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COMMITMENTS AND CONTINGENCIES (Tables)
 6 Months Ended
Jun. 30, 2023
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, 2023 and 2022 follows:
Six Months Ended
June 30,
20232022
Beginning balance$6,335 $5,887 
Accretion expense51 54 
Obligations settled (1)
(320)(72)
Ending balance6,066 5,869 
Less: current portion1,430 280 
Long-term portion$4,636 $5,589 
(1)May include amounts paid and amounts that are being processed through accounts payable as a part of our disbursement cycle.