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Other Investments (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended | 132 Months Ended |  | 1 Months Ended |  |  | 1 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 28, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 | Apr. 30, 2011 | Apr. 30, 2011 Midas Gold Corp [Member] | Dec. 31, 2013 Midas Gold Corp [Member] | Dec. 31, 2012 Midas Gold Corp [Member] | Apr. 30, 2011 Midas Gold Corp [Member] Private Placement [Member]
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares issued in transaction, (Shares) |  |  |  | 30,402,615 |  |  |  | 30,402,615 |  |  |
Number of shares acquired (in shares) |  |  |  |  |  |  |  |  |  |  | 1,400,000
Aggregate purchase price |  |  |  |  |  |  |  |  |  |  | $ 3,632
Common stock, shares held (in shares) |  | 82,275,217 | 81,563,498 |  |  | 81,563,498 |  |  | 31,802,615 | 31,802,615 |
Stock Issued During Period, Value, New Issues |  | 477 | 23,464 | 30,988 | 161,148 |  |  |  |  |  |
Total Midas Common Stock Outstanding (in shares) | 15,802,615 |  |  |  |  |  |  |  |  |  |
Percentage of basic shares of subsidiary held | 12.40% |  |  |  |  |  |  |  |  |  |
Fair value of shares received |  |  |  | 78,872 |  |  | 78,872 |  |  |  |
Deferred income tax benefit/(expense) |  | 15,373 | 20,147 | (35,522) |  | (2) |  | 29,675 |  |  |
Valuation allowance |  | 43,955 | 41,817 | 29,291 |  | 41,817 | 6,086 |  |  |  |
Unrealized loss on Midas Gold Shares |  | (48,499) | (50,363) | 37,347 |  | (61,515) |  |  |  |  |
Estimated Income Tax Expense (Benefit), for the Period |  | 17,915 | 19,576 |  |  |  |  |  |  |  |
Midas Gold shares held at the end of the period |  | 82,275,217 | 81,563,498 |  |  | 81,563,498 |  |  | 31,802,615 | 31,802,615 |
Fair value at beginning of period |  | 69,489 | 119,851 |  |  |  |  |  |  |  |
Unrealized Gain (Loss) Based on Fair Value at the End of the Period |  | (48,499) | (50,363) |  |  |  |  |  |  |  |
Fair value at end of period |  | $ 20,990 | $ 69,489 | $ 119,851 |  | $ 69,489 |  |  |  |  |

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