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Net Investment Income (Tables)
 6 Months Ended
Jun. 30, 2016
Net Investment Income [Abstract]  
Schedule of Net Investment Income
Net investment income consists of the following: 
 
For the Three Months
 
For the Six Months
 
Ended June 30,
 
Ended June 30,
(In thousands)
2016
 
2015
 
2016
 
2015
Investment income (loss) earned on:
 
 
 
 
 
 
 
Fixed maturity securities, including cash and cash equivalents and loans receivable
$
108,342

 
$
105,030

 
$
217,177

 
$
213,159

Investment funds
18,456

 
21,851

 
35,092

 
27,912

Arbitrage trading account
3,252

 
(117
)
 
6,442

 
8,862

Equity securities available for sale
1,280

 
1,224

 
2,148

 
2,404

Real estate
1,250

 
2,114

 
3,967

 
4,881

Gross investment income
132,580

 
130,102

 
264,826

 
257,218

Investment expense
(3,531
)
 
(2,519
)
 
(5,644
)
 
(5,396
)
Net investment income
$
129,049

 
$
127,583

 
$
259,182

 
$
251,822