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Investments, Available-For-Sale (Details) (USD $)
9 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Investments, Available-For-Sale  
Fair Value of Total investments $ 28,968,000
Proceeds from sale of available-for-sale securities29,947,000 
Gross realized gains8,500,000 
Gross realized gains reclassified from accumulated other comprehensive income$ 4,900,000