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Financial instruments (Details 5) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financial instruments [Abstract]      
Provision Impairment Accounts receivable at the beginning of the Period $ 34,936 $ 31,616  
Impairment loss (impairment gain and reversal of impairment loss) determined in accordance with IFRS 9 (2,967) 8,038 $ 7,198
Increase / (decrease) impairment of accounts receivable for the period to profit and loss (2,967) 8,037  
Use of Provision Applied to Accounts Receivable (1,636) (4,717)  
Impairment of Accounts Receivable Provision at the Star of the Period (1)+(2) 32,634 34,936 $ 31,616
Trade and Other Receivables Provision 21,668 20,811  
Current Related Party Receivables Provision 10,966 14,125  
Recovery of Insurance 827 126  
Impairment of Accounts Receivable Provision 32,634 34,936  
Renegotiated Provision 2,056 2,580  
Non-renegotiated Provision $ 30,578 $ 32,356