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Other Investments (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended | 141 Months Ended |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Dec. 31, 2012 | Apr. 30, 2011 Midas Gold Corp [Member] | Sep. 30, 2013 Midas Gold Corp [Member] | Sep. 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 | 81,788,835 | 81,788,835 | 81,563,498 |  |  |  | 31,802,615
Fair value of shares received |  |  |  |  |  |  |  | $ 26,714 | $ 26,714 |
Deferred Income Tax Expense (Benefit) | 1 | 9,925 | (15,373) | (6,276) | 2 |  |  | 1,670 | 15,701 |
Percentage Of Shares Owned of Fair Value Investee |  |  |  |  |  |  |  | 24.90% | 24.90% |
Unrealized gain/ (loss) on long-term investments | 4,547 | 29,132 | (42,775) | (13,184) | (55,791) |  |  | 4,547 | 42,775 |
Number of Shares Acquired |  |  |  |  |  |  | 1,400,000 |  |  |
Purchase Price of Private Placement |  |  |  |  |  |  | $ 3,632 |  |  |
Sale of Stock, Percentage of Ownership after Transaction | 24.90% |  |  |  |  |  |  |  |  |

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