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Fair Value Measurements (Details 1) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Assets: |  |
Total assets |  | $ 9,864
Liabilities: |  |
Total liabilities | $ 20,395 | 39,126
Royalty obligation embedded derivative [Member] |  |
Liabilities: |  |
Derivative fair value of derivative liability |  | 21,912
Rochester Royalty Obligation [Member] |  |
Liabilities: |  |
Derivative fair value of derivative liability |  | 15,370
Other Derivative Instrument [Member] |  |
Liabilities: |  |
Derivative fair value of derivative liability | 431 | 805
Gold Put Purchase and Call Sold Options Net [Member] |  |
Liabilities: |  |
Derivative fair value of derivative liability |  | 1,039
Short-term Deposit [Member] |  |
Assets: |  |
Short-term deposits |  | 5,982
Marketable securities [Member] |  |
Assets: |  |
Restricted certificates of deposits | 3,213 | 3,882
Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Total assets |  | 4,603
Liabilities: |  |
Total liabilities | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Royalty obligation embedded derivative [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] |  |
Liabilities: |  |
Derivative fair value of derivative liability | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Gold Put Purchase and Call Sold Options Net [Member] |  |
Liabilities: |  |
Derivative fair value of derivative liability |  | 0
Fair Value, Inputs, Level 1 [Member] | Short-term Deposit [Member] |  |
Assets: |  |
Short-term deposits |  | 4,603
Fair Value, Inputs, Level 1 [Member] | Marketable securities [Member] |  |
Assets: |  |
Restricted certificates of deposits | 3,124 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Total assets |  | 3,882
Liabilities: |  |
Total liabilities | 431 | 1,844
Fair Value, Inputs, Level 2 [Member] | Royalty obligation embedded derivative [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] |  |
Liabilities: |  |
Derivative fair value of derivative liability | 431 | 805
Fair Value, Inputs, Level 2 [Member] | Gold Put Purchase and Call Sold Options Net [Member] |  |
Liabilities: |  |
Derivative fair value of derivative liability |  | 1,039
Fair Value, Inputs, Level 2 [Member] | Short-term Deposit [Member] |  |
Assets: |  |
Short-term deposits |  | 0
Fair Value, Inputs, Level 2 [Member] | Marketable securities [Member] |  |
Assets: |  |
Restricted certificates of deposits | 0 | 3,882
Fair Value, Inputs, Level 3 [Member] |  |
Assets: |  |
Total assets |  | 1,379
Liabilities: |  |
Total liabilities | 19,964 | 37,282
Fair Value, Inputs, Level 3 [Member] | Royalty obligation embedded derivative [Member] |  |
Liabilities: |  |
Derivative fair value of derivative liability |  | 21,912
Fair Value, Inputs, Level 3 [Member] | Rochester Royalty Obligation [Member] |  |
Liabilities: |  |
Derivative fair value of derivative liability |  | 15,370
Fair Value, Inputs, Level 3 [Member] | Other Derivative Instrument [Member] |  |
Liabilities: |  |
Derivative fair value of derivative liability | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Gold Put Purchase and Call Sold Options Net [Member] |  |
Liabilities: |  |
Derivative fair value of derivative liability |  | 0
Fair Value, Inputs, Level 3 [Member] | Short-term Deposit [Member] |  |
Assets: |  |
Short-term deposits |  | 1,379
Fair Value, Inputs, Level 3 [Member] | Marketable securities [Member] |  |
Assets: |  |
Restricted certificates of deposits | 89 | $ 0
Palmarejo Royalty Obligation [Member] | Royalty obligation embedded derivative [Member] |  |
Liabilities: |  |
Derivative fair value of derivative liability | 9,024 |
Palmarejo Royalty Obligation [Member] | Fair Value, Inputs, Level 1 [Member] | Royalty obligation embedded derivative [Member] |  |
Liabilities: |  |
Derivative fair value of derivative liability | 0 |
Palmarejo Royalty Obligation [Member] | Fair Value, Inputs, Level 2 [Member] | Royalty obligation embedded derivative [Member] |  |
Liabilities: |  |
Derivative fair value of derivative liability | 0 |
Palmarejo Royalty Obligation [Member] | Fair Value, Inputs, Level 3 [Member] | Royalty obligation embedded derivative [Member] |  |
Liabilities: |  |
Derivative fair value of derivative liability | 9,024 |
Rochester Royalty Obligation [Member] | Royalty Obligation [Member] |  |
Liabilities: |  |
Derivative fair value of derivative liability | 10,940 |
Rochester Royalty Obligation [Member] | Fair Value, Inputs, Level 1 [Member] | Royalty Obligation [Member] |  |
Liabilities: |  |
Derivative fair value of derivative liability | 0 |
Rochester Royalty Obligation [Member] | Fair Value, Inputs, Level 2 [Member] | Royalty Obligation [Member] |  |
Liabilities: |  |
Derivative fair value of derivative liability | 0 |
Rochester Royalty Obligation [Member] | Fair Value, Inputs, Level 3 [Member] | Royalty Obligation [Member] |  |
Liabilities: |  |
Derivative fair value of derivative liability | $ 10,940 |

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