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Debt (Details Textual) |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2016 USD ($) oz | Sep. 09, 2016 shares | Jul. 25, 2016 USD ($) | Jul. 15, 2016 USD ($) | Jun. 23, 2015 USD ($) | Oct. 02, 2014 USD ($) | Sep. 30, 2016 USD ($) Agreements oz shares | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) debt oz | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) | Mar. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of Agreements | Agreements |  |  |  |  |  |  | 2 |  |  |  |  |
Debt and capital lease obligations (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | shares |  | 4,293,785 |  |  |  |  | 9,253,016 |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  | $ 10,040,000 | $ 0 | $ 10,040,000 | $ 524,000 |  |
Percentage of Actual Gold Production |  |  |  |  |  |  |  |  | 50.00% |  |  |
Price per ounce under agreement | $ 416 |  |  |  |  |  | 416 |  | $ 416 |  |  |
Cash payments on gold production royalty |  |  |  |  |  |  | 7,563,000 | 10,159,000 | 27,155,000 | 30,281,000 |  |
Additional Long term debt and capital lease obligations(Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Accretion of Royalty Obligation |  |  |  |  |  |  | 49,000 | $ 1,642,000 | $ 1,211,000 | $ 5,444,000 |  |
Convertible Senior Notes Due March 2028 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt and capital lease obligations (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  | $ 712,000 |
Banco de Credito Line of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt and capital lease obligations (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Number of lines of credits, outstanding | debt |  |  |  |  |  |  |  |  | 2 |  |  |
Borrowing under term facility | $ 27,000,000 |  |  |  |  |  | $ 27,000,000 |  | $ 27,000,000 |  |  |
Palmarejo gold stream agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt and capital lease obligations (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Termination payment |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  |
Price per ounce under agreement |  |  |  |  |  | $ 800 |  |  |  |  |  |
Palmarejo gold production royalty [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt and capital lease obligations (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Payment made for gold on the end of royalty obligation | oz | 4,167 |  |  |  |  |  | 4,167 |  | 4,167 |  |  |
Royalty Obligation, Term | 8 years |  |  |  |  |  |  |  |  |  |  |
Annual Inflation Compounding Adjustment | 1.00% |  |  |  |  |  | 1.00% |  | 1.00% |  |  |
Palmarejo gold production royalty [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt and capital lease obligations (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Payable ounces under royalty obligation | oz | 400,000 |  |  |  |  |  | 400,000 |  | 400,000 |  |  |
Senior Notes due 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt and capital lease obligations (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt | $ 10,800,000 |  |  |  |  |  | $ 10,800,000 |  | $ 10,800,000 |  |  |
Stock Issued During Period, Shares, New Issues | shares |  |  |  |  |  |  | 700,000 |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  | $ 1,200,000 |  |  |  |  |
Convertible Senior Notes Due March 2028 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt and capital lease obligations (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Convertible Debt |  |  | $ 700,000 |  |  |  |  |  |  |  |  |
Senior Notes due 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount (Premium), Net | 4,400,000 |  |  |  |  |  | 4,400,000 |  | $ 4,400,000 |  | 5,300,000 |
Debt and capital lease obligations (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Redemption period, low range |  |  |  |  |  |  |  |  | 30 days |  |  |
Redemption period, upper range |  |  |  |  |  |  |  |  | 60 days |  |  |
Redemption price after initial redemption period (as a percent) |  |  |  |  |  |  |  |  | 100.00% |  |  |
Short Term Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unamortized debt issuance expense |  |  |  |  |  |  |  |  |  |  | $ 5,000,000 |
Debt and capital lease obligations (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000.0
Term Loan due 2020 [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt and capital lease obligations (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  |  |  | 5 years |  |  |  |  |  |  |
Long-term Debt |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |
Repayments of Debt |  |  |  | $ 99,000,000 |  |  |  |  |  |  |  |
Payments of Debt Extinguishment Costs |  |  |  | 4,400,000 |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  | 103,400,000 |  |  |  |  |  |  |  |
Reported Value Measurement [Member] | Convertible Senior Notes Due March 2028 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt and capital lease obligations (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 0 |  |  |  |  |  | $ 0 |  | $ 0 |  |  |
Other Nonoperating Income (Expense) [Member] | Term Loan due 2020 [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt and capital lease obligations (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | $ 8,800,000 |  |  |  |  |  |  |  |

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