Contingencies - Additional Information (Details) - USD ($)		3 Months Ended				6 Months Ended		12 Months Ended		141 Months Ended	254 Months Ended
	Feb. 14, 2023	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Dec. 31, 2018	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2020	Dec. 31, 2016	Jun. 30, 2023	Feb. 14, 2014	Dec. 31, 2022
Loss Contingencies [Line Items]
Loss contingency, Loss in period		$ 1,800,000		$ 600,000		$ 2,300,000	$ 1,300,000
Accrual for Environmental Loss Contingencies, Revision in Estimates								$ 2,000,000
Other current liabilities		31,337,000				31,337,000				$ 31,337,000		$ 26,380,000
Other liabilities		11,414,000				11,414,000				11,414,000		15,270,000
EPA Notice Letter [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies, Revision in Estimates			$ 1,900,000
New Idria Mercury Mine [Member]
Loss Contingencies [Line Items]
Financial assurance required to be provided to EPA to secure performance					$ 2,000,000
Expected insurance recoveries		6,200,000				6,200,000				6,200,000		$ 6,000,000
Insurance recovery reimbursements		100,000				1,000,000
Additional estimated insurance recoveries		100,000				1,200,000
New Almaden Mine (Formerly Referred to as Guadalupe River Watershed) [Member] | Natural Resource Damage Claim [Member]
Loss Contingencies [Line Items]
Total reserve		4,500,000				4,500,000				4,500,000
Other current liabilities		300,000				300,000				300,000
Other liabilities		4,200,000				4,200,000				4,200,000
Expense recognized		0		0		0	0
Revised estimated project total costs, Low Estimate									$ 3,300,000
Revised estimated project costs, High Estimate									$ 4,400,000
Original estimated project costs						9,000,000
Other Noncurrent Assets [Member] | New Idria Mercury Mine [Member]
Loss Contingencies [Line Items]
Expected insurance recoveries		3,100,000				3,100,000				3,100,000
Accounts Receivable [Member] | New Idria Mercury Mine [Member]
Loss Contingencies [Line Items]
Expected insurance recoveries		3,100,000				3,100,000				3,100,000
Scepter Company [Member] | Ms.McCartney [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value	$ 30,000
Pending Litigation [Member] | New Idria Mercury Mine [Member] | EPA Notice Letter [Member]
Loss Contingencies [Line Items]
Expected insurance recoveries		7,200,000				7,200,000				7,200,000
Loss contingencies, payments										8,900,000
Insurance recoveries										3,000,000
Loss contingency, Loss in period		1,800,000		$ 600,000		2,300,000	$ 1,300,000			19,000,000	$ 1,600,000
Total reserve		12,100,000				12,100,000				12,100,000
Other current liabilities		7,600,000				7,600,000				7,600,000
Other liabilities		$ 4,500,000				$ 4,500,000				$ 4,500,000