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Net Investment Income (Tables)
3 Months Ended
Mar. 31, 2022
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)20222021
Investment income earned on:
Fixed maturity securities, including cash and cash equivalents and loans receivable$101,284 $94,677 
Investment funds52,012 38,935 
Arbitrage trading account9,187 19,074 
Equity securities10,856 6,180 
Real estate2,146 1,161 
Gross investment income175,485 160,027 
Investment expense(1,973)(1,450)
Net investment income$173,512 $158,577