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COMMITMENTS AND CONTINGENCIES (Tables) | 6 Months Ended
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Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract] |
Summary of Environmental Liability Associated with Potsdam | The changes to the environmental remediation liability associated with the Southbridge Landfill are as follows:
| Six Months Ended June 30,
| 2019 |  | 2018
Beginning balance | $ | 5,173 |  |  | $ | 5,936 |
Accretion expense | 65 |  |  | 78 |
Obligations settled (1) | (392 | ) |  | (441 | )
Ending balance | $ | 4,846 |  |  | $ | 5,573 |
(1) Includes 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 environmental remediation liability follows:
| Six Months Ended June 30,
| 2019 |  | 2018
Beginning balance | $ | 5,614 |  |  | $ | 5,758 |
Obligations settled | (1,764 | ) |  | (11 | )
Ending balance | $ | 3,850 |  |  | $ | 5,747 |

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