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Operating costs and expenses (Tables)
 12 Months Ended
Dec. 31, 2019
Analysis of income and expense [abstract]  
Summary of Operating Costs and Expenses
 
   
2017
   
2018
   
2019
 
   
NT$000
   
NT$000
   
NT$000
 
Change of finished goods and work in process
   31,977    —      —   
Raw materials and supplies used
   3,036,350    3,079,909    3,575,283 
Employee benefit expenses
   5,895,778    5,606,833    6,075,773 
Depreciation expenses
   2,899,278    3,376,579    3,731,914 
Others
   4,530,425    4,464,499    4,590,720 
  
 
 
   
 
 
   
 
 
 
Total operating costs and expenses
  
 
16,393,808
 
  
 
16,527,820
 
  
 
17,973,690
 
  
 
 
   
 
 
   
 
 
 
Employee benefit expenses
      
Salaries
   4,847,433    4,628,039    5,114,790 
Director’s remuneration
   27,276    18,456    26,266 
Labor and health insurance
   390,788    406,111    422,106 
Pension
   198,502    201,567    194,173 
Share-based payments
   123,021    41,043    822 
Other personnel expenses
   308,758    311,617    317,616 
  
 
 
   
 
 
   
 
 
 
  
 
5,895,778
 
  
 
5,606,833
 
  
 
6,075,773