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Net Investment Income (Tables)
 9 Months Ended
Sep. 30, 2013
Net Investment Income [Abstract]  
Schedule of Net Investment Income
Net investment income consists of the following: 
 
For the Three Months Ended
 
For the Nine Months Ended
 
September 30,
 
September 30,
(In thousands)
2013
 
2012
 
2013
 
2012
Investment income earned on:
 
 
 
 
 
 
 
Fixed maturity securities, including cash and cash equivalents and loans receivable
$
104,033

 
$
121,454

 
$
333,072

 
$
360,577

Investment funds
5,492

 
(13,118
)
 
45,248

 
50,124

Arbitrage trading account
11,738

 
2,397

 
14,265

 
8,938

Equity securities available for sale
3,192

 
4,001

 
9,073

 
10,980

Real estate
3,086

 
3,097

 
9,343

 
8,621

Gross investment income
127,541

 
117,831

 
411,001

 
439,240

Investment expense
(1,907
)
 
(1,812
)
 
(5,701
)
 
(4,352
)
Net investment income
$
125,634

 
$
116,019

 
$
405,300

 
$
434,888