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Financial instruments (Details 23) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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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

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