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Investments (Narrative) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
Securities
Mar. 31, 2019
USD ($)
Dec. 31, 2019
Securities
Investments [Abstract]      
Percentage of fixed maturity portfolio rated investment grade based on NAIC designations 98.00%   98.00%
Number of securities in unrealized loss position | Securities 2,475   1,033
Percentage of unrealized losses on fixed maturity securities where securities are rated investment grade 84.00%   79.00%
Proceeds from sales of available for sale fixed maturity securities $ 910,300 $ 136,000  
Principal repayments, calls and tenders for available for sale fixed maturity securities $ 1,000,000 150,900  
Other than temporary impairment losses   $ 0