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Net Investment Income (Tables)
 6 Months Ended
Jun. 30, 2019
Net Investment Income [Abstract]  
Schedule of Net Investment Income
Net investment income consists of the following: 
 
For the Three Months
Ended June 30,
 
For the Six Months
Ended June 30,
 
 
(In thousands)
2019
 
2018
 
2019
 
2018
Investment income earned on:
 
 
 
 
 
 
 
Fixed maturity securities, including cash and cash equivalents and loans receivable
$
128,903

 
$
129,665

 
$
261,022

 
$
252,911

Investment funds
46,840

 
12,716

 
58,251

 
53,070

Arbitrage trading account
7,199

 
8,333

 
17,784

 
13,524

Real estate
5,174

 
3,174

 
9,481

 
9,742

Equity securities
1,303

 
559

 
2,591

 
1,205

Gross investment income
189,419

 
154,447

 
349,129

 
330,452

Investment expense
(1,086
)
 
(670
)
 
(2,542
)
 
(2,157
)
Net investment income
$
188,333

 
$
153,777

 
$
346,587

 
$
328,295