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Financial instruments (Details 5) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Financial instruments [Abstract]        
Allowance for doubtful accounts at the beginning of the Period $ 32,634 $ 34,936    
Adjustment to initial balance derived from the adoption of IFRS 9 1,057 (2,967) $ 8,038  
Increase / (decrease) of impairment provision 1,057 (2,967)    
Provision used (984) (1,636)    
Allowance for doubtful accounts at the end of the year 32,707 32,634 $ 34,936  
Trade and Other Receivables allowance current 16,192 14,756    
Other receivables allowance current 5,192 5,148    
Related party receivables allowance current 61,227 42,790   $ 61,227
Recovery of Insurance 320 827    
Impairment of Accounts Receivable Provision 32,707 32,634    
Renegotiated allowance 1,905 2,056    
Non-renegotiated allowance $ 30,802 $ 30,578