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Inventories (Tables)
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of inventory
The components of inventories were as follows: 
September 30,December 31,
(in thousands)20202019
Raw materials and supplies$67,260 $87,675 
Work-in-process20,012 22,024 
Finished goods231,084 288,669 
Inventories$318,356 $398,368