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Net Investment Income (Tables)
 9 Months Ended
Sep. 30, 2021
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)2021202020212020
Investment income earned on:
Fixed maturity securities, including cash and cash equivalents and loans receivable$93,031 $97,080 $284,704 $330,941 
Investment funds69,292 18,235 169,538 1,260 
Arbitrage trading account7,187 19,543 30,176 51,985 
Equity securities8,462 1,907 21,854 6,194 
Real estate3,485 7,666 5,517 18,807 
Gross investment income181,457 144,430 511,789 409,187 
Investment expense(1,606)(1,780)(5,174)(6,343)
Net investment income$179,851 $142,650 $506,615 $402,844