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Accrued Final Capping, Closure and Post Closure (Tables) | 9 Months Ended
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Sep. 30, 2015
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 for the nine months ended September 30, 2015 and 2014 are as follows:
|  | Nine Months Ended September 30, |
|  | 2015 |  |  | 2014 |
Beginning balance |  | $ | 39,829 |  |  | $ | 46,326 |
Obligations incurred |  |  | 1,971 |  |  |  | 2,496 |
Revisions in estimates (1) |  |  | — |  |  |  | (3,728 | )
Accretion expense |  |  | 2,513 |  |  |  | 2,671 |
Obligations settled (2) |  |  | (2,209 | ) |  |  | (3,822 | )
Ending balance |  | $ | 42,104 |  |  | $ | 43,943 |
(1) | The revisions in estimates for final capping, closure and post-closure costs consisted of changes in cost estimates and the timing of final capping and closure events, as well as changes to expansion airspace and tonnage placement assumptions as a result of our review of landfill asset retirement obligations.
(2) | Obligations settled include 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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