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ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE (Tables) | 9 Months Ended
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Sep. 30, 2016
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:
| Nine Months Ended September 30,
| 2016 |  | 2015
Beginning balance | $ | 41,041 |  |  | $ | 39,829 |
Obligations incurred | 1,828 |  |  | 1,971 |
Revisions in estimates (1) | (56 | ) |  | — |
Accretion expense | 2,688 |  |  | 2,513 |
Obligations settled (2) | (601 | ) |  | (2,209 | )
Ending balance | $ | 44,900 |  |  | $ | 42,104 |
(1) | Relates to changes in estimates and assumptions concerning the anticipated waste flow, cost and timing of future final capping, closure and post-closure activities at certain of our landfills.
(2) | Includes 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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