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Reclamation (Tables) | 9 Months Ended
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Sep. 30, 2015
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation |
| Three months ended September 30, |  | Nine months ended September 30,
In thousands | 2015 |  | 2014 |  | 2015 |  | 2014
Asset retirement obligation - Beginning | $ | 87,601 |  |  | $ | 59,795 |  |  | $ | 67,214 |  |  | $ | 57,454 |
Accretion | 2,038 |  |  | 1,452 |  |  | 5,652 |  |  | 4,205 |
Additions and changes in estimates | — |  |  | — |  |  | 18,270 |  |  | — |
Settlements | (2,363 | ) |  | (58 | ) |  | (3,860 | ) |  | (470 | )
Asset retirement obligation - Ending | $ | 87,276 |  |  | $ | 61,189 |  |  | $ | 87,276 |  |  | $ | 61,189 |

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