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Investments (Tables)
3 Months Ended
Mar. 31, 2014
Investments, Debt and Equity Securities [Abstract]  
Summary of Available-for-Sale Securities
Available-for-sale securities consisted of the following: 
 
Adjusted
Cost
 
Gross
Unrealized
Loss
 
Fair Value
March 31, 2014
 
 
 
 
 
 
 
 
Registered investment companies
$
4,077

 
$
(159
)
 
$
3,918

December 31, 2013
 
 
 
 
 
 
 
 
Registered investment companies
$
4,098

 
$
(187
)
 
$
3,911