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Derivative Financial Instruments (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 USD ($) oz $ / oz | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) oz $ / oz | Jun. 30, 2015 USD ($)
Derivative [Line Items] |  |  |  |
Gain (loss) on derivative instruments | $ (3,579,000) | $ 2,754,000 | $ (12,274,000) | $ (2,130,000)
Derivative instruments Settlement |  |  |  |
Price per ounce under agreement | 416 |  | 416 |
Palmarejo gold production royalty [Member] | 2016 [Member] |  |  |  |
Derivative instruments Settlement |  |  |  |
Derivative, notional amount | 7,487,000 |  | 7,487,000 |
Price per ounce under agreement | $ 882 |  | $ 882 |
Notional ounces | oz | 8,493 |  | 8,493 |
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] | 2016 [Member] |  |  |  |
Derivative instruments Settlement |  |  |  |
Derivative, notional amount | $ 10,016,000 |  | $ 10,016,000 |
Derivative average price | $ / oz | 18.28 |  | 18.28 |
Outstanding Provisionally Priced Sales Consists of Silver | oz | 547,940 |  | 547,940 |
Silver concentrate sales agreements [Member] | Thereafter [Member] |  |  |  |
Derivative instruments Settlement |  |  |  |
Derivative, notional amount | $ 0 |  | $ 0 |
Derivative average price | $ / oz | 0 |  | 0 |
Notional ounces | oz | 0 |  | 0 |
Gold concentrates sales agreements [Member] | 2016 [Member] |  |  |  |
Derivative instruments Settlement |  |  |  |
Derivative, notional amount | $ 43,839,000 |  | $ 43,839,000 |
Derivative average price | $ / oz | 1,257 |  | 1,257 |
Outstanding Provisionally Priced Sales Consists of Gold | oz | 34,876 |  | 34,876 |
Gold concentrates sales agreements [Member] | Thereafter [Member] |  |  |  |
Derivative instruments Settlement |  |  |  |
Derivative, notional amount | $ 0 |  | $ 0 |
Derivative average price | $ / oz | 0 |  | 0 |
Notional ounces | oz | 0 |  | 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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