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Financial Highlights (Net Investment Income Ratio To Average Shareholders Equity) (Details)
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3 Months Ended | 9 Months Ended | ||||||||||
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Sep. 30, 2011
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| Financial Highlights [Abstract] | ||||||||||||
| Net Investment Income | 7.04% | [1],[2] | 11.46% | [1],[2] | 7.65% | [1],[2] | 11.59% | [1],[2] | ||||
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