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ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE (Tables)
 6 Months Ended
Jun. 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:
 
Six Months Ended
June 30,
 
2017
 
2016
Beginning balance
$
44,207

 
$
41,041

Obligations incurred
1,310

 
1,143

Revisions in estimates (1)
9,598

 
(56
)
Accretion expense
1,939

 
1,782

Obligations settled (2)
(307
)
 
(432
)
Ending balance
$
56,747

 
$
43,478

 
(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 our Southbridge landfill associated with the Southbridge landfill closure. See Note 8, Commitments and Contingencies and Note 11, Other Items and Charges for disclosure regarding the matter.
(2)
Includes amounts that are being processed through accounts payable as a part of our disbursement cycle.