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Mortgage Loans on Real Estate (Impaired Mortgage Loans on Real Estate By Basis of Impairment) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Receivables [Abstract]    
Individually evaluated for impairment $ 1,247 $ 1,253
Collectively evaluated for impairment 3,058,018 2,951,211
Principal outstanding $ 3,059,265 $ 2,952,464