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Inventory (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Inventory [Line Items]    
Inventory, Raw Materials and Purchased Parts, Net of Reserves $ 16,646,000 $ 17,278,000
Inventory, Work in Process, Net of Reserves 1,993,000 2,034,000
Inventory, Finished Goods, Net of Reserves 7,476,000 6,453,000
Inventory, Net $ 26,115,000 $ 25,765,000