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Investments (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Securities
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Securities
Jun. 30, 2019
USD ($)
Dec. 31, 2019
Securities
Investments [Abstract]          
Percentage of fixed maturity portfolio rated investment grade based on NAIC designations 97.00%   97.00%   98.00%
Number of securities in unrealized loss position | Securities 1,613   1,613   1,033
Percentage of unrealized losses on fixed maturity securities where securities are rated investment grade 80.00%   80.00%   79.00%
Proceeds from sales of available for sale fixed maturity securities     $ 973,400 $ 359,300  
Principal repayments, calls and tenders for available for sale fixed maturity securities     1,400,000 500,500  
Other than temporary impairment losses $ 0 $ 1,213 $ 0 $ 1,213