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Investments (Details 13) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]    
Loans Receivable Commercial Real Estate $ 2,335,115,000 $ 2,312,167,000
Mortgage Loans On Real Estate Due One Year Through Five Years [Member]
   
Mortgage Loans on Real Estate [Line Items]    
Loans Receivable Commercial Real Estate 1,157,373,000 1,187,387,000
Mortgage Loans On Real Estate Due After Five Years [Member]
   
Mortgage Loans on Real Estate [Line Items]    
Loans Receivable Commercial Real Estate 832,292,000 776,655,000
Mortgage Loans On Real Estate Due After Ten Years [Member]
   
Mortgage Loans on Real Estate [Line Items]    
Loans Receivable Commercial Real Estate $ 345,450,000 $ 348,125,000