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Financial Highlights (Expense Ratios 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] | ||||||||||||
| Operating expenses before incentive fee and interest expense | (2.93%) | [1],[2] | (3.12%) | [1],[2] | (2.97%) | [1],[2] | (3.10%) | [1],[2] | ||||
| Incentive fee | (2.14%) | [1],[2] | 0.00% | [1],[2] | (2.88%) | [1],[2] | (0.16%) | [1],[2] | ||||
| Interest expense | (1.74%) | [1],[2] | (1.70%) | [1],[2] | (1.88%) | [1],[2] | (1.64%) | [1],[2] | ||||
| Total Expenses | (6.81%) | [1],[2] | (4.82%) | [1],[2] | (7.73%) | [1],[2] | (4.90%) | [1],[2] | ||||
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