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Mortgage Loans on Real Estate (Impaired Mortgage Loans on Real Estate by Basis of Impairment) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mortgage Loans on Real Estate [Abstract]    
Individually evaluated for impairment $ 19,055 $ 21,277
Collectively evaluated for impairment 2,464,727 2,428,632
Principal outstanding $ 2,483,782 $ 2,449,909