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Investments (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
security
Dec. 31, 2021
USD ($)
security
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Marketable Securities        
Fixed maturity securities, amortized cost $ 1,165,592 $ 1,187,857    
Fixed maturity securities, allowance for expected credit losses (691) (691) $ (873) $ (1,054)
Fixed maturity securities, Gross Unrealized Gains 8,274 36,923    
Fixed maturity securities, Gross Unrealized Losses (37,107) (5,810)    
Fixed maturity securities, Estimated Fair Value 1,136,068 1,218,279    
Short term investments, at cost 5 0    
Short term investments 5 0    
Equity securities, Cost or Amortized Cost 218,636 211,848    
Equity securities, Estimated Fair Value 258,699 264,945    
Other invested assets 91,460 87,911    
Cost or Amortized Cost 1,475,693 1,487,616    
Gross Unrealized Gains 53,141 91,784    
Gross Unrealized Losses (41,911) (7,574)    
Estimated Fair Value $ 1,486,232 $ 1,571,135    
Number of securities in an unrealized loss position | security 937 444    
Residential mortgage backed securities, fair value $ 35,899      
U.S. Treasury securities        
Marketable Securities        
Fixed maturity securities, amortized cost 1,827 $ 318    
Fixed maturity securities, Gross Unrealized Gains   6    
Fixed maturity securities, Gross Unrealized Losses (71)      
Fixed maturity securities, Estimated Fair Value 1,756 324    
Obligations of states and political subdivisions        
Marketable Securities        
Fixed maturity securities, amortized cost 89,553 111,578    
Fixed maturity securities, Gross Unrealized Gains 1,510 4,847    
Fixed maturity securities, Gross Unrealized Losses (1,360) (123)    
Fixed maturity securities, Estimated Fair Value 89,703 116,302    
Residential mortgage backed securities, fair value 35,899      
Residential mortgage-backed securities        
Marketable Securities        
Fixed maturity securities, amortized cost 229,117 237,026    
Fixed maturity securities, Gross Unrealized Gains 1,089 5,941    
Fixed maturity securities, Gross Unrealized Losses (9,019) (1,503)    
Fixed maturity securities, Estimated Fair Value 221,187 241,464    
Commercial mortgage-backed securities        
Marketable Securities        
Fixed maturity securities, amortized cost 154,241 146,318    
Fixed maturity securities, Gross Unrealized Gains 597 5,007    
Fixed maturity securities, Gross Unrealized Losses (5,014) (442)    
Fixed maturity securities, Estimated Fair Value 149,824 150,883    
Other asset-backed securities        
Marketable Securities        
Fixed maturity securities, amortized cost 74,709 83,376    
Fixed maturity securities, Gross Unrealized Gains 201 475    
Fixed maturity securities, Gross Unrealized Losses (2,091) (255)    
Fixed maturity securities, Estimated Fair Value 72,819 83,596    
Corporate and other securities        
Marketable Securities        
Fixed maturity securities, amortized cost 616,145 609,241    
Fixed maturity securities, allowance for expected credit losses (691) (691)    
Fixed maturity securities, Gross Unrealized Gains 4,877 20,647    
Fixed maturity securities, Gross Unrealized Losses (19,552) (3,487)    
Fixed maturity securities, Estimated Fair Value 600,779 625,710    
Short term Investments.        
Marketable Securities        
Fixed maturity securities, amortized cost 5      
Fixed maturity securities, Estimated Fair Value 5      
Equity securities        
Marketable Securities        
Fixed maturity securities, amortized cost 218,636 211,848    
Fixed maturity securities, Gross Unrealized Gains 44,867 54,861    
Fixed maturity securities, Gross Unrealized Losses (4,804) (1,764)    
Fixed maturity securities, Estimated Fair Value 258,699 264,945    
Other invested assets        
Marketable Securities        
Other invested assets 91,460 87,911    
Other invested assets, Estimated Fair Value $ 91,460 $ 87,911