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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).