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Investments (Details)
$ in Thousands
Sep. 30, 2022
USD ($)
security
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
security
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Marketable Securities            
Fixed maturity securities, amortized cost $ 1,154,503   $ 1,187,857      
Fixed maturity securities, allowance for expected credit losses (898)   (691)      
Fixed maturity securities, Gross Unrealized Gains 586   36,923      
Fixed maturity securities, Gross Unrealized Losses (115,089)   (5,810)      
Fixed maturity securities, Estimated Fair Value 1,039,102   1,218,279      
Equity securities, Cost or Amortized Cost 229,153   211,848      
Equity securities, Estimated Fair Value 225,967   264,945      
Other invested assets 107,070   87,911      
Cost or Amortized Cost 1,490,726   1,487,616      
Gross Unrealized Gains 27,650   91,784      
Gross Unrealized Losses (145,339)   (7,574)      
Estimated Fair Value $ 1,372,139   $ 1,571,135      
Number of securities in an unrealized loss position | security 1,274   444      
Residential mortgage backed securities, fair value $ 41,194          
U.S. Treasury securities            
Marketable Securities            
Fixed maturity securities, amortized cost 1,826   $ 318      
Fixed maturity securities, Gross Unrealized Gains     6      
Fixed maturity securities, Gross Unrealized Losses (169)          
Fixed maturity securities, Estimated Fair Value 1,657   324      
Obligations of states and political subdivisions            
Marketable Securities            
Fixed maturity securities, amortized cost 70,753   111,578      
Fixed maturity securities, Gross Unrealized Gains 251   4,847      
Fixed maturity securities, Gross Unrealized Losses (4,242)   (123)      
Fixed maturity securities, Estimated Fair Value 66,762   116,302      
Residential mortgage-backed securities            
Marketable Securities            
Fixed maturity securities, amortized cost 249,892   237,026      
Fixed maturity securities, Gross Unrealized Gains 133   5,941      
Fixed maturity securities, Gross Unrealized Losses (29,290)   (1,503)      
Fixed maturity securities, Estimated Fair Value 220,735   241,464      
Commercial mortgage-backed securities            
Marketable Securities            
Fixed maturity securities, amortized cost 151,852   146,318      
Fixed maturity securities, Gross Unrealized Gains     5,007      
Fixed maturity securities, Gross Unrealized Losses (15,114)   (442)      
Fixed maturity securities, Estimated Fair Value 136,738   150,883      
Other asset-backed securities            
Marketable Securities            
Fixed maturity securities, amortized cost 74,623   83,376      
Fixed maturity securities, Gross Unrealized Gains     475      
Fixed maturity securities, Gross Unrealized Losses (5,148)   (255)      
Fixed maturity securities, Estimated Fair Value 69,475   83,596      
Corporate and other securities            
Marketable Securities            
Fixed maturity securities, amortized cost 605,557   609,241      
Fixed maturity securities, allowance for expected credit losses (898) $ (691) (691) $ (729) $ (680) $ (1,054)
Fixed maturity securities, Gross Unrealized Gains 202   20,647      
Fixed maturity securities, Gross Unrealized Losses (61,126)   (3,487)      
Fixed maturity securities, Estimated Fair Value 543,735   625,710      
Equity securities            
Marketable Securities            
Equity securities, Cost or Amortized Cost 229,153   211,848      
Equity securities, Estimated Fair Value 225,967   264,945      
Equity securities, Gross Unrealized Gains 27,064   54,861      
Equity securities, Gross Unrealized Losses (30,250)   (1,764)      
Other invested assets            
Marketable Securities            
Other invested assets 107,070   87,911      
Other invested assets, Estimated Fair Value $ 107,070   $ 87,911