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Treasury stock (Tables)
12 Months Ended
Dec. 31, 2019
Text block [abstract]  
Movement of Treasury Stock
As of December 31, 2017 and 2018, the reasons for share repurchases and movements in the number of the Company’s treasury stock are as follows:
   
2017
   
2018
 
   
Shares
   
Amount
   
Shares
  
Amount
 
   
in thousands
   
NT$000
   
in thousands
  
NT$000
 
January 1
   30,085    1,007,654    30,085   1,007,654 
Capital reduction
   —      —      (4,515  (45,151
  
 
 
   
 
 
   
 
 
  
 
 
 
December 31
  
 
30,085
 
  
 
1,007,654
 
  
 
25,570
 
 
 
962,503