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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Inventories    
Finished goods $ 23,990 $ 41,310
Work in process 63,025 72,070
Raw materials 21,346 29,729
Supplies 346 665
Inventories $ 108,707 $ 143,774