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Consolidated Statements of Operations (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 03, 2015
Jun. 27, 2014
Jul. 03, 2015
Jun. 27, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total share based compensation     $ 3,572 $ 3,029
Cost of Sales [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total share based compensation $ 1,208 $ 999 2,517 1,685
Selling General and Administrative [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total share based compensation $ 540 $ 691 $ 1,055 $ 1,344