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Contingencies - Schedule of Contingencies Reserve Balance (Details) - New Idria Mercury Mine [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Loss Contingencies [Line Items] |  |  |  |  |
Beginning reserve balance |  | $ 11,241 | $ 12,492 | $ 12,425 | $ 13,182
Changes in estimated environmental liability |  | 900 | 200 | 900 | 1,000
Payments made |  | (718) | (908) | (1,902) | (2,398)
Ending reserve balance | [1] | 11,423 | 11,784 | 11,423 | 11,784
Beginning receivable balance |  | 7,050 | 7,114 | 8,404 | 7,245
Changes in estimated insurance recovery |  | 900 | 700 | 900 | 1,700
Insurance recovery reimbursements |  | (483) | (621) | (1,837) | (1,752)
Ending receivable balance | [2] | $ 7,467 | $ 7,193 | $ 7,467 | $ 7,193
[1] | (1) As of September 30, 2025, Buckhorn has a total ending reserve balance of $11.4 million related to the New Idria Mine, of which $7.4 million is classified in Other current liabilities and $4.0 million in Other liabilities (long-term).
[2] | (2) As of September 30, 2025, Buckhorn has a total receivable balance related to the probable insurance recovery of $7.5 million, of which $4.2 million is classified in Other accounts receivable and $3.3 million is classified in Other assets (long-term).

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