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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Inventories Disclosure [Abstract]    
Finished Goods $ 6,729 $ 6,936
Work in Process 4,101 3,667
Raw Materials 14,458 14,484
Total Inventories, Net $ 25,288 $ 25,087