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Investments (Details)
$ in Thousands
Dec. 31, 2022
USD ($)
security
Dec. 31, 2021
USD ($)
security
Dec. 31, 2020
USD ($)
Jan. 01, 2020
USD ($)
Marketable Securities        
Fixed maturity securities, amortized cost $ 1,152,779 $ 1,187,857    
Fixed maturity securities, allowance for expected credit losses (678) (691)   $ (2,510)
Fixed maturity securities, Gross Unrealized Gains 1,514 36,923    
Fixed maturity securities, Gross Unrealized Losses (103,460) (5,810)    
Fixed maturity securities, Estimated Fair Value 1,050,155 1,218,279    
Equity securities, Cost or Amortized Cost 231,444 211,848    
Equity securities, Estimated Fair Value 240,155 264,945    
Other invested assets 112,850 87,911    
Cost or Amortized Cost 1,497,073 1,487,616    
Gross Unrealized Gains 33,371 91,784    
Gross Unrealized Losses (126,606) (7,574)    
Estimated Fair Value $ 1,403,160 $ 1,571,135    
Number of securities in an unrealized loss position | security 1,195 444    
Residential mortgage backed securities, fair value $ 40,195      
U.S. Treasury securities        
Marketable Securities        
Fixed maturity securities, amortized cost 1,825 $ 318    
Fixed maturity securities, Gross Unrealized Gains   6    
Fixed maturity securities, Gross Unrealized Losses (156)      
Fixed maturity securities, Estimated Fair Value 1,669 324    
Obligations of states and political subdivisions        
Marketable Securities        
Fixed maturity securities, amortized cost 57,319 111,578    
Fixed maturity securities, Gross Unrealized Gains 282 4,847    
Fixed maturity securities, Gross Unrealized Losses (3,532) (123)    
Fixed maturity securities, Estimated Fair Value 54,069 116,302    
Residential mortgage-backed securities        
Marketable Securities        
Fixed maturity securities, amortized cost 259,878 237,026    
Fixed maturity securities, Gross Unrealized Gains 385 5,941    
Fixed maturity securities, Gross Unrealized Losses (25,761) (1,503)    
Fixed maturity securities, Estimated Fair Value 234,502 241,464    
Commercial mortgage-backed securities        
Marketable Securities        
Fixed maturity securities, amortized cost 156,303 146,318    
Fixed maturity securities, Gross Unrealized Gains 107 5,007    
Fixed maturity securities, Gross Unrealized Losses (16,479) (442)    
Fixed maturity securities, Estimated Fair Value 139,931 150,883    
Other asset-backed securities        
Marketable Securities        
Fixed maturity securities, amortized cost 74,160 83,376    
Fixed maturity securities, Gross Unrealized Gains   475    
Fixed maturity securities, Gross Unrealized Losses (5,429) (255)    
Fixed maturity securities, Estimated Fair Value 68,731 83,596    
Corporate and other securities        
Marketable Securities        
Fixed maturity securities, amortized cost 603,294 609,241    
Fixed maturity securities, allowance for expected credit losses (678) (691) $ (1,054)  
Fixed maturity securities, Gross Unrealized Gains 740 20,647    
Fixed maturity securities, Gross Unrealized Losses (52,103) (3,487)    
Fixed maturity securities, Estimated Fair Value 551,253 625,710    
Equity securities        
Marketable Securities        
Equity securities, Cost or Amortized Cost 231,444      
Equity securities, Estimated Fair Value 240,155 264,945    
Other invested assets   211,848    
Equity securities, Gross Unrealized Gains 31,857 54,861    
Equity securities, Gross Unrealized Losses (23,146) (1,764)    
Other invested assets        
Marketable Securities        
Other invested assets 112,850 87,911    
Other invested assets, Estimated Fair Value $ 112,850 $ 87,911