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Reclamation (Tables) | 9 Months Ended
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Sep. 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 September 30, |  | Nine months ended September 30,
In thousands | 2019 |  | 2018 |  | 2019 |  | 2018
Asset retirement obligation - Beginning |  | $137,545 |  |  |  | $122,907 |  |  | $ | 133,508 |  |  | $ | 118,799 |
Accretion | 3,024 |  |  | 2,830 |  |  | 8,878 |  |  | 8,141 |
Settlements | (833 | ) |  | (1,171 | ) |  | (2,650 | ) |  | (2,374 | )
Asset retirement obligation - Ending |  | $139,736 |  |  |  | $124,566 |  |  | $ | 139,736 |  |  | $ | 124,566 |

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