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Fair Value Option (Tables)
 6 Months Ended
Jun. 30, 2017
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 the application of the fair value option:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
 
 
 
 
 
 
 
 
 
(Amounts in thousands)
Fixed maturity securities
$
25,622

 
$
28,871

 
$
35,909

 
$
40,434

Equity securities
(5,080
)
 
8,666

 
6,462

 
15,573

Short-term investments
(267
)
 
(410
)
 
(240
)
 
(349
)
Total gains
$
20,275

 
$
37,127

 
$
42,131

 
$
55,658