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Shareholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2019
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, 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
  
402
   
16,588
   
16,990
 
Amounts reclassified from accumulated other comprehensive income (loss)
  
–
   
(49
)
  
(49
)
             
Net current-period other comprehensive income
  
402
   
16,539
   
16,941
 
             
Ending balance at September 30, 2019
 
$
(737
)
 
$
10,331
  
$
9,594
 

The following table illustrates changes in accumulated other comprehensive income (loss) by component for the nine months ended September 30, 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
  
(209
)
  
(4,815
)
  
(5,024
)
Amounts reclassified from accumulated other comprehensive income (loss)
  
–
   
(1,483
)
  
(1,483
)
             
Net current-period other comprehensive loss
  
(209
)
  
(6,298
)
  
(6,507
)
             
Ending balance at September 30, 2018
 
$
(518
)
 
$
(5,638
)
 
$
(6,156
)