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Financial instruments (Details 23) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Financial instruments [Line Items]    
Trade And Other Current Payables To Trade Suppliers Current Period $ 145,275 $ 154,529
Up to 30 days [member]    
Financial instruments [Line Items]    
Trade And Other Current Payables To Trade Suppliers Current Period 141,323 154,526
31 - 60 days [member]    
Financial instruments [Line Items]    
Trade And Other Current Payables To Trade Suppliers Current Period 2,394 0
61 - 90 days [member]    
Financial instruments [Line Items]    
Trade And Other Current Payables To Trade Suppliers Current Period 1,089 0
91 - 120 days [member]    
Financial instruments [Line Items]    
Trade And Other Current Payables To Trade Suppliers Current Period 132 0
121 - 365 days [member]    
Financial instruments [Line Items]    
Trade And Other Current Payables To Trade Suppliers Current Period 297 0
366 and more days [member]    
Financial instruments [Line Items]    
Trade And Other Current Payables To Trade Suppliers Current Period 40 3
Goods [Member]    
Financial instruments [Line Items]    
Trade And Other Current Payables To Trade Suppliers Current Period 52,105 72,567
Goods [Member] | Up to 30 days [member]    
Financial instruments [Line Items]    
Trade And Other Current Payables To Trade Suppliers Current Period 48,969 72,567
Goods [Member] | 31 - 60 days [member]    
Financial instruments [Line Items]    
Trade And Other Current Payables To Trade Suppliers Current Period 1,919 0
Goods [Member] | 61 - 90 days [member]    
Financial instruments [Line Items]    
Trade And Other Current Payables To Trade Suppliers Current Period 912 0
Goods [Member] | 91 - 120 days [member]    
Financial instruments [Line Items]    
Trade And Other Current Payables To Trade Suppliers Current Period 25 0
Goods [Member] | 121 - 365 days [member]    
Financial instruments [Line Items]    
Trade And Other Current Payables To Trade Suppliers Current Period 278 0
Goods [Member] | 366 and more days [member]    
Financial instruments [Line Items]    
Trade And Other Current Payables To Trade Suppliers Current Period 2 0
Services [Member]    
Financial instruments [Line Items]    
Trade And Other Current Payables To Trade Suppliers Current Period 38,008 36,858
Services [Member] | Up to 30 days [member]    
Financial instruments [Line Items]    
Trade And Other Current Payables To Trade Suppliers Current Period 37,376 36,855
Services [Member] | 31 - 60 days [member]    
Financial instruments [Line Items]    
Trade And Other Current Payables To Trade Suppliers Current Period 314 0
Services [Member] | 61 - 90 days [member]    
Financial instruments [Line Items]    
Trade And Other Current Payables To Trade Suppliers Current Period 157 0
Services [Member] | 91 - 120 days [member]    
Financial instruments [Line Items]    
Trade And Other Current Payables To Trade Suppliers Current Period 107 0
Services [Member] | 121 - 365 days [member]    
Financial instruments [Line Items]    
Trade And Other Current Payables To Trade Suppliers Current Period 19 0
Services [Member] | 366 and more days [member]    
Financial instruments [Line Items]    
Trade And Other Current Payables To Trade Suppliers Current Period 35 3
Others [Member]    
Financial instruments [Line Items]    
Trade And Other Current Payables To Trade Suppliers Current Period 55,162 45,104
Others [Member] | Up to 30 days [member]    
Financial instruments [Line Items]    
Trade And Other Current Payables To Trade Suppliers Current Period 54,978 45,104
Others [Member] | 31 - 60 days [member]    
Financial instruments [Line Items]    
Trade And Other Current Payables To Trade Suppliers Current Period 161 0
Others [Member] | 61 - 90 days [member]    
Financial instruments [Line Items]    
Trade And Other Current Payables To Trade Suppliers Current Period 20 0
Others [Member] | 91 - 120 days [member]    
Financial instruments [Line Items]    
Trade And Other Current Payables To Trade Suppliers Current Period 0 0
Others [Member] | 121 - 365 days [member]    
Financial instruments [Line Items]    
Trade And Other Current Payables To Trade Suppliers Current Period 0 0
Others [Member] | 366 and more days [member]    
Financial instruments [Line Items]    
Trade And Other Current Payables To Trade Suppliers Current Period $ 3 $ 0