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Derivative Financial Instruments (Details Textual) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2016 USD ($) oz $ / oz | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) oz $ / oz | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) | Mar. 31, 2016 USD ($) | Jan. 21, 2009
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |  |
Fair Value Assumptions, Risk Free Interest Rate |  |  | 8.33% |  | 19.90% |  |
Gain (loss) on derivative instruments | $ (3,579,000) | $ 2,754,000 | $ (12,274,000) | $ (2,130,000) |  |  |
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 | $ 4,300,000 | 3,600,000 | $ 7,300,000 | 11,700,000 |  |  |
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 | $ 600,000 | 600,000 | $ 1,200,000 | 300,000 |  |  |
Unrealized Gain (Loss) on Derivatives | 597,000 | (623,000) | 1,163,000 | 291,000 |  |  |
Embedded Derivative Financial Instruments [Member] |  |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |  |
Gain (loss) on derivative instruments | (878,000) | 385,000 | (5,756,000) | (1,160,000) |  |  |
Silver and gold options [Member] |  |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |  |
Gain (loss) on derivative instruments | (14,000) | 1,232,000 | (1,582,000) | 185,000 |  |  |
Unrealized Gain (Loss) on Derivatives | 0 | 1,200,000 | 0 | 1,000,000 |  |  |
Mark-to-market gains and (losses) on forward foreign exchange contract | $ (1,600,000) | $ 0 | $ (51,000) | $ (800,000) |  |  |
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 | 547,940 |  | 547,940 |  |  |  |
Derivative Average Price | $ / oz | 18.28 |  | 18.28 |  |  |  |
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 | 34,876 |  | 34,876 |  |  |  |
Derivative Average Price | $ / oz | 1,257 |  | 1,257 |  |  |  |
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 | $ 3,317,000 |  | $ 3,317,000 |  | $ 4,957,000 | $ 6,827,000 |

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