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INVENTORIES (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
INVENTORIES [Abstract]    
Raw materials $ 14,908us-gaap_InventoryRawMaterials $ 12,956us-gaap_InventoryRawMaterials
Work in process 1,918us-gaap_InventoryWorkInProcess 1,779us-gaap_InventoryWorkInProcess
Finished goods 236us-gaap_InventoryFinishedGoods 240us-gaap_InventoryFinishedGoods
Inventories, net $ 17,062us-gaap_InventoryNet $ 14,975us-gaap_InventoryNet