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Inventories (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Components of inventories |  |
Inventory, Gross | $ 67,083 | $ 60,500
Inventory Valuation Reserves | (4,865) | (4,595)
Inventories, net | $ 62,218 | $ 55,905

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