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COMMITMENTS AND CONTINGENCIES (Tables)
 6 Months Ended
Jun. 30, 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:
 
Six Months Ended
June 30,
 
2019
 
2018
Beginning balance
$
5,173

 
$
5,936

Accretion expense
65

 
78

Obligations settled (1)
(392
)
 
(441
)
Ending balance
$
4,846

 
$
5,573

(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:
 
Six Months Ended
June 30,
 
2019
 
2018
Beginning balance
$
5,614

 
$
5,758

Obligations settled
(1,764
)
 
(11
)
Ending balance
$
3,850

 
$
5,747