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CLOSURE AND POST-CLOSURE LIABILITIES (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2019 through December 31, 2020 were as follows (in thousands):
| Landfill Retirement Liability |  | Non-Landfill Retirement Liability |  | Total
Balance at January 1, 2019 | $ | 37,809 |  |  | $ | 32,122 |  |  | $ | 69,931 |
Liabilities assumed in acquisitions | — |  |  | 220 |  |  | 220 |
New asset retirement obligations | 2,705 |  |  | — |  |  | 2,705 |
Accretion | 2,772 |  |  | 2,829 |  |  | 5,601 |
Changes in estimates recorded to consolidated statement of operations | 248 |  |  | 2,437 |  |  | 2,685 |
Changes in estimates recorded to consolidated balance sheet | 3,303 |  |  | 562 |  |  | 3,865 |
Expenditures | (7,718) |  |  | (2,121) |  |  | (9,839) |
Currency translation and other | 282 |  |  | 201 |  |  | 483 |
Balance at December 31, 2019 | 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 |
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):
Year ending December 31, |
2021 | $ | 14,941 |
2022 | 7,816 |
2023 | 16,181 |
2024 | 6,868 |
2025 | 5,628 |
Thereafter | 269,477 |
Undiscounted closure and post-closure liabilities | 320,911 |
Less: Discount at credit-adjusted risk-free rate | (159,164) |
Less: Undiscounted estimated closure and post-closure liabilities relating to airspace not yet consumed | (73,821) |
Present value of closure and post-closure liabilities | $ | 87,926 |

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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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