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COMMITMENTS AND CONTINGENCIES (Tables)
 3 Months Ended
Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]  
Summary of Environmental Liability Associated with Potsdam
The changes to the environmental remediation liability associated with the Southbridge Landfill are as follows:
 
Three Months Ended
March 31,
 
2019
 
2018
Beginning balance
$
5,173

 
$
5,936

Accretion expense
34

 
39

Obligations settled (1)
(141
)
 
(237
)
Ending balance
$
5,066

 
$
5,738

(1)
Includes amounts that are being processed through accounts payable as a part of our disbursements cycle.
A summary of the changes to the environmental remediation liability associated with the Potsdam environmental remediation liability follows:
 
Three Months Ended
March 31,
 
2019
 
2018
Beginning balance
$
5,614

 
$
5,758

Obligations settled
—

 
(6
)
Ending balance
$
5,614

 
$
5,752