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Reclamation (Tables) | 6 Months Ended
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Jun. 30, 2019
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation | Changes to the Company’s asset retirement obligations for its operating sites are as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
In thousands | 2019 |  | 2018 |  | 2019 |  | 2018
Asset retirement obligation - Beginning |  | $135,741 |  |  |  | $120,848 |  |  | $ | 133,508 |  |  | $ | 118,799 |
Accretion | 2,959 |  |  | 2,766 |  |  | 5,854 |  |  | 5,311 |
Settlements | (1,155 | ) |  | (707 | ) |  | (1,817 | ) |  | (1,203 | )
Asset retirement obligation - Ending |  | $137,545 |  |  |  | $122,907 |  |  | $ | 137,545 |  |  | $ | 122,907 |

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