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Investments (Details 15) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Mortgage Loans on Real Estate [Line Items]    
Loans Receivable Commercial Real Estate $ 2,270,214,000 $ 1,003,524,000
Mortgage Loans On Real Estate Due One Year Through Five Years [Member]
   
Mortgage Loans on Real Estate [Line Items]    
Loans Receivable Commercial Real Estate 1,234,191,000 493,027,000
Mortgage Loans On Real Estate Due After Five Years [Member]
   
Mortgage Loans on Real Estate [Line Items]    
Loans Receivable Commercial Real Estate 731,618,000 299,252,000
Mortgage Loans On Real Estate Due After Ten Years [Member]
   
Mortgage Loans on Real Estate [Line Items]    
Loans Receivable Commercial Real Estate $ 304,405,000 $ 211,245,000