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Inventories (Tables)
6 Months Ended
Jun. 30, 2015
Inventories Disclosure [Abstract]  
Schedule of Inventory [Table Text Block]
June 30,December 31,
20152014
(in thousands)
Finished goods$10,607$10,138
Work in process1,256946
Raw materials11,2059,447
Total$23,068$20,531