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v3.19.1

Reclamation (Tables) | 3 Months Ended
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Mar. 31, 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 March 31,
In thousands | 2019 |  | 2018
Asset retirement obligation - Beginning | $ | 133,508 |  |  | $ | 118,799 |
Accretion | 2,895 |  |  | 2,545 |
Settlements | (662 | ) |  | (496 | )
Asset retirement obligation - Ending | $ | 135,741 |  |  | $ | 120,848 |

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