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Investments (Details 17) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Financing Receivable Recorded Investment Aging    
Total mortgage loans $ 2,270,214,000 $ 1,003,524,000
Mortgage Receivables Member
   
Financing Receivable Recorded Investment Aging    
Financing Receivable Recorded Investment 30 To 59 Days Past Due 16,627,000 21,800,000
Financing Receivable Recorded Investment 60 To 89 Days Past Due 0 0
Financing Receivable Recorded Investment Equal To Greater Than 90 Days Past Due 16,298,000 20,316,000
Total past due 32,925,000 42,116,000
Financing Receivable Recorded Investment Current 2,237,289,000 961,408,000
Total mortgage loans $ 2,270,214,000 $ 1,003,524,000