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Inventory (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Inventory    
Raw materials and supplies - production locations $ 59,918 $ 32,941
Raw materials and supplies - customer locations 8,371 6,755
Work-in-process 5,870 5,589
Finished goods 6,442 2,625
Inventory $ 80,601 $ 47,910