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CLOSURE AND POST-CLOSURE LIABILITIES (Tables) | 9 Months Ended
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Sep. 30, 2021
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of Closure and Post-Closure Liabilities | The changes to closure and post-closure liabilities (also referred to as “asset retirement obligations”) from January 1, 2021 through September 30, 2021 were as follows (in thousands):
| Landfill Retirement Liability |  | Non-Landfill Retirement Liability |  | Total
Balance at January 1, 2021 | $ | 48,412 |  |  | $ | 39,514 |  |  | $ | 87,926 |
Liabilities assumed in acquisitions | — |  |  | 451 |  |  | 451 |
New asset retirement obligations | 1,979 |  |  | — |  |  | 1,979 |
Accretion | 2,600 |  |  | 2,744 |  |  | 5,344 |
Changes in estimates recorded to consolidated statement of operations | 35 |  |  | 291 |  |  | 326 |
Changes in estimates recorded to consolidated balance sheet | 668 |  |  | 1,226 |  |  | 1,894 |
Expenditures | (4,420) |  |  | (461) |  |  | (4,881) |
Currency translation and other | — |  |  | (11) |  |  | (11) |
Balance at September 30, 2021 | $ | 49,274 |  |  | $ | 43,754 |  |  | $ | 93,028 |

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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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