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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Finished goods $ 77,922us-gaap_InventoryFinishedGoodsNetOfReserves $ 86,143us-gaap_InventoryFinishedGoodsNetOfReserves
Raw materials 60,472us-gaap_InventoryRawMaterialsNetOfReserves 57,509us-gaap_InventoryRawMaterialsNetOfReserves
Work in process 12,581us-gaap_InventoryWorkInProcessNetOfReserves 12,224us-gaap_InventoryWorkInProcessNetOfReserves
Inventory, net $ 150,975us-gaap_InventoryNet $ 155,876us-gaap_InventoryNet