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Debt (Details Textual) (USD $) | 0 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |  |  |  |  | 6 Months Ended
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May 27, 2014 | Jun. 30, 2014 oz | Jun. 30, 2013 | Jun. 30, 2014 oz | Jun. 30, 2013 | Dec. 31, 2013 | Jun. 30, 2014 Convertible Senior Notes Due March 2028 [Member] | Dec. 31, 2013 Convertible Senior Notes Due March 2028 [Member] | Jun. 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] | Jun. 30, 2014 Banco Bisa Line of Credit [Member] | Jun. 30, 2014 Banco de Credito Line of Credit [Member] | Jun. 30, 2014 Palmarejo gold production royalty [Member] | Jun. 30, 2014 Palmarejo gold production royalty [Member] oz | Jun. 30, 2014 Palmarejo gold production royalty [Member] Maximum [Member] oz | Jun. 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] | Jun. 30, 2014 Palmarejo [Member]
Debt and capital lease obligations (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  | 11,565,000 |  | 11,565,000 |  | 2,505,000 |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 48,700,000 |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 43,300,000 |  |  |
Interest Expense, Debt |  | 0 | 72,000 | 0 | 268,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion of debt discount |  | (108,000) | 0 | (144,000) | 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 | 133,000 | 179,000 | 258,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400,000 |  |  |  |
Percentage of Actual Gold Production |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base Average Gold Price in Excess of Minimum Contractual Deduction Rate |  | 400 |  | 400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of Royalty on Ounces of Gold |  | 289,760 |  | 289,760 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Further Payment Made on Number of Additional Ounces of Gold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 110,240 |  |  |  |  |
Payments to Acquire Royalty Interests in Mining Properties | 2,200,000 | 12,345,000 | 15,480,000 | 27,028,000 | 30,929,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected Royalty Duration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.0
Additional Long term debt and capital lease obligations(Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Implicit Interest Rate |  | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion of Royalty Obligation |  | 2,898,000 | 4,107,000 | 6,094,000 | 8,170,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining Minimum Obligation Under Royalty Agreements |  | 42,000,000 |  | 42,000,000 |  | 51,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expensed Interest |  | 12,310,000 | 10,930,000 | 25,365,000 | 20,662,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized interest |  | (135,000) | 32,000 | (518,000) | (361,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Carrying Amount of Equity Component |  |  |  |  |  |  | $ 10,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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