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Fair Value Measurements (Details 1) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013 | Jan. 29, 2013
--- | --- | --- | ---
Assets: |  |  |
Total assets | $ 62,941 | $ 14,656 |
Liabilities: |  |  |
Total liabilities | 67,907 | 63,559 |
Royalty obligation embedded derivative [Member] |  |  |
Liabilities: |  |  |
Derivative fair value of derivative liability |  | 40,338 |
Rochester Royalty Obligation [Member] |  |  |
Liabilities: |  |  |
Derivative fair value of derivative liability |  | 21,630 |
Other Derivative Instrument [Member] |  |  |
Assets: |  |  |
Fair value of derivative asset | 240 |  |
Liabilities: |  |  |
Derivative fair value of derivative liability |  | 1,591 |
Gold Put Purchase and Call Sold Options Net [Member] |  |  |
Assets: |  |  |
Fair value of derivative asset | 1,298 |  |
Liabilities: |  |  |
Derivative fair value of derivative liability | 291 |  |
Short-term Deposit [Member] |  |  |
Assets: |  |  |
Short-term Deposits | 47,642 | 14,521 |
Marketable securities [Member] |  |  |
Assets: |  |  |
Restricted certificates of deposits | 13,761 | 135 |
Fair Value, Inputs, Level 1 [Member] |  |  |
Assets: |  |  |
Total assets | 61,403 | 14,521 |
Liabilities: |  |  |
Total liabilities | 0 | 0 |
Fair Value, Inputs, Level 1 [Member] | Royalty obligation embedded derivative [Member] |  |  |
Liabilities: |  |  |
Derivative fair value of derivative liability | 0 | 0 |
Fair Value, Inputs, Level 1 [Member] | Royalty Obligation [Member] |  |  |
Liabilities: |  |  |
Derivative fair value of derivative liability | 0 |  |
Fair Value, Inputs, Level 1 [Member] | Rochester Royalty Obligation [Member] |  |  |
Liabilities: |  |  |
Derivative fair value of derivative liability |  | 0 |
Fair Value, Inputs, Level 1 [Member] | Other Derivative Instrument [Member] |  |  |
Assets: |  |  |
Fair value of derivative asset | 0 |  |
Liabilities: |  |  |
Derivative fair value of derivative liability |  | 0 |
Fair Value, Inputs, Level 1 [Member] | Gold Put Purchase and Call Sold Options Net [Member] |  |  |
Assets: |  |  |
Fair value of derivative asset | 0 |  |
Liabilities: |  |  |
Derivative fair value of derivative liability | 0 |  |
Fair Value, Inputs, Level 1 [Member] | Short-term Deposit [Member] |  |  |
Assets: |  |  |
Short-term Deposits | 47,642 | 14,521 |
Fair Value, Inputs, Level 1 [Member] | Marketable securities [Member] |  |  |
Assets: |  |  |
Restricted certificates of deposits | 13,761 | 0 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Assets: |  |  |
Total assets | 1,538 | 135 |
Liabilities: |  |  |
Total liabilities | 291 | 1,591 |
Fair Value, Inputs, Level 2 [Member] | Royalty obligation embedded derivative [Member] |  |  |
Liabilities: |  |  |
Derivative fair value of derivative liability | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Royalty Obligation [Member] |  |  |
Liabilities: |  |  |
Derivative fair value of derivative liability | 0 |  |
Fair Value, Inputs, Level 2 [Member] | Rochester Royalty Obligation [Member] |  |  |
Liabilities: |  |  |
Derivative fair value of derivative liability |  | 0 |
Fair Value, Inputs, Level 2 [Member] | Other Derivative Instrument [Member] |  |  |
Assets: |  |  |
Fair value of derivative asset | 240 |  |
Liabilities: |  |  |
Derivative fair value of derivative liability |  | 1,591 |
Fair Value, Inputs, Level 2 [Member] | Gold Put Purchase and Call Sold Options Net [Member] |  |  |
Liabilities: |  |  |
Derivative fair value of derivative liability | 291 |  |
Fair Value, Inputs, Level 2 [Member] | Short-term Deposit [Member] |  |  |
Assets: |  |  |
Short-term Deposits | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Marketable securities [Member] |  |  |
Assets: |  |  |
Restricted certificates of deposits | 0 | 135 |
Fair Value, Inputs, Level 3 [Member] |  |  |
Assets: |  |  |
Total assets | 0 | 0 |
Liabilities: |  |  |
Total liabilities | 67,616 | 61,968 |
Fair Value, Inputs, Level 3 [Member] | Royalty obligation embedded derivative [Member] |  |  |
Liabilities: |  |  |
Derivative fair value of derivative liability | 43,960 | 40,338 |
Fair Value, Inputs, Level 3 [Member] | Royalty Obligation [Member] |  |  |
Liabilities: |  |  |
Derivative fair value of derivative liability | 23,656 |  |
Fair Value, Inputs, Level 3 [Member] | Rochester Royalty Obligation [Member] |  |  |
Liabilities: |  |  |
Derivative fair value of derivative liability |  | 21,630 |
Fair Value, Inputs, Level 3 [Member] | Other Derivative Instrument [Member] |  |  |
Assets: |  |  |
Fair value of derivative asset | 0 |  |
Liabilities: |  |  |
Derivative fair value of derivative liability |  | 0 |
Fair Value, Inputs, Level 3 [Member] | Gold Put Purchase and Call Sold Options Net [Member] |  |  |
Assets: |  |  |
Fair value of derivative asset | 0 |  |
Liabilities: |  |  |
Derivative fair value of derivative liability | 0 |  |
Fair Value, Inputs, Level 3 [Member] | Short-term Deposit [Member] |  |  |
Assets: |  |  |
Short-term Deposits | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Marketable securities [Member] |  |  |
Assets: |  |  |
Restricted certificates of deposits | 0 | 0 |
Prepaid Expenses and Other Current Assets [Member] |  |  |
Assets: |  |  |
Fair value of derivative asset | 1,539 | 184 |
Prepaid Expenses and Other Current Assets [Member] | Palmarejo gold production royalty [Member] |  |  |
Assets: |  |  |
Fair value of derivative asset |  |  |
Prepaid Expenses and Other Current Assets [Member] | Gold Put Purchase and Call Sold Options Net [Member] |  |  |
Assets: |  |  |
Fair value of derivative asset | 1,298 | 135 |
Palmarejo Royalty Obligation [Member] | Royalty obligation embedded derivative [Member] |  |  |
Liabilities: |  |  |
Derivative fair value of derivative liability | 43,960 |  |
Rochester Royalty Obligation [Member] | Royalty Obligation [Member] |  |  |
Liabilities: |  |  |
Derivative fair value of derivative liability | $ 23,656 |  |
Convertible Senior Notes Due March 2028 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.25% | 3.25% |
Senior Notes due Two Thousand Twenty One [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 7.875% | 7.875% | 7.875%

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