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Investment in associate - Statements of income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of associates [line items] |  |
Revenue | $ 3,060,642 | $ 1,998,429
Operating income | 476,468 | 28,446
Income tax expense | (95,788) | 9,279
Net income (loss) | 375,097 | (28,225)
Atlas Methanol Company Unlimited |  |
Disclosure of associates [line items] |  |
Net income (loss) | 75,995 | 19,930
Dividends received from associate | $ 84,553 | $ 47,325
Percentage of ownership interest in associates | 63.10% | 63.10%
Atlas Methanol Company Unlimited |  |
Disclosure of associates [line items] |  |
Revenue | $ 459,367 | $ 213,533
Cost of sales and depreciation and amortization | (261,121) | (145,126)
Operating income | 198,246 | 68,407
Finance costs, finance income and other expenses | (11,170) | (12,771)
Income tax expense | (66,640) | (24,052)
Net income (loss) | $ 120,436 | $ 31,584

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