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Basis of presentation for the consolidated financial statements (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019
Disclosure Of Basis Of Presentation For Consolidated Financial Statement [Line Items] |  |  |  |
Trade and other receivables, current | $ 399,142 | $ 466,619 |  |
Trade receivables due from related parties, current | 61,227 | 42,790 |  | $ 61,227
Other non-financial assets, current | 50,552 | 47,972 |  |
Intangible assets other than goodwill | 188,358 | 189,350 |  |
Goodwill | 34,726 | 34,866 | $ 37,972 |
Cost of sales | (1,383,603) | (1,485,631) | (1,394,822) |
Finance costs | $ (76,939) | (57,807) | $ (50,124) |
Balances originally reported [Member] |  |  |  |
Disclosure Of Basis Of Presentation For Consolidated Financial Statement [Line Items] |  |  |  |
Trade and other receivables, current |  | 464,855 |  |
Trade receivables due from related parties, current |  | 44,554 |  |
Other non-financial assets, current |  | 49,186 |  |
Intangible assets other than goodwill |  | 188,283 |  |
Goodwill |  | 34,718 |  |
Cost of sales |  | (1,483,524) |  |
Finance costs |  | (59,914) |  |
Reclassification balances [Member] |  |  |  |
Disclosure Of Basis Of Presentation For Consolidated Financial Statement [Line Items] |  |  |  |
Trade and other receivables, current |  | 1,764 |  |
Trade receivables due from related parties, current |  | (1,764) |  |
Other non-financial assets, current |  | (1,214) |  |
Intangible assets other than goodwill |  | 1,067 |  |
Goodwill |  | 148 |  |
Cost of sales |  | (2,107) |  |
Finance costs |  | 2,107 |  |
Reclassified balances [member] |  |  |  |
Disclosure Of Basis Of Presentation For Consolidated Financial Statement [Line Items] |  |  |  |
Trade and other receivables, current |  | 466,619 |  |
Trade receivables due from related parties, current |  | 42,790 |  |
Other non-financial assets, current |  | 47,972 |  |
Intangible assets other than goodwill |  | 189,350 |  |
Goodwill |  | 34,866 |  |
Cost of sales |  | (1,485,631) |  |
Finance costs |  | $ (57,807) |  |

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