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ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE (Tables) | 6 Months Ended
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Jun. 30, 2021
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:
| Six Months Ended June 30,
| 2021 |  | 2020
Beginning balance | $ | 82,533 |  |  | $ | 71,927 |
Obligations incurred | 2,319 |  |  | 1,764 |
Revision in estimates (1) | — |  |  | 152 |
Accretion expense | 3,676 |  |  | 3,204 |
Obligations settled (2) | (2,969) |  |  | (1,650) |
Ending balance | $ | 85,559 |  |  | $ | 75,397 |
(1)Relates to changes in estimated costs and timing of 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 further discussion. (2)May include 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://fasb.org/us-gaap/role/ref/legacyRef -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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