v3.25.2
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).