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COMMITMENTS AND CONTINGENCIES (Tables) | 9 Months Ended
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Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract] |
Summary of Environmental Liability Associated with Potsdam | A summary of the changes to the environmental remediation liability associated with the Potsdam environmental remediation liability follows:
| Nine Months Ended September 30,
| 2018 |  | 2017
Beginning balance | $ | 5,758 |  |  | $ | 5,866 |
Obligations settled (1) | (98 | ) |  | (21 | )
Ending balance | $ | 5,660 |  |  | $ | 5,845 |
(1) | Includes amounts that are being processed through accounts payable as a part of our disbursements cycle.
The changes to the environmental remediation liability associated with the Southbridge Landfill are as follows:
| Nine Months Ended September 30,
| 2018 |  | 2017
Beginning balance | $ | 5,936 |  |  | $ | — |
Accretion expense | 116 |  |  | 41 |
Obligations incurred | — |  |  | 6,379 |
Obligations settled (1) | (612 | ) |  | (241 | )
Ending balance | $ | 5,440 |  |  | $ | 6,179 |
(1) | Includes amounts that are being processed through accounts payable as a part of our disbursements cycle.

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- Definition Tabular disclosure of environmental loss contingencies by individual site. Does not include loss contingencies that are not environmental in nature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 10 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13283-110859 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859 + Details
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