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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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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Contingencies - Additional Information (Details) - USD ($)				3 Months Ended			6 Months Ended		12 Months Ended	177 Months Ended
	Apr. 30, 2026	Mar. 18, 2025	Jul. 09, 2024	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2018	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2016	Jun. 30, 2026	Dec. 31, 2025
Loss Contingencies [Line Items]
Other current liabilities				$ 27,535,000			$ 27,535,000			$ 27,535,000	$ 30,894,000
Other liabilities				12,349,000			12,349,000			12,349,000	$ 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
Spartan and Spartan Mat [Member] \| Maximum [Member] \| Revenue Benchmark [Member] \| Product Concentration Risk [Member]
Loss Contingencies [Line Items]
Concentration risk percentage							1.00%
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	$ 7,000,000		$ 15,000,000
Pending Litigation [Member] \| New Idria Mercury Mine [Member] \| EPA Notice Letter [Member]
Loss Contingencies [Line Items]
Payments made										19,800,000
Insurance recoveries										10,100,000
Loss contingency, Loss in period										$ 29,100,000