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COMMITMENTS AND CONTINGENCIES (Tables) | 12 Months Ended
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Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract] |
Schedule of Environmental Remedial Liability | A summary of the changes to the environmental remediation liability associated with the NCES Landfill follows:
| Fiscal Year Ended December 31, 2021
Beginning balance | $ | — |
Accretion expense | — |
Obligations incurred | 924 |
Ending balance | $ | 924 |
A summary of the changes to the environmental remediation liability associated with the Southbridge Landfill follows:
| Fiscal Year Ended December 31,
| 2021 |  | 2020
Beginning balance | $ | 4,261 |  |  | $ | 4,596 |
Accretion expense | 109 |  |  | 118 |
Obligations incurred | — |  |  | 28 |
Revisions in estimates (1) | — |  |  | (188) |
Obligations settled (2) | (281) |  |  | (293) |
Ending balance | $ | 4,089 |  |  | $ | 4,261 |
(1)The revisions in estimates are associated with the completion of the environmental remediation at the site. See Note 17, 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,
| 2021 |  | 2020
Beginning balance | $ | 939 |  |  | $ | 1,151 |
Obligations settled (1) | (65) |  |  | (212) |
Ending balance | $ | 874 |  |  | $ | 939 |
(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, 2021
Fiscal year ending December 31, 2022 | $ | 354 |
Fiscal year ending December 31, 2023 | 667 |
Fiscal year ending December 31, 2024 | 769 |
Fiscal year ending December 31, 2025 | 308 |
Fiscal year ending December 31, 2026 | 318 |
Thereafter | 4,308 |
Total | $ | 6,724 |
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 our consolidated balance sheet at December 31, 2021 is as follows:
Undiscounted liability | $ | 6,724 |
Less discount, net | (837) |
Liability balance - December 31, 2021 | $ | 5,887 |

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