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Mortgage Loans on Real Estate (Mortgage Loans by Credit Quality Indicator) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Mortgage Loans on Real Estate [Abstract]    
Performing $ 2,617,058 $ 2,489,028
In workout 1,476 1,591
Delinquent 0 0
Collateral dependent 2,222 0
Principal outstanding $ 2,620,756 $ 2,490,619