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COMMITMENTS AND CONTINGENCIES (Tables)
 6 Months Ended
Jun. 30, 2022
Commitments and Contingencies Disclosure [Abstract]  
Summary of Environmental Liability A summary of the changes to the aggregate environmental remediation liabilities for the six months ended June 30, 2022 and 2021 follows:
Six Months Ended
June 30,
20222021
Beginning balance$5,887 $5,200 
Accretion expense54 56 
Obligations settled (1)(72)(281)
Ending balance5,869 4,975 
Less: current portion280 375 
Long-term portion$5,589 $4,600 
(1)May include amounts paid and amounts that are being processed through accounts payable as a part of our disbursement cycle.