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Income and Mining Taxes - Narrative (Details) $ in Millions | 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
Income Tax Contingency [Line Items] |  |  |  |  |  |
Valuation allowance |  |  |  | $ 40.8 |  |
Gross unrecognized benefits |  |  | 4.3 | 5.1 | 1.2 |
Income tax penalties and interest expense |  |  | $ 4.8 | $ 5.5 | $ 0.7 |
Minimum |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Unrecognized income tax liability |  |  | 1.5 |  |  |
Maximum |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Unrecognized income tax liability |  |  | $ 2.5 |  |  |
Palmarejo gold production royalty |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Payment made for gold on the end of royalty obligation | oz |  |  |  |  |  | 4,167
Silver and gold options |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Net derivative gain (loss) |  |  |  | $ 1.6 | $ 1.3 |
Franco-Nevada warrant |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Market-to-market adjustment | $ 5.9 | $ 17.0 |  |  |  |

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