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Reclamation (Tables) | 9 Months Ended
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Sep. 30, 2021
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 | 2021 |  | 2020 |  | 2021 |  | 2020
Asset retirement obligation - Beginning | $ | 141,205 |  |  | $ | 138,904 |  |  | $ | 137,120 |  |  | $ | 134,543 |
Accretion | 2,984 |  |  | 2,924 |  |  | 8,769 |  |  | 8,591 |
Settlements | (1,406) |  |  | (930) |  |  | (3,106) |  |  | (2,236) |
Asset retirement obligation - Ending | $ | 142,783 |  |  | $ | 140,898 |  |  | $ | 142,783 |  |  | $ | 140,898 |

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