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Investments - Distribution of Fixed Maturity Securities by Expected Maturity (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Percent of Total Fair Value    
Due in 1 year or less, Percent of Total Fair Value 4.00% 3.60%
Due after 1 year through 5 years, Percent of Total Fair Value 26.30% 27.40%
Due after 5 years through 10 years, Percent of Total Fair Value 29.40% 29.60%
Due after 10 years through 20 years, Percent of Total Fair Value 26.50% 26.10%
Due after 20 years, Percent of Total Fair Value 13.80% 13.30%
Total, Percent of Total Fair Value 100.00% 100.00%
Fair Value    
Due in 1 year or less, Fair Value $ 230,397  
Due after 1 year through 5 years, Fair Value 1,535,965  
Due after 5 years through 10 years, Fair Value 1,719,303  
Due after 10 years through 20 years, Fair Value 1,550,562  
Due after 20 years, Fair Value 806,956  
Total fixed maturity securities 5,843,183 $ 5,791,676
Amortized Cost    
Due in 1 year or less, Amortized Cost 233,386  
Due after 1 year through 5 years, Amortized Cost 1,572,373  
Due after 5 years through 10 years, Amortized Cost 1,661,161  
Due after 10 years through 20 years, Amortized Cost 1,435,920  
Due after 20 years, Amortized Cost 750,626  
Amortized Cost $ 5,653,466 $ 5,456,980
Average option-adjusted duration, in years 6 years 1 month 6 days 6 years