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Inventory (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Inventory [Line Items]    
Inventory, Raw Materials and Purchased Parts, Net of Reserves $ 15,330,000 $ 17,278,000
Inventory, Work in Process, Net of Reserves 2,752,000 2,034,000
Inventory, Finished Goods, Net of Reserves 5,885,000 6,453,000
Inventory, Net $ 23,967,000 $ 25,765,000