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Inventories (Tables)
3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block] Inventories consisted of the following (in thousands): 
 
March 31, 2020
 
December 31, 2019
Raw materials
$
121,674

 
$
119,709

Work in process
36,291

 
39,515

Finished goods
153,639

 
178,416

Total inventories
$
311,604

 
$
337,640