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Fair Value Option (Tables)
 9 Months Ended
Sep. 30, 2013
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,
 
2013
 
2012
 
2013
 
2012
 
(Amounts in thousands)
Fixed maturity securities
$
(11,295
)
 
$
19,198

 
$
(81,268
)
 
$
50,013

Equity securities
32,602

 
25,629

 
67,625

 
20,153

Short-term investments
508

 
(44
)
 
199

 
(828
)
Total
$
21,815

 
$
44,783

 
$
(13,444
)
 
$
69,338