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Fair Value Option (Tables)
 9 Months Ended
Sep. 30, 2012
Fair Value Option [Abstract]  
Gains And Losses Due To Changes In Fair Value Of Investments
The following table presents gains (losses) due to changes in fair value of investments that are measured at fair value pursuant to application of the fair value option:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2012
 
2011
 
2012
 
2011
 
(Amounts in thousands)
Fixed maturity securities
$
19,198

 
$
25,525

 
$
50,013

 
$
49,834

Equity securities
25,629

 
(87,009
)
 
20,153

 
(69,858
)
Short-term investments
(44
)
 
(2,828
)
 
(828
)
 
(2,854
)
Total
$
44,783

 
$
(64,312
)
 
$
69,338

 
$
(22,878
)