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Other Income (Expense) (Tables)
 12 Months Ended
Dec. 31, 2016
Other Income (Expense) [Abstract]  
Summary of other Income (expense)
The caption "Other" on the consolidated statements of operations consists of the following:

 
 
Years ended December 31,
 
 
 
2016
  
2015
  
2014
 
 
         
Foreign exchange gain (loss)
 
$
292
  
$
3,180
  
$
(1,115
)
Interest income
  
4,264
   
4,397
   
4,939
 
Other
  
160
   
399
   
(1,335
)
 
 
$
4,716
  
$
7,976
  
$
2,489