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Net Investment Income (Tables)
3 Months Ended
Mar. 31, 2025
Net Investment Income [Abstract]  
Schedule of Net Investment Income Net investment income consisted of the following: 
 For the Three Months
Ended March 31,
(In thousands)20252024
Investment income (loss) earned on:
Fixed maturity securities, including cash and cash equivalents and loans receivable$313,788 $335,248 
Investment funds27,023 (29,349)
Arbitrage trading account (1)16,329 18,011 
Equity securities10,641 11,336 
Real estate(4,017)(13,163)
Gross investment income363,764 322,083 
Investment expense(3,472)(2,244)
Net investment income$360,292 $319,839 
(1) Net investment income includes earnings from trading account receivables from brokers and clearing organizations.