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Basis for preparation, consolidation and accounting policies - Impact of Adoption of IFRIC 23 on consolidated statement of financial position (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Liabilities        
Current tax liabilities, current $ 3,162 $ 5,650    
Total liabilities 1,179,760 1,139,074 $ 1,187,656  
Shareholders' equity, net        
Retained earnings 1,503,785 1,639,658    
Total shareholders' equity, net $ 2,799,857 $ 2,968,200 $ 3,029,565 $ 3,063,627