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Business and Significant Accounting Policies - Kinross Shares Sold (Details) (USD $) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Accounting Policies [Abstract] |  |  |  |
Shares sold | 60,000 | 150,000 | 60,000 | 180,000
Proceeds | $ 313,000 | $ 1,238,000 | $ 313,000 | $ 1,591,000
Gain on sale | $ 270,000 | $ 1,132,000 | $ 270,000 | $ 1,464,000

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