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Investments (Details Textuals 5) (USD $)
Sep. 30, 2011
Dec. 31, 2010
Investments [Abstract]  
Equity securities holdings exposure in single issuer greater than stated percentage of Company's equity10.00%10.00%
Equity securities holdings exposure amount of a single issuer greater than 10% of Company's equity$ 0$ 0
Equity securities holdings exposure in single issuer greater than stated percentage of Company's total investments1.00%1.00%
Equity securities holdings exposure amount of a single issuer greater than 10% of Company's total investments$ 0$ 0