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COMMITMENTS AND CONTINGENCIES (Tables) | 3 Months Ended
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Mar. 31, 2020
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:
| Three Months Ended March 31, |  |
| 2020 |  | 2019
Beginning balance | $ | 4,596 |  |  | $ | 5,173 |
Accretion expense | 30 |  |  | 34 |
Obligations incurred | 27 |  |  | — |
Obligations settled (1) | (12) |  |  | (141) |
Ending balance | $ | 4,641 |  |  | $ | 5,066 |
(1)Includes amounts that are being processed through accounts payable as a part of our disbursements cycle.

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