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Mortgage Loans on Real Estate (Summary of Mortgage Loan Portfolio) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Mortgage Loans on Real Estate [Abstract]    
Principal outstanding $ 2,570,950 $ 2,607,698
Loan loss allowance (26,582) (26,047)
Deferred prepayment fees (558) (569)
Mortgage loans on real estate $ 2,543,810 $ 2,581,082