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Expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Analysis of income and expense [abstract]    
Cost of sales $ 2,107,533 $ 2,570,840
Selling and distribution 498,126 498,738
Administrative expenses 106,593 74,486
Total expenses by function 2,712,252 3,144,064
Cost of raw materials and purchased methanol 1,705,387 2,169,027
Ocean freight and other logistics 328,635 334,650
Employee expenses, including share-based compensation 246,779 184,171
Other expenses 74,322 112,089
Cost of sales and operating expenses 2,355,123 2,799,937
Depreciation and amortization 357,129 344,127
Total expenses by nature $ 2,712,252 $ 3,144,064