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ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE
 3 Months Ended
Mar. 31, 2023
Asset Retirement Obligation Disclosure [Abstract]  
ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE
Accrued 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. 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.
A summary of the changes to accrued final capping, closure and post-closure liabilities follows:
 Three Months Ended
March 31,
 20232022
Beginning balance$113,678 $86,914 
Obligations incurred1,247 966 
Accretion expense 2,410 1,873 
Obligations settled (1)
(1,179)(926)
Ending balance$116,156 $88,827 

(1)May include amounts that are being processed through accounts payable as a part of our disbursements cycle.