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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Components of inventories    
Raw materials $ 8,619us-gaap_InventoryRawMaterials $ 9,783us-gaap_InventoryRawMaterials
Work in process 2,896us-gaap_InventoryWorkInProcess 3,087us-gaap_InventoryWorkInProcess
Finished goods 5,909us-gaap_InventoryFinishedGoods 5,385us-gaap_InventoryFinishedGoods
Inventories, net $ 17,424us-gaap_InventoryNet $ 18,255us-gaap_InventoryNet