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Inventories (Details Textual) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Inventory [Line Items]      
Inventories write downs $ 8,198us-gaap_InventoryWriteDown $ 10,759us-gaap_InventoryWriteDown $ 12,418us-gaap_InventoryWriteDown