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Investments (Textuals) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Investments (Textuals)      
Realized gain (losses) from sale of securities $ (1,505) $ 33  
Proceeds from sale of available-for-sale securities 52,292 38,016 0
Cash surrender value of insurance contracts $ 67,699 $ 67,975