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Other Income (Expense) (Tables)
 12 Months Ended
Dec. 31, 2020
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,
  
 
  
2020
    
2019
    
2018
  
 
                  
Foreign exchange gain (loss)
  
$
(4,095
)
  
$
(1,414
)
  
$
(1,991
)
Interest income
    
3,709
      
8,445
      
11,940
  
Other components of periodic pension expense
    
(13,613
)
    
(13,959
)
    
(13,118
)
Investment income (expense)
    
2,271
      
6,448
      
(1,646
)
Other
    
(26
)
    
61
      
(266
)
 
  
$
(11,754
)
  
$
(419
)
  
$
(5,081
)