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Related parties - Narrative (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
Atlas Methanol Company Unlimited |  |
Disclosure of associates [line items] |  |
Percentage of marketing rights in production | 100.00% |
Loans outstanding from related party transactions | $ 76,322 | 76,244
Associates | Atlas Methanol Company Unlimited |  |
Disclosure of associates [line items] |  |
Revenue | 459,000 | 214,000
Receivables from related party transactions | 13,000 | 7,000
Payables from related party transactions | 98,000 | 55,000
Loans outstanding from related party transactions | $ 76,000 | $ 76,000

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