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Debt (Details) (USD $) | 3 Months Ended | 12 Months Ended |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 oz | Dec. 31, 2013 oz | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 3.25% Convertible Senior Notes due March 2028 [Member] | Dec. 31, 2012 3.25% Convertible Senior Notes due March 2028 [Member] | Dec. 31, 2011 3.25% Convertible Senior Notes due March 2028 [Member] | Feb. 12, 2013 3.25% Convertible Senior Notes due March 2028 [Member] | Dec. 31, 2013 Senior Notes due 2021 [Member] | Dec. 31, 2012 Senior Notes due 2021 [Member] | Dec. 31, 2011 Senior Notes due 2021 [Member] | Dec. 31, 2013 1.25% Convertible Senior Notes due January 2024 (terminated in 2011) [Member] | Dec. 31, 2012 1.25% Convertible Senior Notes due January 2024 (terminated in 2011) [Member] | Dec. 31, 2011 1.25% Convertible Senior Notes due January 2024 (terminated in 2011) [Member] | Dec. 31, 2013 Senior Term Notes due December 31, 2012 [Member] | Dec. 31, 2012 Senior Term Notes due December 31, 2012 [Member] | Dec. 31, 2011 Senior Term Notes due December 31, 2012 [Member] | Dec. 31, 2013 Kensington Term Facility [Member] | Dec. 31, 2012 Kensington Term Facility [Member] | Dec. 31, 2011 Kensington Term Facility [Member] | Dec. 31, 2013 Capital Lease Obligations [Member] | Dec. 31, 2012 Capital Lease Obligations [Member] | Dec. 31, 2011 Capital Lease Obligations [Member] | Dec. 31, 2013 Other debt obligations [Member] | Dec. 31, 2012 Other debt obligations [Member] | Dec. 31, 2011 Other debt obligations [Member] | Dec. 31, 2012 Call Option [Member] Kensington Term Facility [Member] oz | Dec. 31, 2013 Palmarejo gold production royalty [Member] oz | Dec. 31, 2013 Maximum [Member] Rate | Dec. 31, 2013 Maximum [Member] Palmarejo gold production royalty [Member] oz
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ratio of Adjusted Earnings Before Interest Taxes Depreciation and Amortization to Interest Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00 |
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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Average Gold Price in Excess of Minimum Contractual Deduction Rate | $ 400 | $ 400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gold under collars protection |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 243,750 |  |  |
Long term debt and capital lease obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current | 2,505,000 | 2,505,000 | 55,983,000 |  | 0 | 48,081,000 |  | 48,700,000 | 0 | 0 |  |  |  |  |  |  |  |  |  |  | 2,505,000 | 7,902,000 |  |  |  |  |  |  |  |
Non-current | 306,130,000 | 306,130,000 | 3,460,000 |  | 5,334,000 | 0 |  |  | 300,000,000 | 0 |  |  |  |  |  |  |  |  |  |  | 796,000 | 3,460,000 |  |  |  |  |  |  |  |
Interest expenses incurred for various debt instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Expense |  |  |  |  | 466,000 | 1,581,000 | 1,581,000 |  | 21,853,000 | 0 | 0 | 0 | 0 | 1,000 | 0 | 0 | 1,381,000 | 0 | 2,339,000 | 4,383,000 | 415,000 | 997,000 | 1,620,000 | 291,000 | 881,000 | 1,379,000 |  |  |  |
Line of Credit Facility, Commitment Fee Amount | 612,000 |  | 213,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion of Franco Nevada royalty obligation |  | 17,641,000 | 19,139,000 | 22,230,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of debt issuance costs |  | 2,143,000 | 1,146,000 | 2,050,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion of debt discount |  | 576,000 | 2,536,000 | 2,324,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized interest |  | (2,694,000) | (2,663,000) | (2,175,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total interest expense, net of capitalized interest |  | $ 41,303,000 | $ 26,169,000 | $ 34,774,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of Royalty on Ounces of Gold | 259,069 | 259,069 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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