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Net Investment Income
 9 Months Ended
Sep. 30, 2018
Net Investment Income [Abstract]  
Net Investment Income
Net Investment Income
Net investment income consists of the following: 
 
For the Three Months
Ended September 30,
 
For the Nine Months
Ended September 30,
 
 
(In thousands)
2018
 
2017
 
2018
 
2017
Investment income earned on:
 
 
 
 
 
 
 
Fixed maturity securities, including cash and cash equivalents and loans receivable
$
131,836

 
$
118,834

 
$
384,748

 
$
347,976

Investment funds
41,005

 
15,200

 
94,075

 
50,744

Arbitrage trading account
7,632

 
4,418

 
21,156

 
16,235

Real estate
5,597

 
5,042

 
15,339

 
14,894

Equity securities
1,004

 
604

 
2,208

 
1,845

Gross investment income
187,074

 
144,098

 
517,526

 
431,694

Investment expense
(950
)
 
(1,619
)
 
(3,107
)
 
(5,093
)
Net investment income
$
186,124

 
$
142,479

 
$
514,419

 
$
426,601