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Inventories - Schedule (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Inventories.    
Finished goods $ 197,982 $ 158,431
Raw materials in progress and industrial supplies 222,912 177,728
Other inventories 34,887 24,902
Advances to suppliers 1,189 170
Total inventories $ 456,970 $ 361,231