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ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE (Tables)
3 Months Ended
Mar. 31, 2020
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,
 20202019
Beginning balance$71,927  $73,075  
Obligations incurred898  543  
Accretion expense 1,622  1,607  
Obligations settled (1)
(1,097) (1,556) 
Ending balance$73,350  $73,669  
(1)Includes amounts that are being processed through accounts payable as a part of our disbursements cycle.