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Reclamation (Tables) | 9 Months Ended
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Sep. 30, 2016
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation | Changes to the Company’s asset retirement obligations for operating sites are as follows:
| Three months ended September 30, |  | Nine months ended September 30,
In thousands | 2016 |  | 2015 |  | 2016 |  | 2015
Asset retirement obligation - Beginning | $ | 85,545 |  |  | $ | 87,601 |  |  | $ | 82,072 |  |  | $ | 67,214 |
Accretion | 2,059 |  |  | 2,038 |  |  | 6,027 |  |  | 5,652 |
Additions and changes in estimates | (239 | ) |  | — |  |  | (118 | ) |  | 18,270 |
Settlements | (183 | ) |  | (2,363 | ) |  | (799 | ) |  | (3,860 | )
Asset retirement obligation - Ending | $ | 87,182 |  |  | $ | 87,276 |  |  | $ | 87,182 |  |  | $ | 87,276 |

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