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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Details of inventories [Abstract]    
Finished goods $ 179,760us-gaap_InventoryFinishedGoods $ 120,751us-gaap_InventoryFinishedGoods
Work in process 12,594us-gaap_InventoryWorkInProcess 15,136us-gaap_InventoryWorkInProcess
Inventory, Net, Total $ 192,354us-gaap_InventoryNet $ 135,887us-gaap_InventoryNet