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Derivative Financial Instruments (Details Textual) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 USD ($) oz $ / oz | Mar. 31, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) oz $ / oz | Jun. 30, 2016 USD ($) | Jan. 21, 2009 oz
Palmarejo gold production royalty [Member] |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Production to be sold, percent |  |  |  |  |  | 50.00%
Payment made for gold on the end of royalty obligation | oz |  |  |  |  |  | 4,167
Concentrate Sales Contracts [Member] |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Unrealized Gain (Loss) on Derivatives and Commodity Contracts | $ | $ 0.8 |  | $ 0.6 | $ 0.6 | $ 1.2 |
Silver and gold options [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | $ |  |  | 0.1 |  | 1.6 |
ERROR in label resolution. |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net | $ |  | $ 0.0 | 0.9 |  | 5.8 |
Realized losses | $ |  |  | $ 4.3 |  | $ 7.3 |
Maximum [Member] | Palmarejo gold production royalty [Member] |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Payable ounces under royalty obligation | oz |  |  |  |  |  | 400,000
Derivative Instruments Settle in Year One [Member] | Silver concentrate sales agreements [Member] |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Outstanding provisionally priced sales consists of silver | oz | 118,361 |  |  | 118,361 |  |
Derivative Average Price | $ / oz | 16.85 |  |  | 16.85 |  |
Derivative Instruments Settle in Year One [Member] | Gold concentrates sales agreements [Member] |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Outstanding provisionally priced sales consists of Gold | oz | 32,602 |  |  | 32,602 |  |
Derivative Average Price | $ / oz | 1,262.67 |  |  | 1,262.67 |  |

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