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Investments (Details Textuals) (USD $)
In Thousands
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Investments (Textuals)     
Realized net losses from sale of securities$ (872)$ 0$ (2,340)$ 33 
Proceeds from sale of available-for-sale securities  43,18235,624 
Cash surrender value of insurance contracts$ 65,840 $ 65,840 $ 67,975