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Reclamation (Tables) | 12 Months Ended
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Dec. 31, 2017
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation | Changes to the Company’s asset retirement obligations for operating sites are as follows:
| Year ended December 31,
In thousands | 2017 |  | 2016
Asset retirement obligation - Beginning | $ | 86,754 |  |  | $ | 71,763 |
Accretion | 8,769 |  |  | 7,030 |
Additions and changes in estimates | 25,370 |  |  | 9,389 |
Settlements | (2,094 | ) |  | (1,428 | )
Asset retirement obligation - Ending | $ | 118,799 |  |  | $ | 86,754 |

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