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Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Fair Value    
Total $ 884,940 $ 940,011
Fixed Maturities    
Cost or Amortized Cost    
Due in one year or less 66,172  
Due after one year through five years 263,885  
Due after five years through ten years 206,617  
Due after ten years 12,258  
Asset and mortgage backed securities 339,723  
Cost or adjusted/amortized cost $ 888,655 926,714
Percent of Total    
Due in one year or less 7.40%  
Due after one year through five years 29.70%  
Due after five years through ten years 23.30%  
Due after ten years 1.40%  
Asset and mortgage backed securities 38.20%  
Total 100.00%  
Fair Value    
Due in one year or less $ 66,609  
Due after one year through five years 265,546  
Due after five years through ten years 203,091  
Due after ten years 11,818  
Asset and mortgage backed securities 337,876  
Total $ 884,940 $ 940,011
Percent of Total    
Due in one year or less 7.50%  
Due after one year through five years 30.00%  
Due after five years through ten years 22.90%  
Due after ten years 1.30%  
Asset and mortgage backed securities 38.30%  
Total 100.00%