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Investments (Age Analysis of Past Due Recorded Investment In Mortgage Loans) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Financing Receivable Recorded Investment Aging    
Total mortgage loans $ 2,496,251 $ 2,312,167
Investment in mortgage loans
   
Financing Receivable Recorded Investment Aging    
31-60 days past due 0 7,504
61-90 days past due 0 0
Greater than 90 days 3,046 16,886
Total past due 3,046 24,390
Current 2,493,205 2,287,777
Total mortgage loans $ 2,496,251 $ 2,312,167