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ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE (Tables)
3 Months Ended
Mar. 31, 2021
Asset Retirement Obligation Disclosure [Abstract]  
Summary of Changes to Accrued Capping, Closure and Post-Closure Liabilities
A summary of the changes to accrued final capping, closure and post-closure liabilities follows:
 Three Months Ended
March 31,
 20212020
Beginning balance$82,533 $71,927 
Obligations incurred1,038 898 
Accretion expense 1,811 1,622 
Obligations settled (1)
(357)(1,097)
Ending balance$85,025 $73,350 
(1)May include amounts that are being processed through accounts payable as a part of our disbursements cycle.