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Shareholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2020
Shareholders' Equity [Abstract]  
Changes in Accumulated Other Comprehensive Income (Loss) by Component
The following table illustrates changes in accumulated other comprehensive income (loss) by component for the nine months ended September 30, 2020:

  
Foreign
Currency
    
Unrealized Holding Gains (Losses) on
Available-for-sale Securities
    
Total
  
Beginning balance at December 31, 2019
  
$
(494
)
  
$
9,863
    
$
9,369
  
                         
Other comprehensive income (loss) before reclassifications
    
(307
)
    
4,678
      
4,371
  
Amounts reclassified from accumulated other comprehensive income (loss)
    
–
      
445
      
445
  
                         
Net current-period other comprehensive income (loss)
    
(307
)
    
5,123
      
4,816
  
                         
Ending balance at September 30, 2020
  
$
(801
)
  
$
14,986
    
$
14,185
  

The following table illustrates changes in accumulated other comprehensive income (loss) by component for the nine months ended September 30, 2019:

  
Foreign
Currency
    
Unrealized Holding Gains (Losses) on
Available-for-sale Securities
    
Total
  
Beginning balance at December 31, 2018
  
$
(1,139
)
  
$
(6,208
)
  
$
(7,347
)
                         
Other comprehensive income (loss) before reclassifications
    
402
      
16,588
      
16,990
  
Amounts reclassified from accumulated other comprehensive income (loss)
    
–
      
(49
)
    
(49
)
                         
Net current-period other comprehensive income (loss)
    
402
      
16,539
      
16,941
  
                         
Ending balance at September 30, 2019
  
$
(737
)
  
$
10,331
    
$
9,594