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Mortgage Loans on Real Estate (Summary of Mortgage Loan Portfolio) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]    
Loan loss allowance $ (5,617) $ (10,969)
Carrying value 2,593,851 2,623,940
Commercial Real Estate Portfolio Segment [Member]
   
Mortgage Loans on Real Estate [Line Items]    
Principal outstanding 2,625,563 2,658,883
Loan loss allowance 31,118 34,234
Deferred prepayment fees (594) (709)
Carrying value $ 2,593,851 $ 2,623,940