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Investments (Age Analysis of Past Due Recorded Investments) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Document Period End Date Jun. 30, 2019  
Financing Receivable, Recorded Investment, Past Due $ 11,715 $ 0
Financing Receivable, Recorded Investment, Current 5,412,430 4,983,354
Loans Receivable, Gross, Commercial, Real Estate 5,424,145 4,983,354
Financing Receivables, 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing Receivable, Recorded Investment, Past Due $ 11,715 $ 0