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Inventories (Tables)
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block] Inventories consisted of the following (in thousands): 
 September 30, 2020December 31, 2019
Raw materials$126,475 $119,709 
Work in process30,151 39,515 
Finished goods165,335 178,416 
Total inventories$321,961 $337,640