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Other Investments (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 138 Months Ended |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Dec. 31, 2012 | Dec. 31, 2012 Midas Gold Corp [Member] | Apr. 30, 2011 Midas Gold Corp [Member] | Jun. 30, 2013 Midas Gold Corp [Member] | Jun. 30, 2013 Midas Gold Corp [Member] | Apr. 06, 2011 Midas Gold Corp [Member]
Sale of Stock, Number of Shares Issued in Transaction |  |  |  |  |  |  |  | 30,402,615 |  |  |
Capital stock, shares outstanding (in shares) | 81,788,835 |  | 81,788,835 |  | 81,788,835 | 81,563,498 |  |  |  |  | 31,802,615
Fair value of shares received |  |  |  |  |  |  |  |  | $ 22,167 | $ 22,167 |
Deferred Income Tax Expense (Benefit) | (4,411) | (13,210) | (15,374) | (16,201) | 1 |  |  |  | 6,806 | 17,371 |
Unrealized gain/ (loss) on long-term investments | (18,541) | (34,951) | (47,322) | (42,316) | (60,338) |  |  |  | 18,541 | 47,322 |
Number of Shares Acquired |  |  |  |  |  |  |  | 1,400,000 |  |  |
Purchase Price of Private Placement |  |  |  |  |  |  |  | $ 3,632 |  |  |
Sale of Stock, Percentage of Ownership after Transaction |  |  |  |  |  |  | 27.70% |  |  |  |

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