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Investments - Gross Unrealized Losses (Details)
$ in Thousands
Dec. 31, 2025
USD ($)
security
Dec. 31, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Marketable Securities        
Fixed maturity securities, Cost or Amortized Cost $ 1,337,235 $ 1,181,038    
Fixed maturity securities, Allowance for Expected Credit Losses 0 (1,198)    
Fixed maturity securities, Gross Unrealized Gains 14,135 3,753    
Fixed maturity securities, Gross Unrealized Losses (35,822) (68,375)    
Fixed maturity securities, Estimated Fair Value 1,315,548 1,115,218    
Short-term investments, Cost or Amortized Cost 0 19,970    
Short-term investments, Unrealized Gains   5    
Short-term investments, Estimated Fair Value   19,975    
Equity securities, Cost or Amortized Cost 201,591 201,258    
Equity securities, Estimated Fair Value 220,953 221,422    
Other invested assets 151,020 156,444    
Cost or Amortized Cost 1,689,846 1,558,710    
Gross Unrealized Gains 41,462 33,002    
Gross Unrealized Losses (43,787) (77,455)    
Estimated Fair Value $ 1,687,521 $ 1,513,059    
Number of securities in an unrealized loss position | security 700 884    
U.S. Treasury securities        
Marketable Securities        
Fixed maturity securities, Cost or Amortized Cost $ 4,211 $ 2,418    
Fixed maturity securities, Gross Unrealized Gains 22 2    
Fixed maturity securities, Gross Unrealized Losses (28) (77)    
Fixed maturity securities, Estimated Fair Value 4,205 2,343    
Obligations of states and political subdivisions        
Marketable Securities        
Fixed maturity securities, Cost or Amortized Cost 38,837 38,581    
Fixed maturity securities, Gross Unrealized Gains 532 170    
Fixed maturity securities, Gross Unrealized Losses (1,651) (2,585)    
Fixed maturity securities, Estimated Fair Value 37,718 36,166    
Residential mortgage-backed securities        
Marketable Securities        
Fixed maturity securities, Cost or Amortized Cost 376,354 327,161    
Fixed maturity securities, Gross Unrealized Gains 5,075 601    
Fixed maturity securities, Gross Unrealized Losses (15,382) (26,535)    
Fixed maturity securities, Estimated Fair Value 366,047 301,227    
Commercial mortgage-backed securities        
Marketable Securities        
Fixed maturity securities, Cost or Amortized Cost 162,755 140,124    
Fixed maturity securities, Gross Unrealized Gains 702 91    
Fixed maturity securities, Gross Unrealized Losses (6,439) (10,840)    
Fixed maturity securities, Estimated Fair Value 157,018 129,375    
Other asset-backed securities        
Marketable Securities        
Fixed maturity securities, Cost or Amortized Cost 170,332 65,456    
Fixed maturity securities, Gross Unrealized Gains 373 155    
Fixed maturity securities, Gross Unrealized Losses (1,196) (1,894)    
Fixed maturity securities, Estimated Fair Value 169,509 63,717    
Corporate and other securities        
Marketable Securities        
Fixed maturity securities, Cost or Amortized Cost 584,746 607,298    
Fixed maturity securities, Allowance for Expected Credit Losses   (1,198) $ (1,208) $ (678)
Fixed maturity securities, Gross Unrealized Gains 7,431 2,734    
Fixed maturity securities, Gross Unrealized Losses (11,126) (26,444)    
Fixed maturity securities, Estimated Fair Value 581,051 582,390    
Equity securities        
Marketable Securities        
Equity securities, Cost or Amortized Cost 201,591 201,258    
Equity securities, Gross Unrealized Gains 27,327 29,244    
Equity securities, Gross Unrealized Losses (7,965) (9,080)    
Equity securities, Estimated Fair Value 220,953 221,422    
Other invested assets        
Marketable Securities        
Other invested assets 151,020 156,444    
Other invested assets, Estimated Fair Value $ 151,020 $ 156,444