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Net Investment Income (Tables)
 9 Months Ended
Sep. 30, 2020
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)2020201920202019
Investment income earned on:
Fixed maturity securities, including cash and cash equivalents and loans receivable$97,080 $125,957 $330,941 $386,978 
Investment funds18,235 19,033 1,260 77,284 
Arbitrage trading account19,543 8,400 51,985 26,184 
Real estate
7,666 7,987 18,807 17,468 
Equity securities
1,907 1,392 6,194 3,984 
Gross investment income144,430 162,769 409,187 511,898 
Investment expense(1,780)(1,077)(6,343)(3,619)
Net investment income$142,650 $161,692 $402,844 $508,279