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Reclamation (Tables) | 6 Months Ended
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Jun. 30, 2017
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 June 30, |  | Six months ended June 30,
In thousands | 2017 |  | 2016 |  | 2017 |  | 2016
Asset retirement obligation - Beginning | $ | 99,240 |  |  | $ | 83,974 |  |  | $ | 97,380 |  |  | $ | 82,072 |
Accretion | 2,397 |  |  | 2,009 |  |  | 4,735 |  |  | 3,968 |
Additions and changes in estimates | — |  |  | (130 | ) |  | — |  |  | 121 |
Settlements | (510 | ) |  | (308 | ) |  | (988 | ) |  | (616 | )
Asset retirement obligation - Ending | $ | 101,127 |  |  | $ | 85,545 |  |  | $ | 101,127 |  |  | $ | 85,545 |

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