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Derivative Financial Instruments (Details Textual) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2016 USD ($) oz $ / oz | Mar. 31, 2015 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2015 USD ($) | Jan. 21, 2009
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |
Remaining ounces under royalty obligation | oz | 20,994 |  |  |  |
Fair Value Assumptions, Risk Free Interest Rate | 12.40% | 19.90% |  |  |
Gain (loss) on derivative instruments | $ (8,695,000) | $ (4,884,000) |  |  |
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 |
Realized losses | $ 3,000,000 | 4,200,000 |  |  |
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 |  |  |  |
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 | $ 600,000 | 900,000 |  |  |
Unrealized Gain (Loss) on Derivatives | 566,000 | 914,000 |  |  |
Embedded Derivative Financial Instruments [Member] |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |
Gain (loss) on derivative instruments | (4,878,000) | (1,545,000) |  |  |
Silver and gold options [Member] |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |
Gain (loss) on derivative instruments | (1,568,000) | (1,046,000) |  |  |
Unrealized Gain (Loss) on Derivatives |  | 0 | $ 200,000 |  |
Mark-to-market gains and (losses) on forward foreign exchange contract | $ (1,600,000) | $ (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 |  |  |  |
Derivative Instruments Settle in Year One [Member] | Silver put options purchased [Member] |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |
Derivative, Weighted Average Strike Price of Put Options | $ / oz | 15.00 |  |  |  |
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 | 438,573 |  |  |  |
Derivative Average Price | $ / oz | 15.36 |  |  |  |
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 | 38,773 |  |  |  |
Derivative Average Price | $ / oz | 1,183 |  |  |  |
Derivative Instruments Settle in Year One [Member] | Silver Put Options Sold [Member] |  |  |  |  |
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract] |  |  |  |  |
Notional ounces | oz | 300,000 |  |  |  |
Derivative, Weighted Average Strike Price of Put Options | $ / oz | 14.00 |  |  |  |
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, Asian Put Options | $ 100,000 |  |  |  |
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 | $ 6,827,000 |  |  | $ 4,957,000 |

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