Summary of Significant Accounting Policies (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 2021	Dec. 31, 2018	Oct. 02, 2014
Business Acquisition [Line Items]
Drilling and Related Costs Capitalized	$ 19,900,000	$ 8,000,000
Impairment of long-lived assets	0	0	$ 250,814,000
Certificates of Deposit, at Carrying Value	9,100,000	9,500,000
Inventory Write-down	38,596,000	16,821,000	69,246,000
Certificates of Deposit, at Carrying Value	9,100,000	9,500,000
June 2021 Recovery Rate
Business Acquisition [Line Items]
Recovery Rate Adjustment, Cost Applicable to Sales	7,200,000
Recovery Rate Adjustment, Amortization	1,200,000
December 2021 Recovery Rate
Business Acquisition [Line Items]
Recovery Rate Adjustment, Cost Applicable to Sales	8,600,000
Recovery Rate Adjustment, Amortization	2,200,000
Rochester [Member]
Business Acquisition [Line Items]
Inventory Write-down	8,400,000
Rochester [Member] | Cost of Sales
Business Acquisition [Line Items]
Inventory Write-down	$ 7,300,000
Palmarejo gold production royalty
Business Acquisition [Line Items]
Aggregate deposit to be received						$ 22,000,000
Production to be sold, percent						50.00%
Price per ounce under agreement						$ 800
Building and Building Improvements | Minimum
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life	7 years
Building and Building Improvements | Maximum
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life	30 years
Machinery and Equipment | Minimum
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Machinery and Equipment | Maximum
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Property, Plant and Equipment [Member] | Silvertip [Member]
Business Acquisition [Line Items]
Impairment of long-lived assets			43,600,000
Mine Development [Member] | Silvertip [Member]
Business Acquisition [Line Items]
Impairment of long-lived assets			201,500,000
Other Noncurrent Assets [Member] | Silvertip [Member]
Business Acquisition [Line Items]
Impairment of long-lived assets			5,700,000
Kensington
Business Acquisition [Line Items]
Revenue liability	$ 15,016,000	15,003,000	$ 15,009,000		$ 0
Kensington | December 2021 Prepayment
Business Acquisition [Line Items]
Revenue liability		15,000,000
Kensington | December 2020 Prepayment [Member]
Business Acquisition [Line Items]
Revenue liability		$ 15,000,000		$ 15,000,000