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Expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Analysis of income and expense [abstract]    
Cost of sales $ 2,577,382 $ 2,035,545
Selling and distribution 464,474 449,593
Administrative expenses 60,367 99,036
Total expenses by function 3,102,223 2,584,174
Cost of raw materials and purchased methanol 2,191,515 1,637,085
Ocean freight and other logistics 399,293 374,717
Employee expenses, including share-based compensation 182,519 243,707
Other expenses 83,593 96,440
Cost of sales and operating expenses 2,856,920 2,351,949
Depreciation and amortization 245,303 232,225
Total expenses by nature 3,102,223 2,584,174
Adjustments for share-based payments $ (6,289) $ 78,821