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REMEDIAL LIABILITIES (Tables) | 6 Months Ended
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Jun. 30, 2017
Environmental Remediation Obligations [Abstract] |
Changes to remedial liabilities | The changes to remedial liabilities for the six months ended June 30, 2017 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, 2017 | $ | 1,777 |  |  | $ | 64,151 |  |  | $ | 62,079 |  |  | $ | 128,007 |
Measurement period adjustments from prior period acquisitions | — |  |  | — |  |  | 504 |  |  | 504 |
Accretion | 43 |  |  | 1,332 |  |  | 967 |  |  | 2,342 |
Changes in estimates recorded to statement of operations | (36 | ) |  | (120 | ) |  | 289 |  |  | 133 |
Expenditures | (19 | ) |  | (2,068 | ) |  | (3,205 | ) |  | (5,292 | )
Currency translation and other | (1 | ) |  | 2,712 |  |  | (2,246 | ) |  | 465 |
Balance at June 30, 2017 | $ | 1,764 |  |  | $ | 66,007 |  |  | $ | 58,388 |  |  | $ | 126,159 |

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