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REMEDIAL LIABILITIES (Tables) | 6 Months Ended
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Jun. 30, 2021
Environmental Remediation Obligations [Abstract] |
Schedule of Changes to Remedial Liabilities | The changes to remedial liabilities from January 1, 2021 through June 30, 2021 were as follows (in thousands):
| Remedial Liabilities for Landfill Sites |  | Remedial Liabilities for Inactive Sites |  | Remedial Liabilities (Including Superfund) for Non-Landfill Operations |  | Total
Balance at January 1, 2021 | $ | 1,865 |  |  | $ | 63,060 |  |  | $ | 49,888 |  |  | $ | 114,813 |
Accretion | 45 |  |  | 1,320 |  |  | 836 |  |  | 2,201 |
Changes in estimates recorded to consolidated statement of operations | (22) |  |  | 312 |  |  | (145) |  |  | 145 |
Expenditures | (24) |  |  | (2,833) |  |  | (2,255) |  |  | (5,112) |
Currency translation and other | — |  |  | (805) |  |  | 1,212 |  |  | 407 |
Balance at June 30, 2021 | $ | 1,864 |  |  | $ | 61,054 |  |  | $ | 49,536 |  |  | $ | 112,454 |

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