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Net Investment Income (Tables)
6 Months Ended
Jun. 30, 2022
Net Investment Income [Abstract]  
Schedule of 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)2022202120222021
Investment income (loss) earned on:
Fixed maturity securities, including cash and cash equivalents and loans receivable$124,389 $96,996 $225,673 $191,673 
Investment funds33,861 61,311 85,874 100,246 
Equity securities12,797 7,212 23,653 13,392 
Arbitrage trading account4,127 3,914 13,313 22,989 
Real estate(1,551)872 595 2,032 
Gross investment income173,623 170,305 349,108 330,332 
Investment expense(2,049)(2,118)(4,022)(3,568)
Net investment income$171,574 $168,187 $345,086 $326,764