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Investments - Distribution of Fixed Maturity Securities by Expected Maturity (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Percent of Total Fair Value    
Due in 1 year or less 4.20% 3.60%
Due after 1 year through 5 years 28.10% 27.40%
Due after 5 years through 10 years 28.90% 29.60%
Due after 10 years through 20 years 24.30% 26.10%
Due after 20 years 14.50% 13.30%
Total 100.00% 100.00%
Fair Value    
Due in 1 year or less $ 261,323  
Due after 1 year through 5 years 1,734,450  
Due after 5 years through 10 years 1,782,261  
Due after 10 years through 20 years 1,496,331  
Due after 20 years 894,193  
Total 6,168,558 $ 5,791,676
Amortized Cost    
Due in 1 year or less 258,244  
Due after 1 year through 5 years 1,676,356  
Due after 5 years through 10 years 1,628,583  
Due after 10 years through 20 years 1,309,759  
Due after 20 years 799,373  
Amortized Cost $ 5,672,315 $ 5,456,980
Average option-adjusted duration, in years 6 years 3 months 18 days 6 years