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Inventories - Schedule of Inventory (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Finished goods $ 8,172 $ 8,505
Work-in-process 25,029 29,005
Raw materials and purchased parts 91,122 105,306
Stores and supplies 33,293 30,197
Total inventories $ 157,616 $ 173,013