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Shareholders' Equity (Tables)
 3 Months Ended
Mar. 31, 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 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
)

The following table illustrates changes in accumulated other comprehensive income (loss) by component for the three months ended March 31, 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 loss before reclassifications
  
307
   
7,671
   
7,978
 
Amounts reclassified from accumulated other comprehensive income (loss)
  
–
   
785
   
785
 
             
Net current-period other comprehensive income (loss)
  
307
   
8,456
   
8,763
 
             
Ending balance at March 31, 2019
 
$
(832
)
 
$
2,248
  
$
1,416