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Other Income (Expense) (Tables)
 12 Months Ended
Dec. 31, 2017
Other Income (Expense) [Abstract]  
Summary of other Income (expense)
The caption "Other" on the accompanying consolidated statements of operations consists of the following:

 
 
Years ended December 31,
 
 
 
2017
  
2016
  
2015
 
 
         
Foreign exchange gain (loss)
 
$
(4,536
)
 
$
292
  
$
3,180
 
Interest income
  
6,482
   
4,264
   
4,397
 
Other
  
(208
)
  
160
   
399
 
 
 
$
1,738
  
$
4,716
  
$
7,976