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Mortgage Loans on Real Estate (Mortgage Loans by Credit Quality Indicator) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Receivables [Abstract]    
Performing $ 3,059,265 $ 2,952,464
In workout 0 0
Collateral dependent 0 0
Principal outstanding $ 3,059,265 $ 2,952,464