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Contingencies - Schedule of Contingencies Reserve Balance (Parenthetical) (Details) - New Idria Mercury Mine [Member] - USD ($) $ in Thousands | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | [1] | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | --- | ---
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Accrual for Environmental Loss Contingencies | $ 11,241 | [1] | $ 11,719 | $ 12,425 | $ 12,492 | $ 12,315 | $ 13,182
Estimated Insurance Recoveries | 7,000 |  |  |  |  |  |
Other Current Liabilities [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Accrual for Environmental Loss Contingencies | $ 6,400 |  |  |  |  |  |
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] | Other Accrued Liabilities, Current |  |  |  |  |  |
Other Noncurrent Liabilities [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Accrual for Environmental Loss Contingencies | $ 4,800 |  |  |  |  |  |
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] | Other Liabilities, Noncurrent |  |  |  |  |  |
Accounts Receivable [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Estimated Insurance Recoveries | $ 2,800 |  |  |  |  |  |
Other Noncurrent Assets [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Estimated Insurance Recoveries | $ 4,200 |  |  |  |  |  |
[1] | (1) As of June 30, 2025, Buckhorn has a total ending reserve balance of $11.2 million related to the New Idria Mine, of which $6.4 million is classified in Other current liabilities and $4.8 million in Other liabilities (long-term).

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