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ACCRUED FINAL CAPPING, CLOSURE AND POST-CLOSURE COSTS
 6 Months Ended
Jun. 30, 2025
Asset Retirement Obligation Disclosure [Abstract]  
ACCRUED FINAL CAPPING, CLOSURE AND POST-CLOSURE COSTS ACCRUED FINAL CAPPING, CLOSURE AND POST-CLOSURE COSTS
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 of our landfills 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:
 Six Months Ended
June 30,
 20252024
Beginning balance$172,230 $133,904 
Obligations incurred3,834 3,354 
Accretion expense 7,316 5,733 
Obligations settled (1)
(1,917)(2,223)
Ending balance$181,463 $140,768 
(1)May include amounts that are being processed through accounts payable as a part of our disbursements cycle.