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Schedule I - Summary of Investments-Other Than Investments in Related Parties
 12 Months Ended
Dec. 31, 2024
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, 2024
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
$1,704,937 $1,566,307 $1,566,307 
States, municipalities and political subdivisions631,015 583,501 583,501 
Residential and commercial mortgage securities519,613 478,086 478,086 
Asset-backed securities642,395 631,959 631,959 
Foreign government and agency securities81,631 69,798 69,798 
All other corporate bonds1,887,647 1,783,046 1,783,046 
Total fixed maturities5,467,238 5,112,697 5,112,697 
Short-term investments763,780 764,024 764,024 
Other invested assets303,900 303,900 303,900 
Total investments$6,534,918 $6,180,621 $6,180,621