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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Inventories Disclosure [Abstract]    
Finished Goods $ 7,679 $ 6,936
Work in Process 3,834 3,667
Raw Materials 15,044 14,484
Total Inventories, Net $ 26,557 $ 25,087