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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Finished goods $ 50,000us-gaap_InventoryFinishedGoodsNetOfReserves $ 43,364us-gaap_InventoryFinishedGoodsNetOfReserves
Work-in-process 7,680us-gaap_InventoryWorkInProcessNetOfReserves 6,222us-gaap_InventoryWorkInProcessNetOfReserves
Raw materials 34,093us-gaap_InventoryRawMaterialsNetOfReserves 32,792us-gaap_InventoryRawMaterialsNetOfReserves
Total $ 91,773us-gaap_InventoryNet $ 82,378us-gaap_InventoryNet