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5. Financial risk management (Details 2) € in Thousands, kr in Thousands, SFr in Thousands, $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 ARS ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 EUR (€) | Dec. 31, 2018 CHF (SFr) | Dec. 31, 2018 NOK (kr) | Dec. 31, 2017 ARS ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 EUR (€) | Dec. 31, 2017 CHF (SFr) | Dec. 31, 2017 NOK (kr)
SummaryOfFinancialRiskManagementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |
Decrease in the results of operations for the year | $ (472,434) |  |  |  |  | $ (486,910) |  |  |  |
US dollar |  |  |  |  |  |  |  |  |  |
SummaryOfFinancialRiskManagementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |
Decrease in the results of operations for the year |  | $ (472,003) |  |  |  |  | $ (484,454) |  |  |
Euro |  |  |  |  |  |  |  |  |  |
SummaryOfFinancialRiskManagementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |
Decrease in the results of operations for the year | € |  |  | € (401) |  |  |  |  | € (886) |  |
Norwegian krone |  |  |  |  |  |  |  |  |  |
SummaryOfFinancialRiskManagementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |
Decrease in the results of operations for the year | kr |  |  |  |  | kr (30) |  |  |  |  | kr (24)
Swiss franc |  |  |  |  |  |  |  |  |  |
SummaryOfFinancialRiskManagementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |
Decrease in the results of operations for the year | SFr |  |  |  | SFr 0 |  |  |  |  | SFr (1,546) |

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