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ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE (Tables)
6 Months Ended
Jun. 30, 2019
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:
 
Six Months Ended
June 30,
 
2019
 
2018
Beginning balance
$
73,075

 
$
62,290

Obligations incurred
1,217

 
1,793

Revision in estimates (1)

 
1,492

Accretion expense
3,194

 
2,784

Obligations settled (2)
(2,947
)
 
(614
)
Ending balance
$
74,539

 
$
67,745

 
(1)
Relates to changes in estimates and assumptions associated with anticipated costs of future final capping, closure and post-closure activities at the Town of Southbridge, Massachusetts landfill. See Note 9, Commitments and Contingencies and Note 12, Other Items and Charges for additional disclosure regarding the matter.
(2)
Includes amounts that are being processed through accounts payable as a part of our disbursements cycle.