XML 23 R13.htm IDEA: XBRL DOCUMENT v3.22.1
ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE
 3 Months Ended
Mar. 31, 2022
Asset Retirement Obligation Disclosure [Abstract]  
ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSUREAccrued 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,
 20222021
Beginning balance$86,914 $82,533 
Obligations incurred966 1,038 
Accretion expense 1,873 1,811 
Obligations settled (1)
(926)(357)
Ending balance$88,827 $85,025 
(1)May include amounts that are being processed through accounts payable as a part of our disbursements cycle.