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Mortgage Loans on Real Estate (Mortgage Loans by Credit Quality Indicator) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Receivables [Abstract]      
Performing $ 2,952,464 $ 2,670,657  
In workout 0 1,436  
Collateral dependent 0 2,222  
Principal outstanding $ 2,952,464 $ 2,674,315 $ 2,490,619