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Inventory (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Inventory    
Raw materials and supplies - production locations $ 48,011 $ 32,941
Raw materials and supplies - customer locations 9,241 6,755
Work-in-process 12,529 5,589
Finished goods 2,610 2,625
Inventory $ 72,391 $ 47,910