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Inventories (Tables)
9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventory
The components of inventories were as follows: 
September 30,December 31,
(in thousands)20212020
Raw materials and supplies$91,229 $74,302 
Work-in-process24,440 22,913 
Finished goods209,819 260,467 
Inventories$325,488 $357,682