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COMMITMENTS AND CONTINGENCIES (Tables) | 6 Months Ended
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Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract] |
Summary of Environmental Liability | A summary of the changes to the environmental remediation liability associated with the Southbridge Landfill follows:
| Six Months Ended June 30,
| 2021 |  | 2020
Beginning balance | $ | 4,261 |  |  | $ | 4,596 |
Accretion expense | 56 |  |  | 62 |
Obligations incurred | — |  |  | 28 |
Revision in estimates (1) | — |  |  | (188) |
Obligations settled (2) | (281) |  |  | (293) |
Ending balance | $ | 4,036 |  |  | $ | 4,205 |
(1)The revision in estimates is associated with the completion of the environmental remediation at the site. See Note 11, 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.

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