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Mortgage Loans on Real Estate (Impaired Mortgage Loans on Real Estate by Basis of Impairment) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Mortgage Loans on Real Estate [Abstract]    
Individually evaluated for impairment $ 10,342 $ 21,277
Collectively evaluated for impairment 2,453,070 2,428,632
Principal outstanding $ 2,463,412 $ 2,449,909