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Mortgage Loans on Real Estate (Summary of Mortgage Loan Portfolio) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Mortgage Loans on Real Estate [Abstract]    
Principal outstanding $ 2,470,456 $ 2,457,721
Loan loss allowance (17,518) (22,633)
Deferred prepayment fees (536) (508)
Mortgage loans on real estate $ 2,452,402 $ 2,434,580