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Fair Value Measurements Fair Value Measurements (Details Textual) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Convertible Senior Notes Due March 2028 [Member] | Dec. 31, 2012 Convertible Senior Notes Due March 2028 [Member] | Dec. 31, 2013 Senior Notes due 2021 [Member] | Jan. 29, 2013 Senior Notes due 2021 [Member] | Dec. 31, 2013 Palmarejo [Member] | Dec. 31, 2013 Rochester [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Expected Royalty Duration, Rochester |  |  |  |  |  |  |  | 2 years 6 months | 5 years 1 month 6 days |  |
Liabilities, Fair Value Disclosure | $ 63,558 | $ 154,397 |  |  |  |  |  |  |  | $ 61,968 | $ 0
Impairment of Long-Lived Assets Held-for-use | $ 772,993 | $ 5,825 | $ 0 |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 3.25% | 3.25% | 7.875% | 7.875% |  |  |  |

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