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Short-term investments (Tables)
12 Months Ended
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]  
Current Trading Marketable Securities
Marketable securities at December 31, 2015 consist of (in thousands):

 
 
 
December 31, 2015
 
 
 
Cost
   
Unrealized
Gains
   
Estimated
Fair Value
 
Mutual funds
 
$
91
   
$
66
   
$
157