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Fair Value Measurements (Details 1) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Assets: |  |
Total assets | $ 62,524 | $ 14,656
Liabilities: |  |
Total liabilities | 66,886 | 63,558
Royalty obligation embedded derivative [Member] |  |
Liabilities: |  |
Derivative fair value of derivative liability | 44,357 | 40,338
Royalty Obligation [Member] |  |
Liabilities: |  |
Derivative fair value of derivative liability | 22,303 |
Rochester Royalty Obligation [Member] |  |
Liabilities: |  |
Derivative fair value of derivative liability |  | 21,630
Other Derivative Instrument [Member] |  |
Assets: |  |
Fair value of derivative asset | 258 |
Liabilities: |  |
Derivative fair value of derivative liability |  | 1,590
Gold Put Purchase and Call Sold Options Net [Member] |  |
Assets: |  |
Fair value of derivative asset | 992 |
Liabilities: |  |
Derivative fair value of derivative liability | 226 |
Short-term Deposit [Member] |  |
Assets: |  |
Short-term Deposits | 45,628 | 14,521
Marketable securities [Member] |  |
Assets: |  |
Restricted certificates of deposits | 15,646 | 135
Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Total assets | 61,274 | 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 | 45,628 | 14,521
Fair Value, Inputs, Level 1 [Member] | Marketable securities [Member] |  |
Assets: |  |
Restricted certificates of deposits | 15,646 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Total assets | 1,250 | 135
Liabilities: |  |
Total liabilities | 226 | 1,590
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 | 258 |
Liabilities: |  |
Derivative fair value of derivative liability |  | 1,590
Fair Value, Inputs, Level 2 [Member] | Gold Put Purchase and Call Sold Options Net [Member] |  |
Liabilities: |  |
Derivative fair value of derivative liability | 226 |
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 | 66,660 | 61,968
Fair Value, Inputs, Level 3 [Member] | Royalty obligation embedded derivative [Member] |  |
Liabilities: |  |
Derivative fair value of derivative liability | 44,357 | 40,338
Fair Value, Inputs, Level 3 [Member] | Royalty Obligation [Member] |  |
Liabilities: |  |
Derivative fair value of derivative liability | 22,303 |
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

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