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Reclamation (Tables) | 12 Months Ended
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Dec. 31, 2016
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 | 2016 |  | 2015
Asset retirement obligation - Beginning | $ | 82,072 |  |  | $ | 67,214 |
Accretion | 8,136 |  |  | 7,738 |
Additions and changes in estimates | 8,688 |  |  | 11,939 |
Settlements | (1,516 | ) |  | (4,819 | )
Asset retirement obligation - Ending | $ | 97,380 |  |  | $ | 82,072 |

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