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Expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Analysis of income and expense [abstract]    
Cost of sales $ 2,035,545 $ 1,533,915
Selling and distribution 449,593 408,893
Administrative expenses 99,036 59,675
Total expenses by function 2,584,174 2,002,483
Cost of raw materials and purchased methanol 1,637,085 1,140,551
Ocean freight and other logistics 374,717 351,609
Employee expenses, including share-based compensation 243,707 204,762
Other expenses 96,440 77,507
Cost of sales and operating expenses 2,351,949 1,774,429
Depreciation and amortization 232,225 228,054
Total expenses by nature 2,584,174 2,002,483
Adjustments for share-based payments $ 78,821 $ 33,493