure expense per ton of waste placed into each landfill as further described in Note 3, Summary of Significant Accounting Policies. The anticipated time frame for paying these costs varies based on the remaining useful life of each landfill, as well as the duration of the post-closure monitoring period.
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.