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COMMITMENTS AND CONTINGENCIES (Tables)
 12 Months Ended
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Environmental Remedial Liability
A summary of the changes to the environmental remediation liability associated with the Southbridge Landfill follows:
 Fiscal Year Ended December 31,
 20202019
Beginning balance$4,596 $5,173 
Accretion expense118 124 
Obligations incurred28 — 
Revisions in estimates (1)
(188)— 
Obligations settled (2)
(293)(701)
Ending balance$4,261 $4,596 
(1)The revision of estimate is associated with the completion of the environmental remediation at the site. See Note 18, Other Items and Charges to our consolidated financial statements for further discussion.
(2)May include 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 site follows:
Fiscal Year Ended December 31,
20202019
Beginning balance$1,151 $5,614 
Obligations settled (1)
(212)(4,463)
Ending balance$939 $1,151 
(1)May include amounts that are being processed through accounts payable as a part of our disbursements cycle.
Schedule of Total Expected Environmental Remediation Payments for Succeeding Year
The total expected environmental remediation payments, in today’s dollars, for each of the five succeeding fiscal years and the aggregate amount thereafter are as follows:

Estimated Future Environmental Remediation Payments as of December 31, 2020
Fiscal year ending December 31, 2021$377 
Fiscal year ending December 31, 2022319 
Fiscal year ending December 31, 2023335 
Fiscal year ending December 31, 2024320 
Fiscal year ending December 31, 2025345 
Thereafter4,667 
Total$6,363 
Reconciliation of Expected Aggregate Non-inflated, Undiscounted Environmental Remediation Liability to Amount Recognized in Statement of Financial Position
A reconciliation of the expected aggregate non-inflated, undiscounted environmental remediation liability to the amount recognized in the statement of financial position is as follows:
Undiscounted liability$6,363 
Less discount, net(1,163)
Liability balance - December 31, 2020$5,200