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Mortgage Loans on Real Estate (Summary of Mortgage Loan Portfolio) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mortgage Loans on Real Estate [Abstract]      
Principal outstanding $ 2,607,698 $ 2,658,883 $ 2,856,011
Loan loss allowance (26,047) (34,234)  
Deferred prepayment fees (569) (709)  
Mortgage loans on real estate $ 2,581,082 $ 2,623,940