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Mortgage Loans on Real Estate (Mortgage Loans by Credit Quality Indicator) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mortgage Loans on Real Estate [Abstract]    
Performing $ 2,475,671 $ 2,438,341
In workout 1,678 11,568
Delinquent 0 0
Collateral dependent 6,433 0
Principal outstanding $ 2,483,782 $ 2,449,909