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COMMITMENTS AND CONTINGENCIES (Tables)
 6 Months Ended
Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]  
Summary of Environmental Liability Associated with Potsdam
The changes to the environmental remediation liability associated with the Potsdam site are as follows:
 
 
 
 
 
Six Months Ended June 30,
 
2017
 
2016
Beginning balance
$
5,866

 
$
5,221

Obligations settled (1)
(5
)
 
—

Ending balance
$
5,861

 
$
5,221

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