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STOCK-BASED COMPENSATION - Stock Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Stock-based compensation expense        
Stock-based compensation $ 11,820 $ 11,526 $ 35,908 $ 32,902
Cost of revenue        
Stock-based compensation expense        
Stock-based compensation 1,596 1,700 4,747 4,989
Selling, general and administrative        
Stock-based compensation expense        
Stock-based compensation $ 10,224 $ 9,826 $ 31,161 $ 27,913