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Derivative Financial Instruments (Details) | 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 $ / XAU $ / XAG
Derivative [Line Items] |  |  |  |  |
Gain (loss) on derivative instruments | $ 5,786,000 | $ 16,105,000 | $ 3,657,000 | $ (3,611,000) |
Derivative instruments Settlement |  |  |  |  |
Price per ounce under agreement | 412 |  | 412 |  |
Palmarejo gold production royalty [Member] | 2013 [Member] |  |  |  |  |
Derivative instruments Settlement |  |  |  |  |
Derivative, notional amount | 11,760,000 |  | 11,760,000 |  |
Price per ounce under agreement | $ 706 |  | $ 706 |  |
Notional ounces | oz | 16,668 |  | 16,668 |  |
Palmarejo gold production royalty [Member] | 2014 [Member] |  |  |  |  |
Derivative instruments Settlement |  |  |  |  |
Derivative, notional amount | $ 20,543,000 |  | $ 20,543,000 |  |
Price per ounce under agreement | $ 700 |  | $ 700 |  |
Notional ounces | oz | 29,328 |  | 29,328 |  |
Palmarejo gold production royalty [Member] | Thereafter [Member] |  |  |  |  |
Derivative instruments Settlement |  |  |  |  |
Derivative, notional amount | $ 0 |  | $ 0 |  |
Price per ounce under agreement | $ 0 |  | $ 0 |  |
Notional ounces | oz | 0 |  | 0 |  |
Silver concentrate sales agreements [Member] | 2013 [Member] |  |  |  |  |
Derivative instruments Settlement |  |  |  |  |
Derivative, notional amount | $ 8,234,000 |  | $ 8,234,000 |  |
Derivative average price | $ / oz | 14.65 |  | 14.65 |  |
Outstanding Provisionally Priced Sales Consists of Silver | oz | 562,063 |  | 562,063 |  |
Silver concentrate sales agreements [Member] | 2014 [Member] |  |  |  |  |
Derivative instruments Settlement |  |  |  |  |
Derivative, notional amount | $ 0 |  | $ 0 |  |
Notional ounces | oz | 0 |  | 0 |  |
Derivative average price | $ / oz | 0 |  | 0 |  |
Silver concentrate sales agreements [Member] | Thereafter [Member] |  |  |  |  |
Derivative instruments Settlement |  |  |  |  |
Derivative, notional amount | $ 0 |  | $ 0 |  |
Notional ounces | oz | 0 |  | 0 |  |
Derivative average price | $ / oz | 0 |  | 0 |  |
Gold concentrates sales agreements [Member] | 2013 [Member] |  |  |  |  |
Derivative instruments Settlement |  |  |  |  |
Derivative, notional amount | $ 44,812,000 |  | $ 44,812,000 |  |
Derivative average price | $ / oz | 1,147 |  | 1,147 |  |
Outstanding Provisionally Priced Sales Consists of Gold | oz | 39,069 |  | 39,069 |  |
Gold concentrates sales agreements [Member] | 2014 [Member] |  |  |  |  |
Derivative instruments Settlement |  |  |  |  |
Derivative, notional amount | $ 0 |  | $ 0 |  |
Notional ounces | oz | 0 |  | 0 |  |
Derivative average price | $ / oz | 0 |  | 0 |  |
Gold concentrates sales agreements [Member] | Thereafter [Member] |  |  |  |  |
Derivative instruments Settlement |  |  |  |  |
Derivative, notional amount | $ 0 |  | $ 0 |  |
Notional ounces | oz | 0 |  | 0 |  |
Derivative average price | $ / oz | 0 |  | 0 |  |
Gold Put Option [Member] | 2013 [Member] |  |  |  |  |
Derivative instruments Settlement |  |  |  |  |
Weighted Average Strike Price of Put Options | $ / XAU |  |  |  |  | 1,050
Silver Put Options Sold [Member] | 2014 [Member] |  |  |  |  |
Derivative instruments Settlement |  |  |  |  |
Weighted Average Strike Price of Put Options | $ / XAG |  |  |  |  | 16.00
Line of Credit [Member] | Put Option [Member] | Gold put options purchased [Member] | 2013 [Member] |  |  |  |  |
Derivative instruments Settlement |  |  |  |  |
Weighted Average Strike Price of Put Options | $ / XAU |  |  |  |  | 1,200
Line of Credit [Member] | Put Option [Member] | Silver put options purchased [Member] | 2013 [Member] |  |  |  |  |
Derivative instruments Settlement |  |  |  |  |
Weighted Average Strike Price of Put Options | $ / XAG |  |  |  |  | 18.00

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