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ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE (Tables) | 3 Months Ended
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Mar. 31, 2019
Asset Retirement Obligation Disclosure [Abstract] |
Summary of Changes to Accrued Capping, Closure and Post-Closure Liabilities | A summary of the changes to accrued final capping, closure and post-closure liabilities follows:
| Three Months Ended March 31,
| 2019 |  | 2018
Beginning balance | $ | 73,075 |  |  | $ | 62,290 |
Obligations incurred | 543 |  |  | 798 |
Revision in estimates (1) | — |  |  | 1,492 |
Accretion expense | 1,607 |  |  | 1,383 |
Obligations settled (2) | (1,556 | ) |  | (297 | )
Ending balance | $ | 73,669 |  |  | $ | 65,666 |
(1) | Relates to changes in estimates and assumptions associated with anticipated costs of future final capping, closure and post-closure activities at the Town of Southbridge, Massachusetts landfill. See Note 8, Commitments and Contingencies and Note 11, Other Items and Charges for additional disclosure regarding the matter.
(2) | Includes amounts that are being processed through accounts payable as a part of our disbursements cycle.

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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