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Debt (Details) (USD $) | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Jun. 30, 2014 oz | Jun. 30, 2013 | Jun. 30, 2014 oz | Jun. 30, 2013 | Dec. 31, 2013 | Jun. 30, 2014 3.25% Convertible Senior Notes due March 2028 [Member] | Dec. 31, 2013 3.25% Convertible Senior Notes due March 2028 [Member] | Jun. 30, 2014 Senior Notes due 2021 [Member] | Mar. 12, 2014 Senior Notes due 2021 [Member] | Dec. 31, 2013 Senior Notes due 2021 [Member] | Jan. 29, 2013 Senior Notes due 2021 [Member] | Jun. 30, 2014 Palmarejo gold production royalty [Member] | Jun. 30, 2014 Capital Lease Obligations [Member] | Dec. 31, 2013 Capital Lease Obligations [Member] | Jun. 30, 2014 Palmarejo gold production royalty [Member] oz | Jun. 30, 2014 Maximum [Member] Palmarejo gold production royalty [Member] oz | Jun. 30, 2014 Convertible Senior Notes Due March 2028 [Member] | Dec. 31, 2013 Convertible Senior Notes Due March 2028 [Member] | Feb. 12, 2013 Convertible Senior Notes Due March 2028 [Member] | Jun. 30, 2014 Senior Notes due Two Thousand Twenty One [Member] | Dec. 31, 2013 Senior Notes due Two Thousand Twenty One [Member] | Jun. 30, 2014 Capital Lease Obligations [Member] | Dec. 31, 2013 Capital Lease Obligations [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Carrying Amount of Equity Component |  |  |  |  |  | $ 10,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  |  |  |  |  | 30.50% |  |  |  |  |  |  |  |  |  |  |
Royalty Guarantees, Commitments, Ounces of Gold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400,000 |  |  |  |  |  |  |
Minimum Obligation Paid in Monthly Payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,167 |  |  |  |  |  |  |  |
Annual Inflation Compounding Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |
Percentage of Actual Gold Production | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt and capital lease obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current | 11,565,000 |  | 11,565,000 |  | 2,505,000 |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 48,700,000 | 0 | 0 | 6,231,000 | 2,505,000
Debt Instrument, Face Amount |  |  |  |  |  | 0 | 5,334,000 | 450,000,000 | 150,000,000 |  | 300,000,000 |  |  |  |  |  | 5,334,000 |  |  |  |  |  |
Non-current | 468,570,000 |  | 468,570,000 |  | 306,130,000 |  |  | 452,855,000 |  | 300,000,000 |  |  | 15,715,000 | 796,000 |  |  |  |  |  |  |  |  |
Payment of Royalty on Ounces of Gold | 289,760 |  | 289,760 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base Average Gold Price in Excess of Minimum Contractual Deduction Rate | 400 |  | 400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expenses incurred for various debt instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Paid on Senior Notes due 2021 | 8,859,000 | 5,906,000 | 15,323,000 | 10,041,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Paid on Convertible Notes due 2028 | 43,000 | 43,000 | 86,000 | 380,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Amount | 0 | 133,000 | 179,000 | 258,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write off revolver costs, interest expense | 0 |  | 3,035,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Paid on Capital Leases | 333,000 | 98,000 | 392,000 | 266,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Expense | 0 | 72,000 | 0 | 268,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion of Franco Nevada royalty obligation | 2,898,000 | 4,107,000 | 6,094,000 | 8,170,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of debt issuance costs | 420,000 | 539,000 | 918,000 | 1,064,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion of debt discount | (108,000) | 0 | (144,000) | 576,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized interest | (135,000) | 32,000 | (518,000) | (361,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total interest expense, net of capitalized interest | $ 12,310,000 | $ 10,930,000 | $ 25,365,000 | $ 20,662,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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