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COMMITMENTS AND CONTINGENCIES (Tables)
 6 Months Ended
Jun. 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:
 
Six Months Ended
June 30,
 
2018
 
2017
Beginning balance
$
5,758

 
$
5,866

Obligations settled (1)
(11
)
 
(5
)
Ending balance
$
5,747

 
$
5,861


(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:
 
Six Months Ended
June 30,
 
2018
 
2017
Beginning balance
$
5,936

 
$
—

Accretion expense
78

 
—

Obligations incurred
—

 
6,379

Obligations settled (1)
(441
)
 
—

Ending balance
$
5,573

 
$
6,379

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