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Net Investment Income (Tables)
 9 Months Ended
Sep. 30, 2025
Net Investment Income [Abstract]  
Schedule of Net Investment Income Net investment income consisted of the following: 
 For the Three Months
Ended September 30,		For the Nine Months
Ended September 30,
(In thousands)2025202420252024
Investment income (loss) earned on:
Fixed maturity securities, including cash and cash equivalents and loans receivable$324,319 $295,272 $960,625 $954,655 
Arbitrage trading account (1)16,309 17,869 56,309 52,562 
Equity securities11,497 12,203 34,623 35,924 
Investment funds5,421 4,741 59,713 868 
Real estate(3,373)(3,711)(11,482)(20,579)
Gross investment income354,173 326,374 1,099,788 1,023,430 
Investment expense(2,935)(2,618)(8,955)(7,707)
Net investment income$351,238 $323,756 $1,090,833 $1,015,723 
(1) Net investment income includes earnings from trading account receivables from brokers and clearing organizations.