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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 28, 2014
Dec. 28, 2013
Inventory Disclosure [Abstract]    
Raw materials $ 59,056 $ 62,241
Work in process 16,428 21,698
Finished goods 85,018 77,626
Inventories $ 160,502 $ 161,565