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Inventories (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Components of inventories |  |
Total | $ 48,038 | $ 49,615
Reserve for obsolete and excess inventory | (5,477) | (5,520)
Inventories, net | $ 42,561 | $ 44,095

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