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Inventory, as restated (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Inventory, as restated                
Raw materials and supplies - production locations $ 92,221       $ 48,011      
Raw materials and supplies - customer locations 12,405       9,241      
Work-in-process 29,349       12,529      
Finished goods 5,411       2,610      
Inventory $ 139,386 $ 134,203 $ 114,571 $ 92,972 $ 72,391 $ 80,601 $ 73,190 $ 65,474