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Investments (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Securities
Dec. 31, 2018
USD ($)
Securities
Dec. 31, 2017
USD ($)
Investments [Abstract]      
Percentage of fixed maturity portfolio rated investment grade based on NAIC designations 98.00% 97.00%  
Number of securities in unrealized loss position | Securities 1,033 2,715  
Percentage of unrealized losses on fixed maturity securities where securities are rated investment grade 79.00% 87.00%  
Proceeds from sales of available for sale fixed maturity securities $ 1,000,000 $ 2,500,000 $ 700,000
Principal repayments, calls and tenders of available for sale fixed maturity securities 2,300,000 1,400,000 $ 1,200,000
Assets on deposit with state agencies to meet regulatory requirements 51,600,000 49,200,000  
Fair value, concentration of risk, investments $ 0 $ 0