Asset And Liabilities Held For Sale (Details) $ in Thousands, shares in Millions		Oct. 27, 2021 USD ($) $ / oz shares	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Subsequent Event [Line Items]
Debt			$ 31,384	$ 22,074
Subsequent Event | Discontinued Operations, Disposed of by Sale | La Preciosa [Member]
Subsequent Event [Line Items]
Disposal Group, Including Discontinued Operation, Consideration		$ 15,000
Disposal Group, Including Discontinued Operation, Consideration, Note Receivable		$ 5,000
Disposal Group, Including Discontinued Operation, Equity Consideration | shares		14.0
Disposal Group, Including Discontinued Operation, Consideration, Equity Consideration Premium		25.00%
Disposal Group, Including Discontinued Operation, Deferred Cash Consideration		$ 8,800
Disposal Group, Including Discontinued Operation, Contingent Consideration, Payments Per Silver Equivalent | $ / oz		0.25
Disposal Group, Including Discontinued Operation, Contingent Consideration, Maximum		$ 50,000
Subsequent Event | Gloria And Abundancia | Discontinued Operations, Disposed of by Sale | La Preciosa [Member]
Subsequent Event [Line Items]
Disposal Group, Including Discontinued Operation, Consideration, Royalties On Properties		1.25%
Subsequent Event | Areas Other Than Gloria And Abundancia | Discontinued Operations, Disposed of by Sale | La Preciosa [Member]
Subsequent Event [Line Items]
Disposal Group, Including Discontinued Operation, Consideration, Royalties On Properties		2.00%
Revolving Credit Facility
Subsequent Event [Line Items]
Debt	[1]		$ 0	$ 0

[1] Unamortized debt issuance costs of $2.5 million and $1.5 million at September 30, 2021 and December 31, 2020, respectively, included in Other Non-Current Assets