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CLOSURE AND POST-CLOSURE LIABILITIES (Tables) | 12 Months Ended
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Dec. 31, 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, 2020 through December 31, 2021 were as follows (in thousands):
| Landfill Retirement Liability |  | Non-Landfill Retirement Liability |  | Total
Balance at January 1, 2020 | $ | 39,401 |  |  | $ | 36,250 |  |  | $ | 75,651 |
Liabilities assumed in acquisitions | — |  |  | 265 |  |  | 265 |
New asset retirement obligations | 2,101 |  |  | — |  |  | 2,101 |
Accretion | 3,254 |  |  | 3,399 |  |  | 6,653 |
Changes in estimates recorded to consolidated statement of operations | 6,465 |  |  | 103 |  |  | 6,568 |
Changes in estimates recorded to consolidated balance sheet | 481 |  |  | 201 |  |  | 682 |
Expenditures | (3,445) |  |  | (753) |  |  | (4,198) |
Currency translation and other | 155 |  |  | 49 |  |  | 204 |
Balance at December 31, 2020 | 48,412 |  |  | 39,514 |  |  | 87,926 |
Liabilities assumed in acquisitions | — |  |  | 1,446 |  |  | 1,446 |
New asset retirement obligations | 2,443 |  |  | — |  |  | 2,443 |
Accretion | 3,655 |  |  | 3,702 |  |  | 7,357 |
Changes in estimates recorded to consolidated statement of operations | 2,287 |  |  | 396 |  |  | 2,683 |
Changes in estimates recorded to consolidated balance sheet | 2,297 |  |  | 1,415 |  |  | 3,712 |
Expenditures | (5,818) |  |  | (784) |  |  | (6,602) |
Currency translation and other | 149 |  |  | (11) |  |  | 138 |
Balance at December 31, 2021 | $ | 53,425 |  |  | $ | 45,678 |  |  | $ | 99,103 |
Schedule of Expected Payments Related to Asset Retirement Obligations | Anticipated payments (based on current estimated costs and anticipated timing of necessary regulatory approvals to commence work on closure and post-closure activities) for each of the next five years and thereafter are as follows (in thousands):
Years ending December 31, |
2022 | $ | 12,612 |
2023 | 11,452 |
2024 | 13,460 |
2025 | 10,791 |
2026 | 8,143 |
Thereafter | 276,236 |
Undiscounted closure and post-closure liabilities | 332,694 |
Less: Discount at credit-adjusted risk-free rate | (158,941) |
Less: Undiscounted estimated closure and post-closure liabilities relating to airspace not yet consumed | (74,650) |
Present value of closure and post-closure liabilities | $ | 99,103 |

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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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