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FINAL CAPPING, CLOSURE AND POST-CLOSURE COSTS (Tables) | 12 Months Ended
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Dec. 31, 2017
Asset Retirement Obligation Disclosure [Abstract] |
Changes to Accrued Capping, Closure and Post-Closure Liabilities | The changes to accrued final capping, closure and post-closure liabilities are as follows:
| Fiscal Year Ended December 31,
| 2017 |  | 2016
Beginning balance | $ | 44,207 |  |  | $ | 41,041 |
Obligations incurred | 3,022 |  |  | 2,441 |
Revisions in estimates (1) | 11,498 |  |  | (2,052 | )
Accretion expense | 4,401 |  |  | 3,606 |
Obligations settled (2) | (838 | ) |  | (829 | )
Ending balance | $ | 62,290 |  |  | $ | 44,207 |
(1) | Relates to changes in estimates and assumptions concerning anticipated waste flow, cost and timing of future final capping, closure and post-closure activities at certain landfills, including the Subtitle D landfill in Southbridge, Massachusetts ("Southbridge Landfill"), as well as changes to expansion airspace. See Note 10, Commitments and Contingencies and Note 15, Other Items and Charges for disclosure regarding Southbridge Landfill.
(2) | Includes amounts paid and amounts that are being processed through accounts payable as a part of our disbursement 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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