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ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE (Tables)
 9 Months Ended
Sep. 30, 2016
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,
 
2016
 
2015
Beginning balance
$
41,041

 
$
39,829

Obligations incurred
1,828

 
1,971

Revisions in estimates (1)
(56
)
 
—

Accretion expense
2,688

 
2,513

Obligations settled (2)
(601
)
 
(2,209
)
Ending balance
$
44,900

 
$
42,104

 
(1)
Relates to changes in estimates and assumptions concerning the anticipated waste flow, cost and timing of future final capping, closure and post-closure activities at certain of our landfills.
(2)
Includes amounts that are being processed through accounts payable as a part of our disbursement cycle.