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Summary of Significant Accounting Policies (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2019 | Dec. 31, 2016 | Oct. 02, 2014
Business Acquisition [Line Items] |  |  |  |  |  |
Aggregate deposit to be received |  |  |  |  | $ 20,000,000.0 |
Production to be sold, percent |  |  |  |  | 50.00% |
Price per ounce under agreement |  |  |  |  | $ 800 |
Adoption of new accounting standard | $ 65,000,000.0 |  |  |  |  |
Drilling and Related Costs Capitalized | 7,500,000 | $ 18,600,000 |  |  |  |
Impairment of long-lived assets | 250,814,000 | 0 | $ 0 |  |  |
Write-downs | 43,600,000 | 201,500,000 | 5,700,000 |  |  |
Revenue liability | 11,061,000 | 12,918,000 | $ 14,883,000 |  | $ 19,281,000 |
Debt Securities, Held-to-maturity, Restricted | 8,800,000 | 12,300,000 |  |  |  |
Restricted Cash Equivalents | $ 1,373,000 | $ 2,988,000 |  |  |  |
Palmarejo gold production royalty |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Aggregate deposit to be received |  |  |  |  |  | $ 22,000,000.0
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 |  |  |  |  |
Kensington |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Revenue liability | $ 15,000,000.0 |  |  | $ 25,000,000.0 |  |

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