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ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE (Tables)
 9 Months Ended
Sep. 30, 2017
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:
 
Nine Months Ended
September 30,
 
2017
 
2016
Beginning balance
$
44,207

 
$
41,041

Obligations incurred
2,187

 
1,828

Revisions in estimates (1)
9,598

 
(56
)
Accretion expense
3,164

 
2,688

Obligations settled (2)
(586
)
 
(601
)
Ending balance
$
58,570

 
$
44,900

 
(1)
Relates to changes in estimates and assumptions concerning anticipated waste flow, cost and timing of future final capping, closure and post-closure activities at certain landfills, including the Town of Southbridge, Massachusetts ("Town") Landfill ("Southbridge Landfill"). See Note 7, Commitments and Contingencies and Note 10, Other Items and Charges for disclosure regarding the matter.
(2)
Includes amounts that are being processed through accounts payable as a part of our disbursements cycle.