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Investments (Tables)
 9 Months Ended
Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Value of Marketable Investments
The value of marketable investments were as follows (in thousands):
December 31, 2017
Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Carrying Value
Debt securities: corporate bonds
$
700

 
$
6

 
$
(22
)
 
$
684

Marketable equity securities
513

 
710

 
(5
)
 
1,218

Total
$
1,213

 
$
716

 
$
(27
)
 
$
1,902