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Contingencies - Schedule of Contingencies Reserve Balance (Parenthetical) (Details) - New Idria Mercury Mine [Member] - USD ($)
$ in Thousands
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
 [1]
Jun. 30, 2024
Dec. 31, 2023
Loss Contingencies [Line Items]            
Accrual for Environmental Loss Contingencies $ 11,423 [1] $ 11,241 $ 12,425 $ 11,784 $ 12,492 $ 13,182
Estimated Insurance Recoveries 7,500          
Other Current Liabilities [Member]            
Loss Contingencies [Line Items]            
Accrual for Environmental Loss Contingencies $ 7,400          
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 $ 4,000          
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Noncurrent          
Accounts Receivable [Member]            
Loss Contingencies [Line Items]            
Estimated Insurance Recoveries $ 4,200          
Other Noncurrent Assets [Member]            
Loss Contingencies [Line Items]            
Estimated Insurance Recoveries $ 3,300          
[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).