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Debt (Details Textual) |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Jun. 23, 2015 USD ($) | Mar. 31, 2015 USD ($) | Mar. 31, 2016 USD ($) debt oz | Mar. 31, 2015 USD ($) | Dec. 31, 2015 USD ($)
Debt and capital lease obligations (Textual) [Abstract] |  |  |  |  |
Number of lines of credits, outstanding | debt |  |  | 2 |  |
Percentage of Actual Gold Production |  |  | 50.00% |  |
Price per ounce under agreement |  |  | $ 416 |  |
Cash payments on gold production royalty |  |  | $ 9,131,000 | $ 10,368,000 |
Debt Instrument, Commodity Royalty Payments | oz |  |  | 379,006 |  |
Remaining ounces under royalty obligation | oz |  |  | 20,994 |  |
Additional Long term debt and capital lease obligations(Textual) [Abstract] |  |  |  |  |
Accretion of Royalty Obligation |  |  | $ 765,000 | 2,031,000 |
Remaining Minimum Obligation Under Royalty Agreements |  |  | 9,800,000 |  | $ 15,200,000
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] |  |  |  |  |
Borrowing under term facility |  |  | $ 27,000,000 |  |
Palmarejo gold production royalty [Member] |  |  |  |  |
Debt and capital lease obligations (Textual) [Abstract] |  |  |  |  |
Effective interest rate on the notes |  |  | 30.50% |  |
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 |  |
Annual Inflation Compounding Adjustment |  |  | 1.00% |  |
Palmarejo gold production royalty [Member] | Maximum [Member] |  |  |  |  |
Debt and capital lease obligations (Textual) [Abstract] |  |  |  |  |
Payable ounces under royalty obligation | oz |  |  | 400,000 |  |
Convertible Senior Notes Due March 2028 [Member] |  |  |  |  |
Debt and capital lease obligations (Textual) [Abstract] |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  | $ 4,600,000 |  | 4,600,000 |
Senior Notes due 2021 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Unamortized Discount (Premium), Net |  |  | $ 5,100,000 |  | 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 |  |  | $ 4,700,000 |  | $ 5,000,000
Debt and capital lease obligations (Textual) [Abstract] |  |  |  |  |
Short-term Debt |  | $ 50,000,000.0 |  | $ 50,000,000.0 |
Term Loan due 2020 [Member] | Secured Debt [Member] |  |  |  |  |
Debt and capital lease obligations (Textual) [Abstract] |  |  |  |  |
Long-term Debt | $ 100,000,000 |  |  |  |
Prepayment premium for payments between first and second anniversary (as a percent) | 105.00% |  |  |  |
Prepayment premium for payments after second anniversary (as a percent) | 103.00% |  |  |  |
Amortization payments (as a percent) | 1.00% |  |  |  |
Debt Instrument, Annual Principal Payment |  |  | 800,000 |  |
Eurodollar [Member] | Short Term Credit Agreement [Member] |  |  |  |  |
Debt and capital lease obligations (Textual) [Abstract] |  |  |  |  |
Basis spread on variable rate (as a percent) |  | 2.50% |  |  |
Eurodollar [Member] | Term Loan due 2020 [Member] | Secured Debt [Member] |  |  |  |  |
Debt and capital lease obligations (Textual) [Abstract] |  |  |  |  |
Basis spread on variable rate (as a percent) | 1.00% |  |  |  |
Adjusted Eurodollar [Member] | Term Loan due 2020 [Member] | Secured Debt [Member] |  |  |  |  |
Debt and capital lease obligations (Textual) [Abstract] |  |  |  |  |
Basis spread on variable rate (as a percent) | 8.00% |  |  |  |
Reported Value Measurement [Member] | Convertible Senior Notes Due March 2028 [Member] |  |  |  |  |
Debt and capital lease obligations (Textual) [Abstract] |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 712,000 |  |

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