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Derivative Financial Instruments (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) oz $ / oz | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2016 USD ($) oz $ / oz
Derivative [Line Items] |  |  |  |
Gain (loss) on derivative instruments | $ (11,581,000) | $ 5,202,000 | $ 3,618,000 |
Derivative instruments Settlement |  |  |  |
Price per ounce under agreement | 416 |  |  |
Silver concentrate sales agreements [Member] | 2016 [Member] |  |  |  |
Derivative instruments Settlement |  |  |  |
Derivative, notional amount | $ 5,801,000 |  |  |
Derivative average price | $ / oz | 16.35 |  |  |
Outstanding Provisionally Priced Sales Consists of Silver | oz | 354,771 |  |  |
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 | $ 30,810,000 |  |  |
Derivative average price | $ / oz | 1,208 |  |  |
Outstanding Provisionally Priced Sales Consists of Gold | oz | 25,505 |  |  |
Gold concentrates sales agreements [Member] | Thereafter [Member] |  |  |  |
Derivative instruments Settlement |  |  |  |
Derivative, notional amount |  |  |  | $ 0
Derivative average price | $ / oz |  |  |  | 0
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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