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Accrued Final Capping, Closure and Post Closure | 6 Months Ended
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Jun. 30, 2015
Asset Retirement Obligation Disclosure [Abstract] |
Accrued Final Capping, Closure and Post Closure | 4. ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE Accrued final capping, closure and post-closure costs include the current and non-current portion of costs associated with obligations for final capping, closure and post-closure of our landfills. We estimate our future final capping, closure and post-closure costs in order to determine the final capping, closure and post-closure expense per ton of waste placed into each landfill. The anticipated timeframe for paying these costs varies based on the remaining useful life of each landfill, as well as the duration of the post-closure monitoring period. The changes to accrued final capping, closure and post-closure liabilities for the six months ended June 30, 2015 and 2014 are as follows:
|  | Six Months Ended June 30, |
|  | 2015 |  |  | 2014 |
Beginning balance |  | $ | 39,829 |  |  | $ | 46,326 |
Obligations incurred |  |  | 1,116 |  |  |  | 1,640 |
Revisions in estimates (1) |  |  | — |  |  |  | (3,728 | )
Accretion expense |  |  | 1,665 |  |  |  | 1,876 |
Obligations settled (2) |  |  | (984 | ) |  |  | (705 | )
Ending balance |  | $ | 41,626 |  |  | $ | 45,409 |
(1) | The revisions in estimates for final capping, closure and post-closure 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.
(2) | Includes amounts that are being processed through accounts payable as a part of our disbursement cycle.

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7569-110849 + Details
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