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Net Investment Income
6 Months Ended
Jun. 30, 2024
Net Investment Income [Abstract]  
Net Investment Income Net Investment Income
    Net investment income consisted of the following: 
 For the Three Months
Ended June 30,
For the Six Months
Ended June 30,
(In thousands)2024202320242023
Investment income (loss) earned on:
Fixed maturity securities, including cash and cash equivalents and loans receivable$324,136 $217,830 $659,384 $413,473 
Arbitrage trading account (1)16,682 17,037 34,693 35,293 
Equity securities12,386 15,254 23,721 29,000 
Investment funds25,476 (1,186)(3,873)993 
Real estate(3,705)(2,123)(16,868)(5,834)
Gross investment income374,975 246,812 697,057 472,925 
Investment expense(2,846)(1,660)(5,090)(4,374)
Net investment income$372,129 $245,152 $691,967 $468,551 
(1) Net investment income includes earnings from trading account receivables from brokers and clearing organizations.