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Basis of presentation for the consolidated financial statements (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Disclosure Of Basis Of Presentation For Consolidated Financial Statement [Line Items]        
Trade and other receivables, current $ 399,142 $ 466,619    
Trade receivables due from related parties, current 61,227 42,790   $ 61,227
Other non-financial assets, current 50,552 47,972    
Intangible assets other than goodwill 188,358 189,350    
Goodwill 34,726 34,866 $ 37,972  
Cost of sales (1,383,603) (1,485,631) (1,394,822)  
Finance costs $ (76,939) (57,807) $ (50,124)  
Balances originally reported [Member]        
Disclosure Of Basis Of Presentation For Consolidated Financial Statement [Line Items]        
Trade and other receivables, current   464,855    
Trade receivables due from related parties, current   44,554    
Other non-financial assets, current   49,186    
Intangible assets other than goodwill   188,283    
Goodwill   34,718    
Cost of sales   (1,483,524)    
Finance costs   (59,914)    
Reclassification balances [Member]        
Disclosure Of Basis Of Presentation For Consolidated Financial Statement [Line Items]        
Trade and other receivables, current   1,764    
Trade receivables due from related parties, current   (1,764)    
Other non-financial assets, current   (1,214)    
Intangible assets other than goodwill   1,067    
Goodwill   148    
Cost of sales   (2,107)    
Finance costs   2,107    
Reclassified balances [member]        
Disclosure Of Basis Of Presentation For Consolidated Financial Statement [Line Items]        
Trade and other receivables, current   466,619    
Trade receivables due from related parties, current   42,790    
Other non-financial assets, current   47,972    
Intangible assets other than goodwill   189,350    
Goodwill   34,866    
Cost of sales   (1,485,631)    
Finance costs   $ (57,807)