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Inventory (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Inventory    
Raw materials and supplies - production locations $ 59,086 $ 48,011
Raw materials and supplies - customer locations 10,423 9,241
Work-in-process 20,234 12,529
Finished goods 3,229 2,610
Inventory $ 92,972 $ 72,391