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Equity - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
IFRS Statement [Line Items]        
Par value per share $ 0.3 $ 0.3    
Number of shares authorised 1,000,000,000 1,000,000,000    
Number of shares issued 356,699,482 356,699,482    
Accumulated Legal and special reserve $ 79,931 $ 78,901    
Proportion of ownership interest in associate 100.00%      
Percentage Of Annual Net Income Set Aside As Legal Reserve 10.00%      
Issued capital [member]        
IFRS Statement [Line Items]        
Par value per share $ 0.3 $ 0.3    
Number of shares outstanding 344,368,062 344,290,306    
Treasury shares [member]        
IFRS Statement [Line Items]        
Number of shares outstanding (12,332,000) (12,409,000) (12,492,000) (12,693,000)