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Contingencies - Schedule of Contingencies Reserve Balance (Details) - New Idria Mercury Mine [Member] - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Loss Contingencies [Line Items] |  |  |  |  |
Beginning reserve balance |  | $ 11,719 | $ 12,315 | $ 12,425 | $ 13,182
Changes in estimated environmental liability |  | 0 | 800 | 0 | 800
Payments made |  | (478) | (623) | (1,184) | (1,490)
Ending reserve balance | [1] | 11,241 | 12,492 | 11,241 | 12,492
Beginning receivable balance |  | 7,487 | 7,020 | 8,404 | 7,245
Changes in estimated insurance recovery |  | 0 | 700 | 0 | 1,000
Insurance recovery reimbursements |  | (437) | (606) | (1,354) | (1,131)
Ending receivable balance | [2] | $ 7,050 | $ 7,114 | $ 7,050 | $ 7,114
[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).
[2] | (2) As of June 30, 2025, Buckhorn has a total receivable balance related to the probable insurance recovery of $7.0 million, of which $2.8 million is classified in Other a ccounts receivable and $4.2 million is classified in Other assets (long-term).

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