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Summary of significant accounting policies - Restatement of financial results (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |  |
Interest income | $ (4,084) | $ (6,390) |  | $ (7,728) |
Finance income | (26,054) | (8,979) | [1] | (8,394) | [1]
Interest expense | (58,282) | (56,468) |  | (47,266) |
Cash flow hedge - transfer from equity | 90,689 | 76,303 | [2] |  |
Foreign exchange losses, net | (109,266) | (25,779) |  | (68,787) |
Finance costs | 213,776 | 126,111 | [1] | 163,937 | [1]
Other financial results - Net gain of inflation effects on the monetary items | 12,064 | 16,911 | [1],[3] | (25,211) | [1],[3]
Total financial results, net | $ (175,658) | (100,221) | [1] | (180,754) | [1]
Previously stated |  |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |  |
Interest income |  | (7,319) |  | (7,915) |
Finance income |  | (9,908) |  | (8,581) |
Interest expense |  | (60,134) |  | (51,577) |
Foreign exchange losses, net |  | (108,458) |  | (183,195) |
Finance costs |  | 202,566 |  | 271,263 |
Other financial results - Net gain of inflation effects on the monetary items |  | 92,437 |  | 81,928 |
Total financial results, net |  | (100,221) |  | (180,754) |
Increase / (Decrease) |  |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |  |
Interest income |  | (929) |  | (187) |
Finance income |  | (929) |  | (187) |
Interest expense |  | (3,666) |  | (4,311) |
Foreign exchange losses, net |  | 82,679 |  | 114,408 |
Finance costs |  | (76,455) |  | (107,326) |
Other financial results - Net gain of inflation effects on the monetary items |  | (75,526) |  | (107,139) |
Total financial results, net |  | $ 0 |  | $ 0 |
[1] | Prior periods have been recast to reflect the Company's change in accounting policy for the reclassification within financial results as explained in Note 34.1.
[2] | Prior periods have been recast to reflect the Company's change in accounting policy for the reclassification within shareholders equity of the initial application of IAS 29 as explained in Note 34.1.
[3] | Prior periods have been recast to reflect the Company's change in accounting policy for the reclassification within financial results as explained in Note 34.1

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