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Mortgage Loans on Real Estate (Mortgage Loans by Credit Quality Indicator) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Mortgage Loans on Real Estate [Abstract]      
Performing $ 2,438,341 $ 2,451,760  
In workout 11,568 0  
Delinquent 0 0  
Collateral dependent 0 5,961  
Principal outstanding $ 2,449,909 $ 2,457,721 $ 2,607,698