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Mortgage Loans on Real Estate (Schedule of Financing Receivables Past Due) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Commercial mortgage loans, past due $ 0 $ 2,737
Commercial mortgage loans, current 2,560,227 2,487,882
Commercial mortgage loans, collateral dependent receivables 2,222 0
Principal outstanding 2,562,449 2,490,619
30 to 59 Days [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Commercial mortgage loans, past due 0 2,737
60 to 89 Days [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Commercial mortgage loans, past due 0 0
90 Days and Over [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Commercial mortgage loans, past due $ 0 $ 0