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Shareholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2019
Shareholders' Equity [Abstract]  
Changes in Accumulated Other Comprehensive Income (Loss) by Component
The following table illustrates changes in accumulated other comprehensive income 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 income before reclassifications
  
307
   
7,671
   
7,978
 
Amounts reclassified from accumulated other comprehensive income (loss)
  
–
   
785
   
785
 
             
Net current-period other comprehensive income
  
307
   
8,456
   
8,763
 
             
Ending balance at March 31, 2019
 
$
(832
)
 
$
2,248
  
$
1,416
 


The following table illustrates changes in accumulated other comprehensive income (loss) by component for the three months ended March 31, 2018:

  
Foreign
Currency
  
Unrealized Holding Gains (Losses) on
Available-for-sale Securities
  
Total
 
Beginning balance at December 31, 2017
 
$
(309
)
 
$
46,700
  
$
46,391
 
             
Cumulative effect of adoption of ASU 2016-01, net of tax
  
–
   
(46,157
)
  
(46,157
)
             
Balance at January 1, 2018
  
(309
)
  
543
   
234
 
             
Cumulative effect of adoption of ASU 2018-02
  
–
   
117
   
117
 
Other comprehensive loss before reclassifications
  
(223
)
  
(2,998
)
  
(3,221
)
Amounts reclassified from accumulated other comprehensive income (loss)
  
–
   
(123
)
  
(123
)
             
Net current-period other comprehensive loss
  
(223
)
  
(3,121
)
  
(3,344
)
             
Ending balance at March 31, 2018
 
$
(532
)
 
$
(2,461
)
 
$
(2,993
)