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Schedule I. Summary of Investments - Other than Investments in Related Parties
 12 Months Ended
Dec. 31, 2025
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, 2025(In thousands)
Cost or Amortized CostAmounts at Which Shown in Balance Sheet
Type of InvestmentFair Value
Fixed maturities   
United States Government and government agencies and authorities$109,358 $104,104 $104,104 
States, municipalities and political subdivisions261,711 261,734 261,734 
Public utilities127,365 121,049 121,049 
All other bonds1,740,739 1,718,463 1,718,463 
Total fixed maturities$2,239,173 $2,205,350 $2,205,350 
Mortgage loans on real estate$31,116 $30,127 $30,830 
Other long-term investments228,507 228,507 228,507 
Total investments$2,498,796 $2,463,984 $2,464,687