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Expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Analysis of income and expense [abstract]    
Cost of sales $ 2,570,840 $ 3,128,237
Selling and distribution 498,738 464,474
Administrative expenses 74,486 60,367
Total expenses by function 3,144,064 3,653,078
Cost of raw materials and purchased methanol 2,169,027 2,742,370
Ocean freight and other logistics 334,650 399,293
Employee expenses, including share-based compensation 184,171 182,519
Other expenses 112,089 83,593
Cost of sales and operating expenses 2,799,937 3,407,775
Depreciation and amortization 344,127 245,303
Total expenses by nature $ 3,144,064 $ 3,653,078