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ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE (Tables) | 3 Months Ended
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Mar. 31, 2021
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:
| Three Months Ended March 31,
| 2021 |  | 2020
Beginning balance | $ | 82,533 |  |  | $ | 71,927 |
Obligations incurred | 1,038 |  |  | 898 |
Accretion expense | 1,811 |  |  | 1,622 |
Obligations settled (1) | (357) |  |  | (1,097) |
Ending balance | $ | 85,025 |  |  | $ | 73,350 |
(1)May include amounts that are being processed through accounts payable as a part of our disbursements 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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