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Fair Value Measurements (Details 1) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Assets: |  |
Total assets | $ 11,905 |
Liabilities: |  |
Total liabilities | 15,876 | $ 15,058
Royalty obligation embedded derivative [Member] |  |
Liabilities: |  |
Derivative fair value of derivative liability |  | 4,957
Rochester Royalty Obligation [Member] |  |
Liabilities: |  |
Derivative fair value of derivative liability |  | 9,593
Other Derivative Instrument [Member] |  |
Assets: |  |
Fair value of derivative asset | 655 |
Liabilities: |  |
Derivative fair value of derivative liability |  | 508
Equity Securities [Member] |  |
Assets: |  |
Equity securities | 11,250 | 2,766
Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Total assets | 11,243 |
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] |  |
Assets: |  |
Fair value of derivative asset | 0 |
Liabilities: |  |
Derivative fair value of derivative liability |  | 0
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] |  |
Assets: |  |
Equity securities | 11,243 | 2,756
Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Total assets | 655 |
Liabilities: |  |
Total liabilities | 0 | 508
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] |  |
Assets: |  |
Fair value of derivative asset | 655 |
Liabilities: |  |
Derivative fair value of derivative liability |  | 508
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] |  |
Assets: |  |
Equity securities | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |
Assets: |  |
Total assets | 7 |
Liabilities: |  |
Total liabilities | 15,876 | 14,550
Fair Value, Inputs, Level 3 [Member] | Royalty obligation embedded derivative [Member] |  |
Liabilities: |  |
Derivative fair value of derivative liability |  | 4,957
Fair Value, Inputs, Level 3 [Member] | Rochester Royalty Obligation [Member] |  |
Liabilities: |  |
Derivative fair value of derivative liability |  | 9,593
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] | Equity Securities [Member] |  |
Assets: |  |
Equity securities | 7 | $ 10
Palmarejo Royalty Obligation [Member] | Royalty obligation embedded derivative [Member] |  |
Liabilities: |  |
Derivative fair value of derivative liability | 3,317 |
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 | 3,317 |
Rochester Royalty Obligation [Member] | Royalty Obligation [Member] |  |
Liabilities: |  |
Derivative fair value of derivative liability | 12,559 |
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 | $ 12,559 |

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