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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 28, 2014
Dec. 31, 2013
Inventory Items, Net Of Reserves Alternative [Abstract]    
Raw materials $ 88,054 $ 76,930
Work in progress 20,317 19,656
Finished goods 164,393 146,214
Total inventories $ 272,764 $ 242,800