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Inventory (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Inventory    
Raw materials and supplies - production locations $ 187,449 $ 92,221
Raw materials and supplies - customer locations 16,294 12,405
Work-in-process 58,341 29,349
Finished goods 7,079 5,411
Inventory $ 269,163 $ 139,386