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FINAL CAPPING, CLOSURE AND POST-CLOSURE COSTS (Tables) | 12 Months Ended
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Dec. 31, 2020
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,
| 2020 |  | 2019
Beginning balance | $ | 71,927 |  |  | $ | 73,075 |
Obligations incurred | 3,840 |  |  | 2,549 |
Revisions in estimates (1) | 4,531 |  |  | (1,538) |
Accretion expense | 6,436 |  |  | 6,227 |
Obligations settled (2) | (4,201) |  |  | (8,386) |
Ending balance | $ | 82,533 |  |  | $ | 71,927 |
(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 our landfills. (2)May include 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://fasb.org/us-gaap/role/ref/legacyRef -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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