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Investments (Details)
$ in Thousands
Mar. 31, 2020
USD ($)
security
Dec. 31, 2019
USD ($)
security
Marketable Securities    
Fixed maturity securities, amortized cost $ 1,159,859 $ 1,192,357
Fixed maturity securities, allowance for expected credit losses (2,510)  
Fixed maturity securities, Gross Unrealized Gains 34,725 38,321
Fixed maturity securities, Gross Unrealized Losses (26,619) (2,638)
Fixed maturity securities, Estimated Fair Value 1,165,455 1,228,040
Equity securities, Cost or Amortized Cost 153,359 151,121
Equity securities, Estimated Fair Value 149,888 177,637
Other invested assets, Cost or Amortized Cost 41,881 37,278
Cost or Amortized Cost 1,355,099 1,380,756
Gross Unrealized Gains 48,599 66,200
Gross Unrealized Losses (43,964) (4,001)
Estimated Fair Value $ 1,357,224 $ 1,442,955
Number of securities in an unrealized loss position | security 733 229
U.S. Treasury securities    
Marketable Securities    
Fixed maturity securities, amortized cost $ 1,823 $ 1,504
Fixed maturity securities, Gross Unrealized Gains 60 8
Fixed maturity securities, Estimated Fair Value 1,883 1,512
Obligations of states and political subdivisions    
Marketable Securities    
Fixed maturity securities, amortized cost 224,800 241,597
Fixed maturity securities, Gross Unrealized Gains 8,924 9,799
Fixed maturity securities, Gross Unrealized Losses (34)  
Fixed maturity securities, Estimated Fair Value 233,690 251,396
Residential mortgage-backed securities    
Marketable Securities    
Fixed maturity securities, amortized cost 288,122 301,503
Fixed maturity securities, Gross Unrealized Gains 12,998 6,608
Fixed maturity securities, Gross Unrealized Losses (103) (909)
Fixed maturity securities, Estimated Fair Value 301,017 307,202
Commercial mortgage-backed securities    
Marketable Securities    
Fixed maturity securities, amortized cost 105,678 106,902
Fixed maturity securities, Gross Unrealized Gains 3,553 3,233
Fixed maturity securities, Gross Unrealized Losses (165) (397)
Fixed maturity securities, Estimated Fair Value 109,066 109,738
Other asset-backed securities    
Marketable Securities    
Fixed maturity securities, amortized cost 26,659 36,068
Fixed maturity securities, Gross Unrealized Gains 63 218
Fixed maturity securities, Gross Unrealized Losses (1,415) (64)
Fixed maturity securities, Estimated Fair Value 25,307 36,222
Corporate and other securities    
Marketable Securities    
Fixed maturity securities, amortized cost 512,777 504,783
Fixed maturity securities, allowance for expected credit losses (2,510) 0
Fixed maturity securities, Gross Unrealized Gains 9,127 18,455
Fixed maturity securities, Gross Unrealized Losses (24,902) (1,268)
Fixed maturity securities, Estimated Fair Value 494,492 521,970
Equity securities    
Marketable Securities    
Equity securities, Cost or Amortized Cost 153,359 151,121
Equity securities, Gross Unrealized Gains 13,874 27,879
Equity securities, Gross Unrealized Losses (17,345) (1,363)
Equity securities, Estimated Fair Value 149,888 177,637
Other invested assets    
Marketable Securities    
Other invested assets, Cost or Amortized Cost 41,881 37,278
Other invested assets, Estimated Fair Value $ 41,881 $ 37,278