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COMMITMENTS AND CONTINGENCIES (Tables)
 9 Months Ended
Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]  
Summary of Environmental Liability Associated with Potsdam
A summary of the changes to the environmental remediation liability associated with the Potsdam environmental remediation liability follows:
 
Nine Months Ended
September 30,
 
2018
 
2017
Beginning balance
$
5,758

 
$
5,866

Obligations settled (1)
(98
)
 
(21
)
Ending balance
$
5,660

 
$
5,845


(1)
Includes amounts that are being processed through accounts payable as a part of our disbursements cycle.
The changes to the environmental remediation liability associated with the Southbridge Landfill are as follows:
 
Nine Months Ended
September 30,
 
2018
 
2017
Beginning balance
$
5,936

 
$
—

Accretion expense
116

 
41

Obligations incurred
—

 
6,379

Obligations settled (1)
(612
)
 
(241
)
Ending balance
$
5,440

 
$
6,179

(1)
Includes amounts that are being processed through accounts payable as a part of our disbursements cycle.