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Inventory (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Inventory    
Raw materials and supplies - production locations $ 72,222 $ 48,011
Raw materials and supplies - customer locations 10,291 9,241
Work-in-process 27,289 12,529
Finished goods 4,769 2,610
Inventory $ 114,571 $ 72,391