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Investments Available-for-Sale Securities in a Loss Position Narrative (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Rate
Dec. 31, 2018
USD ($)
Rate
Debt Securities, Available-for-sale [Line Items]    
Number of available-for-sale securities in unrealized loss positions 120 317
Total estimated fair value $ 187,012 $ 350,882
Total gross unrealized holding losses $ 1,497 $ 6,868
Number of available-for-sale securities in unrealized loss positions, greater than one year 65 158
Other-than- temporary impairment losses $ 0 $ 0
Fixed maturities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities, percentage of securities with ratings of A minus or better | Rate 87.90% 86.40%