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Accrued Final Capping, Closure and Post Closure (Tables) | 6 Months Ended
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Jun. 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:
|  | Six Months Ended June 30, |
|  | 2016 |  |  | 2015 |
Beginning balance |  | $ | 41,041 |  |  | $ | 39,829 |
Obligations incurred |  |  | 1,143 |  |  |  | 1,116 |
Revisions in estimates (1) |  |  | (56 | ) |  |  | — |
Accretion expense |  |  | 1,782 |  |  |  | 1,665 |
Obligations settled (2) |  |  | (432 | ) |  |  | (984 | )
Ending balance |  | $ | 43,478 |  |  | $ | 41,626 |
(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 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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