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Schedule I - Summary of Investments-Other Than Investments in Related Parties
 12 Months Ended
Dec. 31, 2023
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Abstract]  
Schedule I - Summary of Investments-Other Than Investments in Related Parties
Schedule I—Summary of Investments—Other Than Investments in Related Parties

December 31, 2023
Type of Investment
(In thousands)		Amortized
Cost		Fair
Value		Amount at which
shown in the
Balance Sheet
Fixed maturities:   
Bonds:   
United States Government and government agencies and authorities
$1,459,742 $1,340,313 $1,340,313 
States, municipalities and political subdivisions585,047 547,258 547,258 
Residential and commercial mortgage securities571,163 517,940 517,940 
Asset-backed securities584,168 564,995 564,995 
Foreign government and agency securities77,516 67,447 67,447 
All other corporate bonds1,380,533 1,297,055 1,297,055 
Total fixed maturities4,658,169 4,335,008 4,335,008 
Short-term investments928,561 928,731 928,731 
Other invested assets277,228 277,226 277,226 
Total investments$5,863,958 $5,540,965 $5,540,965