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Debt (Details Textual) (USD $) | 3 Months Ended |  |  |  |  |  |  |  |  | 3 Months Ended |  |  |
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Mar. 31, 2014 oz | Mar. 31, 2013 | Dec. 31, 2013 | Jan. 21, 2009 | Mar. 31, 2014 Convertible Senior Notes Due March 2028 [Member] | Dec. 31, 2013 Convertible Senior Notes Due March 2028 [Member] | Mar. 31, 2014 Senior Notes due Two Thousand Twenty One [Member] | Mar. 12, 2014 Senior Notes due Two Thousand Twenty One [Member] | Jan. 29, 2013 Senior Notes due Two Thousand Twenty One [Member] | Mar. 31, 2014 Banco Bisa Line of Credit [Member] | Mar. 31, 2014 Banco de Credito Line of Credit [Member] | Mar. 31, 2014 Palmarejo gold production royalty [Member] | Mar. 31, 2014 Palmarejo gold production royalty [Member] oz | Mar. 31, 2013 Palmarejo gold production royalty [Member] | Mar. 31, 2014 Palmarejo gold production royalty [Member] Maximum [Member] oz | Mar. 31, 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]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ore on leach pads | $ 59,895,000 |  | $ 50,495,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and capital lease obligations (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes |  |  |  |  | 3.25% | 3.25% | 7.875% |  | 7.875% |  |  |  |  |  |  | 3.25% |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | 450,000,000 | 150,000,000 | 300,000,000 |  |  |  |  |  |  | 0 | 5,334,000 |
Debt | 8,095,000 |  | 2,505,000 |  |  |  |  |  |  |  |  |  |  |  |  | 5,334,000 | 0 | 48,700,000
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 43,300,000 |  |
Interest Expense, Debt | 0 | 197,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion of debt discount | (36,000) | 577,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate on the notes |  |  |  |  |  |  |  |  |  |  |  | 30.00% |  |  |  |  |  |
Borrowing under term facility | 100,000,000 |  |  |  |  |  |  |  |  | 7,000,000 | 4,000,000 |  |  |  |  |  |  |
Line of credit facility, increase, additional borrowings | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, commitment fee amount | 179,000 | 125,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Interest Rate at Period End |  |  |  |  |  |  |  |  |  | 3.00% | 3.00% |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on termination of revolving credit facility | 3,035,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty Expense |  |  |  |  |  |  |  |  |  |  |  |  | 14,700,000 | 15,400,000 |  |  |  |
Sale Portion Life of Mine |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty Guarantees, Commitments, Ounces of Gold |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400,000 |  |  |
Royalty agreement minimum obligation for the period | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty Agreement Minimum Obligation for Per Month | 4,167 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty Agreement Period |  |  |  | 8 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Actual Gold Production | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base Average Gold Price in Excess of Minimum Contractual Deduction Rate | 400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of Royalty on Ounces of Gold | 275,898 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Further Payment Made on Number of Additional Ounces of Gold |  |  |  |  |  |  |  |  |  |  |  |  | 124,103 |  |  |  |  |
Payments to Acquire Royalty Interests in Mining Properties | 14,683,000 | 15,448,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional Long term debt and capital lease obligations(Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Implicit Interest Rate | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion of Royalty Obligation | 3,196,000 | 4,062,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining Minimum Obligation Under Royalty Agreements | 46,000,000 |  | 51,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expensed Interest | 13,054,000 | 9,732,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized interest | (384,000) | (393,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Carrying Amount of Equity Component |  |  |  |  | $ 10,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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