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Derivative Financial Instruments (Details) | 3 Months Ended
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Mar. 31, 2016 USD ($) oz $ / oz | Mar. 31, 2015 USD ($)
Derivative [Line Items] |  |
Remaining ounces under royalty obligation | oz | 20,994 |
Gain (loss) on derivative instruments | $ (8,695,000) | $ (4,884,000)
Derivative instruments Settlement |  |
Price per ounce under agreement | 416 |
Palmarejo gold production royalty [Member] | 2016 [Member] |  |
Derivative instruments Settlement |  |
Derivative, notional amount | 17,240,000 |
Price per ounce under agreement | $ 821 |
Notional ounces | oz | 20,994 |
Palmarejo gold production royalty [Member] | Thereafter [Member] |  |
Derivative instruments Settlement |  |
Derivative, notional amount | $ 0 |
Price per ounce under agreement | $ 0 |
Notional ounces | oz | 0 |
Silver concentrate sales agreements [Member] | 2016 [Member] |  |
Derivative instruments Settlement |  |
Derivative, notional amount | $ 6,736,000 |
Derivative average price | $ / oz | 15.36 |
Outstanding Provisionally Priced Sales Consists of Silver | oz | 438,573 |
Silver concentrate sales agreements [Member] | Thereafter [Member] |  |
Derivative instruments Settlement |  |
Derivative, notional amount | $ 0 |
Derivative average price | $ / oz | 0 |
Notional ounces | oz | 0 |
Gold concentrates sales agreements [Member] | 2016 [Member] |  |
Derivative instruments Settlement |  |
Derivative, notional amount | $ 45,868,000 |
Derivative average price | $ / oz | 1,183 |
Outstanding Provisionally Priced Sales Consists of Gold | oz | 38,773 |
Gold concentrates sales agreements [Member] | Thereafter [Member] |  |
Derivative instruments Settlement |  |
Derivative, notional amount | $ 0 |
Derivative average price | $ / oz | 0 |
Notional ounces | oz | 0 |
Silver put options purchased [Member] | 2016 [Member] |  |
Derivative instruments Settlement |  |
Derivative, notional amount | $ 4,500,000 |
Derivative, Weighted Average Strike Price of Put Options | $ / oz | 15.00 |
Silver put options purchased [Member] | Thereafter [Member] |  |
Derivative instruments Settlement |  |
Derivative, notional amount | $ 0 |
Derivative, Weighted Average Strike Price of Put Options | $ / oz | 0.00 |
Notional ounces | oz | 0 |
Silver Put Options Sold [Member] | 2016 [Member] |  |
Derivative instruments Settlement |  |
Derivative, notional amount | $ 4,200,000 |
Derivative, Weighted Average Strike Price of Put Options | $ / oz | 14.00 |
Notional ounces | oz | 300,000 |
Silver Put Options Sold [Member] | Thereafter [Member] |  |
Derivative instruments Settlement |  |
Derivative, notional amount | $ 0 |
Derivative, Weighted Average Strike Price of Put Options | $ / oz | 0.00 |
Notional ounces | oz | 0 |

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5618551-113959 + Details
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