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FINAL CAPPING, CLOSURE AND POST-CLOSURE COSTS (Tables) | 12 Months Ended
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Dec. 31, 2016
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,
| 2016 |  | 2015
Beginning balance | $ | 41,041 |  |  | $ | 39,829 |
Obligations incurred | 2,441 |  |  | 1,798 |
Revisions in estimates (1) | (2,052 | ) |  | (2,030 | )
Accretion expense | 3,606 |  |  | 3,370 |
Obligations settled (2) | (829 | ) |  | (1,926 | )
Ending balance | $ | 44,207 |  |  | $ | 41,041 |
(1) | The revisions in estimates for final capping, closure and post-closure liabilities for fiscal year 2016 and fiscal year 2015 consist 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 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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