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Mortgage Loans on Real Estate (Schedule of Financing Receivables Past Due) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Commercial mortgage loans, past due $ 0 $ 0
Commercial mortgage loans, current 2,898,538 2,672,093
Commercial mortgage loans, collateral dependent receivables 1,920 2,222
Principal outstanding 2,900,458 2,674,315
30 to 59 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Commercial mortgage loans, past due 0 0
60 to 89 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Commercial mortgage loans, past due 0 0
90 Days and Over    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Commercial mortgage loans, past due $ 0 $ 0