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v3.20.4

Reclamation (Tables) | 12 Months Ended
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Dec. 31, 2020
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation | Changes to the Company’s asset retirement obligations for its operating sites are as follows:
|  |  | Year Ended December 31,
In thousands |  |  |  |  | 2020 |  | 2019
Asset retirement obligation - Beginning |  |  |  |  | $ | 134,398 |  |  | $ | 133,508 |
Accretion |  |  |  |  | 11,574 |  |  | 11,968 |
Additions and changes in estimates |  |  |  |  | (6,132) |  |  | (7,538) |
Settlements |  |  |  |  | (2,720) |  |  | (3,540) |
Asset retirement obligation - Ending |  |  |  |  | $ | 137,120 |  |  | $ | 134,398 |

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