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Investments (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
item
Marketable Securities    
Fixed maturity securities, amortized cost $ 1,192,357 $ 1,175,413
Fixed maturity securities, Gross Unrealized Gains 38,321 8,782
Fixed maturity securities, Non-OTTI Gross Unrealized Losses (2,638) (22,333)
Fixed maturity securities, Estimated Fair Value 1,228,040 1,161,862
Equity securities, Cost or Amortized Cost 151,121 142,948
Equity securities, Estimated Fair Value 177,637 148,011
Other invested assets, Cost or Amortized Cost 37,278 23,481
Cost or Amortized Cost 1,380,756 1,341,842
Gross Unrealized Gains 66,200 24,201
Gross Non-OTTI Unrealized Losses (4,001) (32,689)
Estimated Fair Value $ 1,442,955 $ 1,333,354
Number of securities in an unrealized loss position | item 229 958
U.S. Treasury securities    
Marketable Securities    
Fixed maturity securities, amortized cost $ 1,504 $ 1,807
Fixed maturity securities, Gross Unrealized Gains 8  
Fixed maturity securities, Non-OTTI Gross Unrealized Losses   (30)
Fixed maturity securities, Estimated Fair Value 1,512 1,777
Obligations of states and political subdivisions    
Marketable Securities    
Fixed maturity securities, amortized cost 241,597 262,772
Fixed maturity securities, Gross Unrealized Gains 9,799 5,098
Fixed maturity securities, Non-OTTI Gross Unrealized Losses   (1,672)
Fixed maturity securities, Estimated Fair Value 251,396 266,198
Residential mortgage-backed securities    
Marketable Securities    
Fixed maturity securities, amortized cost 301,503 300,387
Fixed maturity securities, Gross Unrealized Gains 6,608 1,477
Fixed maturity securities, Non-OTTI Gross Unrealized Losses (909) (4,841)
Fixed maturity securities, Estimated Fair Value 307,202 297,023
Commercial mortgage-backed securities    
Marketable Securities    
Fixed maturity securities, amortized cost 106,902 60,897
Fixed maturity securities, Gross Unrealized Gains 3,233 337
Fixed maturity securities, Non-OTTI Gross Unrealized Losses (397) (898)
Fixed maturity securities, Estimated Fair Value 109,738 60,336
Other asset-backed securities    
Marketable Securities    
Fixed maturity securities, amortized cost 36,068 61,310
Fixed maturity securities, Gross Unrealized Gains 218 95
Fixed maturity securities, Non-OTTI Gross Unrealized Losses (64) (329)
Fixed maturity securities, Estimated Fair Value 36,222 61,076
Corporate and other securities    
Marketable Securities    
Fixed maturity securities, amortized cost 504,783 488,240
Fixed maturity securities, Gross Unrealized Gains 18,455 1,775
Fixed maturity securities, Non-OTTI Gross Unrealized Losses (1,268) (14,563)
Fixed maturity securities, Estimated Fair Value 521,970 475,452
Equity securities    
Marketable Securities    
Equity securities, Cost or Amortized Cost 151,121 142,948
Equity securities, Gross Unrealized Gains 27,879 15,419
Equity securities, Non-OTTI Gross Unrealized Losses (1,363) (10,356)
Equity securities, Estimated Fair Value 177,637 148,011
Other invested assets    
Marketable Securities    
Other invested assets, Cost or Amortized Cost 37,278 23,481
Other invested assets, Estimated Fair Value $ 37,278 $ 23,481