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Investments (Tables)
6 Months Ended
Jun. 30, 2016
Investments, Debt and Equity Securities [Abstract]  
Summary of Available-for-Sale Securities
Available-for-sale securities consisted of the following: 
 
Adjusted Cost
 
Gross Unrealized
Gain (Loss)
 
Fair Value
June 30, 2016
 
 
 
 
 
 
 
 
Registered investment companies
$
3,090

 
$
282

 
$
3,372

December 31, 2015
 
 
 
 
 
 
 
 
Registered investment companies
$
3,622

 
$
(46
)
 
$
3,576