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Reclamation (Tables) | 3 Months Ended
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Mar. 31, 2018
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 March 31,
In thousands | 2018 |  | 2017
Asset retirement obligation - Beginning | $ | 118,799 |  |  | $ | 86,754 |
Accretion | 2,545 |  |  | 2,064 |
Settlements | (496 | ) |  | (421 | )
Asset retirement obligation - Ending | $ | 120,848 |  |  | $ | 88,397 |

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