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Investments (Details Textuals) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Investments (Textuals)    
Realized net gains (losses) from sale of securities $ 328 $ (164)
Proceeds from sale of available-for-sale securities 5,808 7,117
Cash surrender value of insurance contracts $ 67,068 $ 67,699