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Derivative Financial Instruments (Details Textual) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2016 USD ($) oz $ / oz | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) oz $ / oz | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) | Jun. 30, 2016 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 | $ (961,000) | $ 5,786,000 | $ (13,235,000) | $ 3,657,000 |  |  |
Price per ounce under agreement | 416 |  | 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 |  |
Realized losses | $ 100,000 | 3,300,000 | $ 5,900,000 | 11,000,000 |  |  |
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% |  | 50.00% |  |  |  |
Annual Inflation Compounding Adjustment | 1.00% |  | 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 | $ 800,000 | 100,000 | $ 400,000 | 400,000 |  |  |
Unrealized Gain (Loss) on Derivatives | (784,000) | 82,000 | 378,000 | 373,000 |  |  |
Embedded Derivative Financial Instruments [Member] |  |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |  |
Gain (loss) on derivative instruments | (110,000) | 2,983,000 | (5,866,000) | 1,823,000 |  |  |
Silver and gold options [Member] |  |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |  |
Gain (loss) on derivative instruments | 0 | $ 1,051,000 | (1,582,000) | 1,238,000 |  |  |
Unrealized Gain (Loss) on Derivatives | 0 |  | $ 0 |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | $ 0 |  |  | $ 2,662,000 |  |  |
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 |  | 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 | 276,448 |  | 276,448 |  |  |  |
Derivative Average Price | $ / oz | 19.35 |  | 19.35 |  |  |  |
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 | 24,449 |  | 24,449 |  |  |  |
Derivative Average Price | $ / oz | 1,315 |  | 1,315 |  |  |  |
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 |  | $ 0 |  | $ 4,957,000 | $ 3,317,000 |

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