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Debt (Details Textual) (USD $) | 0 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |  |  |  |  | 9 Months Ended | 0 Months Ended
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May 27, 2014 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2014 Convertible Senior Notes Due March 2028 [Member] | Dec. 31, 2013 Convertible Senior Notes Due March 2028 [Member] | Sep. 30, 2014 Senior Notes due Two Thousand Twenty One [Member] | Mar. 12, 2014 Senior Notes due Two Thousand Twenty One [Member] | Dec. 31, 2013 Senior Notes due Two Thousand Twenty One [Member] | Jan. 29, 2013 Senior Notes due Two Thousand Twenty One [Member] | Sep. 30, 2014 Banco Bisa Line of Credit [Member] | Sep. 30, 2014 Banco de Credito Line of Credit [Member] | Sep. 30, 2014 Palmarejo gold production royalty [Member] | Sep. 30, 2014 Palmarejo gold production royalty [Member] oz | Sep. 30, 2014 Palmarejo gold production royalty [Member] Maximum [Member] oz | Sep. 30, 2014 3.25% Convertible Senior Notes due March 2028 [Member] | Dec. 31, 2013 3.25% Convertible Senior Notes due March 2028 [Member] | Feb. 12, 2013 3.25% Convertible Senior Notes due March 2028 [Member] | Sep. 30, 2014 Palmarejo [Member] | Oct. 02, 2014 Subsequent Event [Member]
Debt and capital lease obligations (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  |  | $ 12,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  | 437,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes |  |  |  |  |  |  | 3.25% | 3.25% | 7.875% |  | 7.875% | 7.875% |  |  |  |  |  | 3.25% |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | 0 | 5,334,000 | 450,000,000 | 150,000,000 |  | 300,000,000 |  |  |  |  |  | 5,334,000 |  |  |  |
Debt |  | 11,733,000 |  | 11,733,000 |  | 2,505,000 |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 48,700,000 |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 43,300,000 |  |  |  |
Interest Expense, Debt |  | 0 | 18,000 | 0 | 287,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion of debt discount |  | (107,000) | 0 | (252,000) | 576,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate on the notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.50% |  |  |  |  |  |  |
Borrowing under term facility |  | 100,000,000 |  | 100,000,000 |  |  |  |  |  |  |  |  | 7,000,000 | 4,000,000 |  |  |  |  |  |  |  |
Line of credit facility, increase, additional borrowings |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write off revolver costs, interest expense |  | 0 |  | 3,035,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, commitment fee amount |  | 0 | 176,000 | 179,000 | 434,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Interest Rate at Period End |  |  |  |  |  |  |  |  |  |  |  |  | 2.75% | 3.00% |  |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding |  | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on termination of revolving credit facility |  | 0 | 0 | 3,035,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty Guarantees, Commitments, Ounces of Gold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 302,584 | 400,000 |  |  |  |  |
Percentage of Actual Gold Production |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Further Payment Made on Number of Additional Ounces of Gold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 97,416 |  |  |  |  |  |
Termination payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000.0
Production to be sold, percent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00%
Sale of production, price per ounce of gold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 800
Aggregate deposit to be received |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,000,000.0
Payments to Acquire Royalty Interests in Mining Properties | 2,200,000 | 11,351,000 | 12,619,000 | 38,379,000 | 43,548,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected Royalty Duration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.7 |
Additional Long term debt and capital lease obligations(Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Implicit Interest Rate |  | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion of Royalty Obligation |  | 2,545,000 | 4,023,000 | 8,639,000 | 12,192,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining Minimum Obligation Under Royalty Agreements |  | 38,100,000 |  | 38,100,000 |  | 51,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expensed Interest |  | 11,616,000 | 9,662,000 | 36,980,000 | 30,324,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized interest |  | (423,000) | (1,133,000) | (942,000) | (1,494,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Carrying Amount of Equity Component |  |  |  |  |  |  | $ 10,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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