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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Raw materials $ 44,847us-gaap_InventoryRawMaterialsNetOfReserves $ 39,029us-gaap_InventoryRawMaterialsNetOfReserves
Work in process 13,876us-gaap_InventoryWorkInProcessNetOfReserves 14,736us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 89,426us-gaap_InventoryFinishedGoodsNetOfReserves 89,446us-gaap_InventoryFinishedGoodsNetOfReserves
Total inventory $ 148,149us-gaap_InventoryNet $ 143,211us-gaap_InventoryNet