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Derivative Financial Instruments (Details Textual) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) oz $ / oz | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) oz $ / oz | Sep. 30, 2014 USD ($) | Dec. 31, 2014 USD ($) oz $ / XAU $ / XAG | Jan. 21, 2009
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Gain (loss) on derivative instruments | $ 5,786,000 | $ 16,105,000 | $ 3,657,000 | $ (3,611,000) |  |
Fair Value Assumptions, Risk Free Interest Rate | 19.49% | 11.80% |  |  |  |
Price per ounce under agreement | $ 412 |  | $ 412 |  |  |
Put Option [Member] |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Contract expiration date |  |  | 3 years |  |  |
Franco-Nevada warrant [Member] |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Fair value liability of the embedded derivative |  |  |  |  | $ 21,900,000 |
Realized losses | $ (3,300,000) | $ (5,000,000) | $ (11,000,000) | (16,600,000) |  |
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 |  |  |
Remaining ounces under royalty obligation | oz | 45,996 |  | 45,996 |  |  |
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 | $ 82,000 | (684,000) | $ 373,000 | 188,000 |  |
Gold Put Purchase and Call Sold Options Net [Member] |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Derivative Liability, Fair Value |  |  |  |  | 1,039,000 |
Commodity [Member] |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Mark-to-market gains and (losses) on forward foreign exchange contract |  |  | 900,000 |  |  |
Embedded Derivative Financial Instruments [Member] |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Gain (loss) on derivative instruments | 2,983,000 | 8,736,000 | 1,823,000 | (6,560,000) |  |
Derivative Liability, Fair Value |  |  |  |  | $ 21,912,000 |
Silver and gold options [Member] |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Gain (loss) on derivative instruments | 1,051,000 | 3,081,000 | 1,238,000 | 213,000 |  |
Mark-to-market gains and (losses) on forward foreign exchange contract | $ (1,051,000) |  | $ (2,662,000) | $ (1,300,000) |  |
Unrealized Gain (Loss) on Derivatives |  | $ 3,100,000 |  |  |  |
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] | Gold Put Option [Member] |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Weighted Average Strike Price of Put Options | $ / XAU |  |  |  |  | 1,050 |
Derivative Instruments Settle in Year One [Member] | Silver concentrate sales agreements [Member] |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Derivative, Notional Amount | $ (8,234,000) |  | $ (8,234,000) |  |  |
Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Outstanding provisionally priced sales consists of silver | oz | 562,063 |  | 562,063 |  |  |
Derivative Average Price | $ / oz | 14.65 |  | 14.65 |  |  |
Derivative Instruments Settle in Year One [Member] | Gold concentrates sales agreements [Member] |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Derivative, Notional Amount | $ (44,812,000) |  | $ (44,812,000) |  |  |
Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Outstanding provisionally priced sales consists of Gold | oz | 39,069 |  | 39,069 |  |  |
Derivative Average Price | $ / oz | 1,147 |  | 1,147 |  |  |
Derivative Instruments Settle in Year One [Member] | Kensington Term Facility [Member] | Gold put options purchased [Member] | Put Option [Member] |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Weighted Average Strike Price of Put Options | $ / XAU |  |  |  |  | 1,200 |
Derivative Instruments Settle in Year One [Member] | Kensington Term Facility [Member] | Silver put options purchased [Member] | Put Option [Member] |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Weighted Average Strike Price of Put Options | $ / XAG |  |  |  |  | 18.00 |
Derivative Financial Instruments, Assets [Member] | Gold put options purchased [Member] |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Notional ounces | oz |  |  |  |  | 24,000 |
Derivative Financial Instruments, Assets [Member] | Silver put options purchased [Member] |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Notional ounces | oz |  |  |  |  | 1,300,000 |
Derivative Instruments Settle in Year Two [Member] | Silver concentrate sales agreements [Member] |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Derivative, Notional Amount | $ 0 |  | $ 0 |  |  |
Notional ounces | oz | 0 |  | 0 |  |  |
Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Derivative Average Price | $ / oz | 0 |  | 0 |  |  |
Derivative Instruments Settle in Year Two [Member] | Gold concentrates sales agreements [Member] |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Derivative, Notional Amount | $ 0 |  | $ 0 |  |  |
Notional ounces | oz | 0 |  | 0 |  |  |
Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Derivative Average Price | $ / oz | 0 |  | 0 |  |  |
Derivative Instruments Settle in Year Two [Member] | Silver Put Options Sold [Member] |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Weighted Average Strike Price of Put Options | $ / XAG |  |  |  |  | 16.00 |
Derivative Instruments Settle Thereafter [Member] | Silver concentrate sales agreements [Member] |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Derivative, Notional Amount | $ 0 |  | $ 0 |  |  |
Notional ounces | oz | 0 |  | 0 |  |  |
Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Derivative Average Price | $ / oz | 0 |  | 0 |  |  |
Derivative Instruments Settle Thereafter [Member] | Gold concentrates sales agreements [Member] |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Derivative, Notional Amount | $ 0 |  | $ 0 |  |  |
Notional ounces | oz | 0 |  | 0 |  |  |
Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Derivative Average Price | $ / oz | 0 |  | 0 |  |  |
Prepaid Expenses and Other Current Assets [Member] |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Fair value of the contract | $ 120,000 |  | $ 120,000 |  | $ 3,925,000 |
Prepaid Expenses and Other Current Assets [Member] | Gold Put Purchase and Call Sold Options Net [Member] |  |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |  |
Fair value of the contract |  |  |  |  | $ 3,882,000 |

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