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Financial instruments (Details 24) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financial instruments [Line Items] |  |
Trade And Other Current Payables To Trade Suppliers Past Due | $ 18,098 | $ 41,329
Goods [Member] |  |
Financial instruments [Line Items] |  |
Trade And Other Current Payables To Trade Suppliers Past Due | 2,669 | 24,534
Services [Member] |  |
Financial instruments [Line Items] |  |
Trade And Other Current Payables To Trade Suppliers Past Due | 13,737 | 16,187
Others [Member] |  |
Financial instruments [Line Items] |  |
Trade And Other Current Payables To Trade Suppliers Past Due | 1,692 | 608
Up to 30 days [member] |  |
Financial instruments [Line Items] |  |
Trade And Other Current Payables To Trade Suppliers Past Due | 14,801 | 28,876
Up to 30 days [member] | Goods [Member] |  |
Financial instruments [Line Items] |  |
Trade And Other Current Payables To Trade Suppliers Past Due | 1,533 | 16,693
Up to 30 days [member] | Services [Member] |  |
Financial instruments [Line Items] |  |
Trade And Other Current Payables To Trade Suppliers Past Due | 12,229 | 11,704
Up to 30 days [member] | Others [Member] |  |
Financial instruments [Line Items] |  |
Trade And Other Current Payables To Trade Suppliers Past Due | 1,039 | 479
31 - 60 days [member] |  |
Financial instruments [Line Items] |  |
Trade And Other Current Payables To Trade Suppliers Past Due | 1,432 | 2,370
31 - 60 days [member] | Goods [Member] |  |
Financial instruments [Line Items] |  |
Trade And Other Current Payables To Trade Suppliers Past Due | 209 | 448
31 - 60 days [member] | Services [Member] |  |
Financial instruments [Line Items] |  |
Trade And Other Current Payables To Trade Suppliers Past Due | 838 | 1,913
31 - 60 days [member] | Others [Member] |  |
Financial instruments [Line Items] |  |
Trade And Other Current Payables To Trade Suppliers Past Due | 385 | 9
61 - 90 days [member] |  |
Financial instruments [Line Items] |  |
Trade And Other Current Payables To Trade Suppliers Past Due | 411 | 4,525
61 - 90 days [member] | Goods [Member] |  |
Financial instruments [Line Items] |  |
Trade And Other Current Payables To Trade Suppliers Past Due | 210 | 3,965
61 - 90 days [member] | Services [Member] |  |
Financial instruments [Line Items] |  |
Trade And Other Current Payables To Trade Suppliers Past Due | 109 | 547
61 - 90 days [member] | Others [Member] |  |
Financial instruments [Line Items] |  |
Trade And Other Current Payables To Trade Suppliers Past Due | 92 | 13
91 - 120 days [member] |  |
Financial instruments [Line Items] |  |
Trade And Other Current Payables To Trade Suppliers Past Due | 372 | 2,485
91 - 120 days [member] | Goods [Member] |  |
Financial instruments [Line Items] |  |
Trade And Other Current Payables To Trade Suppliers Past Due | 255 | 1,784
91 - 120 days [member] | Services [Member] |  |
Financial instruments [Line Items] |  |
Trade And Other Current Payables To Trade Suppliers Past Due | 111 | 681
91 - 120 days [member] | Others [Member] |  |
Financial instruments [Line Items] |  |
Trade And Other Current Payables To Trade Suppliers Past Due | 6 | 20
121 - 365 days [member] |  |
Financial instruments [Line Items] |  |
Trade And Other Current Payables To Trade Suppliers Past Due | 544 | 2,973
121 - 365 days [member] | Goods [Member] |  |
Financial instruments [Line Items] |  |
Trade And Other Current Payables To Trade Suppliers Past Due | 175 | 1,602
121 - 365 days [member] | Services [Member] |  |
Financial instruments [Line Items] |  |
Trade And Other Current Payables To Trade Suppliers Past Due | 309 | 1,325
121 - 365 days [member] | Others [Member] |  |
Financial instruments [Line Items] |  |
Trade And Other Current Payables To Trade Suppliers Past Due | 60 | 46
366 and more days [member] |  |
Financial instruments [Line Items] |  |
Trade And Other Current Payables To Trade Suppliers Past Due | 538 | 100
366 and more days [member] | Goods [Member] |  |
Financial instruments [Line Items] |  |
Trade And Other Current Payables To Trade Suppliers Past Due | 287 | 42
366 and more days [member] | Services [Member] |  |
Financial instruments [Line Items] |  |
Trade And Other Current Payables To Trade Suppliers Past Due | 141 | 17
366 and more days [member] | Others [Member] |  |
Financial instruments [Line Items] |  |
Trade And Other Current Payables To Trade Suppliers Past Due | $ 110 | $ 41

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