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Short-term Investments (Tables)
6 Months Ended
Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract]  
Schedule of Short-term Investments
Amortized cost represents the fair value at the date of acquisition as determined by the publicly traded quoted market value per share less a discount for lack of marketability.
 
June 30, 2015
 
Amortized
Cost
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
Equity securities, available for sale
$
10,614

 
$
(1,552
)
 
$
9,062