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Derivative Financial Instruments (Details Textual) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2016 USD ($) oz | Sep. 30, 2015 USD ($) | Dec. 31, 2016 USD ($) oz $ / oz | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Jan. 21, 2009
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Fair Value Assumptions, Risk Free Interest Rate |  |  |  | 19.90% |  |
Gain (loss) on derivative instruments |  |  | $ (11,581,000) | $ 5,202,000 | $ 3,618,000 |
Price per ounce under agreement |  |  | 416 |  |  |
Franco-Nevada warrant [Member] |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Fair value liability of the embedded derivative |  |  |  | 5,000,000 |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net |  |  | 5,900,000 | 17,000,000 | 18,400,000 |
Realized losses |  |  | $ 10,800,000 | 13,900,000 | 20,400,000 |
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 |  | 4,167 |  |  |
Percentage of Gold Production |  |  | 50.00% |  |  |
Annual Inflation Compounding Adjustment |  |  | 1.00% |  |  |
Concentrate Sales Contracts [Member] |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Unrealized Gain (Loss) on Derivatives and Commodity Contracts | $ 300,000 | $ 100,000 |  | 300,000 |  |
Unrealized Gain (Loss) on Derivatives |  |  | $ (254,000) | 296,000 | (123,000) |
Embedded Derivative Financial Instruments [Member] |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Gain (loss) on derivative instruments |  |  | (5,866,000) | 3,101,000 | (2,001,000) |
Silver and gold options [Member] |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Gain (loss) on derivative instruments |  |  |  | 1,300,000 | 600,000 |
Unrealized Gain (Loss) on Derivatives |  |  | 0 |  | 1,500,000 |
Derivative, Gain (Loss) on Derivative, Net |  |  | $ (1,582,000) | 1,283,000 | 1,058,000 |
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 |  |  | 354,771 |  |  |
Derivative Average Price | $ / oz |  |  | 16.35 |  |  |
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 |  |  | 25,505 |  |  |
Derivative Average Price | $ / oz |  |  | 1,208 |  |  |
Palmarejo Royalty Obligation [Member] |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value |  |  | $ 0 | $ 4,957,000 | $ 21,912,000 |

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