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Mortgage Loans on Real Estate (Summary of Mortgage Loan Portfolio) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Mortgage Loans on Real Estate [Abstract]      
Principal outstanding $ 2,449,909 $ 2,457,721 $ 2,607,698
Loan loss allowance (14,142) (22,633)  
Deferred prepayment fees (510) (508)  
Mortgage loans on real estate $ 2,435,257 $ 2,434,580