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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Inventories    
Finished goods $ 41,310 $ 41,557
Work in process 72,070 77,159
Raw materials 29,729 43,028
Supplies 665 817
Inventories $ 143,774 $ 162,561