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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 29, 2014
Dec. 31, 2013
Inventories    
Raw materials $ 44,877us-gaap_InventoryRawMaterialsNetOfReserves $ 43,469us-gaap_InventoryRawMaterialsNetOfReserves
Work in process 13,938us-gaap_InventoryWorkInProcessNetOfReserves 9,476us-gaap_InventoryWorkInProcessNetOfReserves
Finished products 16,692us-gaap_InventoryFinishedGoodsNetOfReserves 13,729us-gaap_InventoryFinishedGoodsNetOfReserves
Inventories $ 75,507us-gaap_InventoryNet $ 66,674us-gaap_InventoryNet