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Income and Mining Taxes - Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Disclosure [Abstract] |  |  |
Operating loss carryforwards, domestic | $ 623,100,000 |  |
Operating loss carryforwards, state and local | $ 465,600,000 |  |
Expiration term | 20 years |  |
Operating loss carryforwards subject to expiration | $ 318,500,000 |  |
Operating loss carryforwards not subject to expiration | 304,600,000 |  |
Unrecognized tax benefits | 2,000 | $ 4,000 | $ 300,000
Unrecognized income tax liability | 100,000 |  |
Income-tax related interest and penalties | 0 | 0 | 400,000
Tax (expense) benefit | $ 35,156,000 | $ 14,658,000 | $ 34,958,000

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