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INVENTORIES (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
INVENTORIES [Abstract]    
Raw materials $ 21,564us-gaap_InventoryRawMaterialsNetOfReserves $ 19,647us-gaap_InventoryRawMaterialsNetOfReserves
Work in process 62,269us-gaap_InventoryWorkInProcessNetOfReserves 36,627us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 4,040us-gaap_InventoryFinishedGoodsNetOfReserves 8,530us-gaap_InventoryFinishedGoodsNetOfReserves
Inventory, net, total 87,873us-gaap_InventoryNet 64,804us-gaap_InventoryNet
Aggregate inventory write-downs $ 1,486us-gaap_InventoryValuationReserves $ 2,445us-gaap_InventoryValuationReserves