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Other Income (Expense) (Tables)
 12 Months Ended
Dec. 31, 2018
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,
 
 
 
2018
  
2017
  
2016
 
 
         
Foreign exchange gain (loss)
 
$
(1,991
)
 
$
(4,536
)
 
$
292
 
Interest income
  
11,940
   
6,482
   
4,264
 
Investment income (expense)†
  
(1,646
)
  
-
   
-
 
Other
  
(266
)
  
(208
)
  
160
 
 
 
$
8,037
  
$
1,738
  
$
4,716
 

† Recognized in "Other" subsequent to the prospective adoption of ASU 2016-01.  Previously recorded in accumulated other comprehensive income until realized.  See Note 1.