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Accumulated Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2017
Accumulated Other Comprehensive Income [Abstract]  
Changes in accumulated other comprehensive income by component
The following table illustrates changes in accumulated other comprehensive income by component for the three months ended March 31, 2017:


     
Unrealized
    
     
holding gains on
    
  
Foreign
  
available-for-sale
    
  
Currency
  
securities
  
Total
 
          
Beginning balance
 
$
(831
)
 
$
34,051
  
$
33,220
 
             
   Other comprehensive income
            
      before reclassifications
  
65
   
5,990
   
6,055
 
             
   Amounts reclassified from
            
      accumulated other
            
      comprehensive income
  
-
   
(655
)
  
(655
)
             
Net current-period other
            
   comprehensive income
  
65
   
5,335
   
5,400
 
             
Ending balance
 
$
(766
)
 
$
39,386
  
$
38,620