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Mortgage Loans on Real Estate (Aging of Financing Receivables) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Commercial mortgage loans, past due $ 2,737 $ 0  
Commercial mortgage loans, current 2,487,882 2,449,909  
Commercial mortgage loans, collateral dependent receivables 0 0  
Principal outstanding 2,490,619 2,449,909 $ 2,457,721
30 to 59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Commercial mortgage loans, past due 2,737 0  
60 to 89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Commercial mortgage loans, past due 0 0  
90 Days and Over Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Commercial mortgage loans, past due $ 0 $ 0