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Schedule I - Summary of Investments-Other Than Investments in Related Parties
 12 Months Ended
Dec. 31, 2022
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, 2022
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
$1,416,257 $1,273,844 $1,273,844 
States, municipalities and political subdivisions661,934 602,690 602,690 
Residential and commercial mortgage securities577,915 511,824 511,824 
Asset-backed securities660,345 624,561 624,561 
Foreign government and agency securities69,651 62,399 62,399 
All other corporate bonds1,546,472 1,414,280 1,414,280 
Total fixed maturities4,932,574 4,489,598 4,489,598 
Short-term investments252,282 252,027 252,027 
Other invested assets257,941 257,941 257,941 
Total investments$5,442,797 $4,999,566 $4,999,566