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Inventories (Tables)
9 Months Ended
Sep. 30, 2019
Inventories Disclosure [Abstract]  
Schedule of Inventory [Table Text Block]
September 30,December 31,
20192018
(in thousands)
Finished goods$5,835$6,936
Work in process3,8383,667
Raw materials14,22114,484
Total$23,894$25,087