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REMEDIAL LIABILITIES (Tables) | 3 Months Ended
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Mar. 31, 2018
Environmental Remediation Obligations [Abstract] |
Changes to remedial liabilities | The changes to remedial liabilities for the three months ended March 31, 2018 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, 2018 | $ | 1,800 |  |  | $ | 65,342 |  |  | $ | 57,326 |  |  | $ | 124,468 |
Accretion | 21 |  |  | 672 |  |  | 472 |  |  | 1,165 |
Changes in estimates recorded to statement of operations | — |  |  | (24 | ) |  | (568 | ) |  | (592 | )
Expenditures | (12 | ) |  | (826 | ) |  | (1,370 | ) |  | (2,208 | )
Currency translation and other | — |  |  | (9 | ) |  | (377 | ) |  | (386 | )
Balance at March 31, 2018 | $ | 1,809 |  |  | $ | 65,155 |  |  | $ | 55,483 |  |  | $ | 122,447 |

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