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Shareholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2021
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 three months ended March 31, 2021:

  
Foreign
Currency
    
Unrealized Holding Gains (Losses) on
Available-for-sale Securities
    
Total
  
Beginning balance at December 31, 2020
  
$
(245
)
  
$
22,004
    
$
21,759
  
                         
Other comprehensive income (loss) before reclassifications
    
88
      
(8,580
)
    
(8,492
)
Amounts reclassified from accumulated other comprehensive income (loss)
    
–
      
(501
)
    
(501
)
                         
Net current-period other comprehensive income (loss)
    
88
      
(9,081
)
    
(8,993
)
                         
Ending balance at March 31, 2021
  
$
(157
)
  
$
12,923
    
$
12,766
  

The following table illustrates changes in accumulated other comprehensive income (loss) by component for the three months ended March 31, 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
    
(687
)
    
(20,256
)
    
(20,943
)
Amounts reclassified from accumulated other comprehensive income (loss)
    
–
      
(605
)
    
(605
)
                         
Net current-period other comprehensive income (loss)
    
(687
)
    
(20,861
)
    
(21,548
)
                         
Ending balance at March 31, 2020
  
$
(1,181
)
  
$
(10,998
)
  
$
(12,179
)