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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Inventory Items, Net Of Reserves Alternative [Abstract]    
Raw materials $ 84,952us-gaap_InventoryRawMaterialsNetOfReserves $ 76,930us-gaap_InventoryRawMaterialsNetOfReserves
Work in progress 16,749us-gaap_InventoryWorkInProcessNetOfReserves 19,656us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 144,729us-gaap_InventoryFinishedGoodsNetOfReserves 146,214us-gaap_InventoryFinishedGoodsNetOfReserves
Total inventories $ 246,430us-gaap_InventoryNet $ 242,800us-gaap_InventoryNet