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Derivative Financial Instruments - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2016 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Jan. 21, 2009 oz
Palmarejo gold production royalty |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Production to be sold, percent |  |  |  |  |  | 50.00%
Payment made for gold on the end of royalty obligation | oz |  |  |  |  |  | 4,167
Palmarejo gold production royalty | Maximum |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Payable ounces under royalty obligation | oz |  |  |  |  |  | 400,000
Franco-Nevada warrant |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Market-to-market adjustment | $ 5,900 | $ 17,000 |  |  |  |
Realized losses | $ 10,800 | $ 13,900 |  |  |  |
Concentrate Sales Contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Provisional gain (loss) on derivatives and commodity contracts |  |  | $ 631 | $ (239) | $ 214 |
Silver and gold options |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Net derivative gain (loss) |  |  |  | $ 1,600 | $ 1,300 |

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + 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=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition Amount of decrease in the fair value of derivatives recognized in the income statement. + 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=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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