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Consolidated Statements of Operations (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Oct. 02, 2015
Sep. 30, 2016
Oct. 02, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total share based compensation     $ 6,467 $ 7,263
Cost of Sales [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total share based compensation $ 1,450 $ 1,623 4,216 4,140
Selling General and Administrative [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total share based compensation $ 793 $ 2,068 $ 2,251 $ 3,123