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Inventories (Details) - USD ($)
$ in Thousands
Jun. 27, 2015
Dec. 27, 2014
Inventories [Abstract]    
Raw materials and supplies $ 70,487 $ 53,586
Work-in-process 51,978 39,707
Finished goods 163,497 168,481
Valuation reserves (7,025) (5,189)
Inventories $ 278,937 $ 256,585