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Other Income (Expense), Net (Tables)
 12 Months Ended
Dec. 31, 2016
Other Income and Expenses [Abstract]  
Components of Other Income

The major changes in the components of Other income (expense), net for the years ended December 31 were as follows (in thousands):

     2016      2015      2014  

Rental income

    $ 462      $ —      $ —  

Foreign currency losses, net

      (268 )       (161 )       (196 ) 

Interest income

      68        47        80  

Credit gains on available for sale securities

      13        12        311  

(Loss) gain on disposal of equipment

      (4 )       60        22  

Other

      13        67        51  
  

 

 

     

 

 

     

 

 

  
   $ 284      $ 25      $ 268