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Commitments and Contigencies (Details Textual) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) t | Oct. 31, 2017 USD ($) | Oct. 02, 2014 USD ($)
Palmarejo gold production royalty |  |  |
Business Acquisition [Line Items] |  |  |
Production to be sold, percent |  |  | 50.00%
Price per ounce under agreement |  |  | $ 800
Aggregate deposit to be received |  |  | $ 22,000,000
Palmarejo Gold Stream Agreement, Deferred Revenue Unamortized Balance | $ 14,900,000 |  |
JDS Silver Holdings, Ltd. |  |  |
Business Acquisition [Line Items] |  |  |
Silvertip acquisition contingent consideration |  | $ 50,000,000 |
Number of milestones | 2 |  |
JDS Silver Holdings, Ltd. | First Milestone |  |  |
Business Acquisition [Line Items] |  |  |
Silvertip acquisition contingent consideration |  | 25,000,000 |
Sustained minim and milling per day (in tones) | t | 1,000 |  |
JDS Silver Holdings, Ltd. | Second Milestone |  |  |
Business Acquisition [Line Items] |  |  |
Silvertip acquisition contingent consideration |  | 25,000,000.0 |
Maximum payment |  | $ 25,000,000 |
Tonnes of Resource Added | t | 3,700,000 |  |
Amount of resource required (in tonnes) | t | 300,000 |  |
Commitment amount per resource amount reached | $ 5,000,000 |  |
Minimum Resource Tonnes Milestone | t | 2,500,000 |  |

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