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Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Fair Value    
Total $ 875,275 $ 940,011
Fixed Maturities    
Cost or Amortized Cost    
Due in one year or less 65,306  
Due after one year through five years 179,535  
Due after five years through ten years 277,246  
Due after ten years 19,313  
Asset and mortgage backed securities 342,820  
Cost or adjusted/amortized cost $ 884,220 926,714
Percent of Total    
Due in one year or less 7.40%  
Due after one year through five years 20.20%  
Due after five years through ten years 31.40%  
Due after ten years 2.20%  
Asset and mortgage backed securities 38.80%  
Total 100.00%  
Fair Value    
Due in one year or less $ 65,694  
Due after one year through five years 182,453  
Due after five years through ten years 268,740  
Due after ten years 18,309  
Asset and mortgage backed securities 340,079  
Total $ 875,275 $ 940,011
Percent of Total    
Due in one year or less 7.50%  
Due after one year through five years 20.80%  
Due after five years through ten years 30.70%  
Due after ten years 2.10%  
Asset and mortgage backed securities 38.90%  
Total 100.00%