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Amount of expense for newly incurred environmental loss contingencies. Includes, but is not limited to, remediation expense and interest accretion.

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Amount of cash outflow to settle environmental loss contingencies.

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Contingencies - Additional Information (Details) - USD ($)					3 Months Ended			9 Months Ended		12 Months Ended	180 Months Ended
	Aug. 27, 2026	Apr. 30, 2026	Mar. 18, 2025	Jul. 09, 2024	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2018	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2016	Sep. 30, 2026	Dec. 31, 2025
Loss Contingencies [Line Items]
Other current liabilities					$ 28,507,000			$ 28,507,000			$ 28,507,000	$ 30,894,000
Other liabilities					11,084,000			11,084,000			11,084,000	$ 14,916,000
New Idria Mercury Mine [Member]
Loss Contingencies [Line Items]
Financial assurance required to be provided to EPA to secure performance							$ 2,000,000
New Almaden Mine (Formerly Referred to as Guadalupe River Watershed) [Member] \| Natural Resource Damage Claim [Member]
Loss Contingencies [Line Items]
Total reserve					4,400,000			4,400,000			4,400,000
Other current liabilities					300,000			300,000			300,000
Other liabilities					4,100,000			4,100,000			4,100,000
Expense recognized					$ 0	$ 0		0	$ 0
Revised estimated project cost								9,000,000
New Almaden Mine (Formerly Referred to as Guadalupe River Watershed) [Member] \| Natural Resource Damage Claim [Member] \| Minimum [Member]
Loss Contingencies [Line Items]
Original estimated project costs										$ 3,300,000
New Almaden Mine (Formerly Referred to as Guadalupe River Watershed) [Member] \| Natural Resource Damage Claim [Member] \| Maximum [Member]
Loss Contingencies [Line Items]
Original estimated project costs										$ 4,400,000
Scepter Company [Member] \| Ryan Colvin [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value			$ 75,000
Signature Systems Group, LLC [Member] \| Spartan and Spartan Mat [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value	$ 6,900,000	$ 7,000,000		$ 15,000,000				$ 8,900,000
Pending Litigation [Member] \| New Idria Mercury Mine [Member] \| EPA Notice Letter [Member]
Loss Contingencies [Line Items]
Payments made											20,900,000
Insurance recoveries											11,100,000
Loss contingency, Loss in period											$ 31,000,000