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Inventories (Tables)
6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block] Inventories consisted of the following (in thousands): 
 June 30, 2020December 31, 2019
Raw materials$128,972  $119,709  
Work in process40,548  39,515  
Finished goods153,246  178,416  
Total inventories$322,766  $337,640