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Investments (Details)
$ in Thousands
Jun. 30, 2020
USD ($)
security
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
security
Marketable Securities      
Fixed maturity securities, amortized cost $ 1,168,666   $ 1,192,357
Fixed maturity securities, allowance for expected credit losses (2,471) $ (2,510)  
Fixed maturity securities, Gross Unrealized Gains 61,527   38,321
Fixed maturity securities, Gross Unrealized Losses (8,008)   (2,638)
Fixed maturity securities, Estimated Fair Value 1,219,714   1,228,040
Equity securities, Cost or Amortized Cost 164,991   151,121
Equity securities, Estimated Fair Value 178,347   177,637
Other invested assets, Cost or Amortized Cost 35,526   37,278
Cost or Amortized Cost 1,369,183   1,380,756
Gross Unrealized Gains 80,740   66,200
Gross Unrealized Losses (13,865)   (4,001)
Estimated Fair Value $ 1,433,587   $ 1,442,955
Number of securities in an unrealized loss position | security 527   229
U.S. Treasury securities      
Marketable Securities      
Fixed maturity securities, amortized cost $ 1,822   $ 1,504
Fixed maturity securities, Gross Unrealized Gains 59   8
Fixed maturity securities, Estimated Fair Value 1,881   1,512
Obligations of states and political subdivisions      
Marketable Securities      
Fixed maturity securities, amortized cost 225,863   241,597
Fixed maturity securities, Gross Unrealized Gains 8,314   9,799
Fixed maturity securities, Gross Unrealized Losses (139)    
Fixed maturity securities, Estimated Fair Value 234,038   251,396
Residential mortgage-backed securities      
Marketable Securities      
Fixed maturity securities, amortized cost 272,484   301,503
Fixed maturity securities, Gross Unrealized Gains 14,131   6,608
Fixed maturity securities, Gross Unrealized Losses (28)   (909)
Fixed maturity securities, Estimated Fair Value 286,587   307,202
Commercial mortgage-backed securities      
Marketable Securities      
Fixed maturity securities, amortized cost 105,542   106,902
Fixed maturity securities, Gross Unrealized Gains 8,609   3,233
Fixed maturity securities, Gross Unrealized Losses     (397)
Fixed maturity securities, Estimated Fair Value 114,151   109,738
Other asset-backed securities      
Marketable Securities      
Fixed maturity securities, amortized cost 27,673   36,068
Fixed maturity securities, Gross Unrealized Gains 375   218
Fixed maturity securities, Gross Unrealized Losses (599)   (64)
Fixed maturity securities, Estimated Fair Value 27,449   36,222
Corporate and other securities      
Marketable Securities      
Fixed maturity securities, amortized cost 535,282   504,783
Fixed maturity securities, allowance for expected credit losses (2,471) $ (2,510)  
Fixed maturity securities, Gross Unrealized Gains 30,039   18,455
Fixed maturity securities, Gross Unrealized Losses (7,242)   (1,268)
Fixed maturity securities, Estimated Fair Value 555,608   521,970
Equity securities      
Marketable Securities      
Equity securities, Cost or Amortized Cost 164,991   151,121
Equity securities, Gross Unrealized Gains 19,213   27,879
Equity securities, Gross Unrealized Losses (5,857)   (1,363)
Equity securities, Estimated Fair Value 178,347   177,637
Other invested assets      
Marketable Securities      
Other invested assets, Cost or Amortized Cost 35,526   37,278
Other invested assets, Estimated Fair Value $ 35,526   $ 37,278