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Net Investment Income Net Investment Income
 6 Months Ended
Jun. 30, 2014
Income Statement [Abstract]  
Net Investment Income
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)
2014
 
2013
 
2014
 
2013
Investment income earned on:
 
 
 
 
 
 
 
Fixed maturity securities, including cash and cash equivalents and loans receivable
$
107,760

 
$
111,203

 
$
214,658

 
$
229,039

Investment funds
22,356

 
22,576

 
76,155

 
33,510

Arbitrage trading account
6,942

 
4,990

 
12,461

 
8,773

Equity securities available for sale
2,103

 
3,634

 
4,049

 
5,881

Real estate
3,063

 
3,116

 
6,165

 
6,257

Gross investment income
142,224

 
145,519

 
313,488

 
283,460

Investment expense
(3,495
)
 
(1,782
)
 
(6,048
)
 
(3,794
)
Net investment income
$
138,729

 
$
143,737

 
$
307,440

 
$
279,666