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STOCK-BASED COMPENSATION - Stock Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Sep. 28, 2019
Sep. 29, 2018
Stock-based compensation expense        
Stock-based compensation, before income taxes $ 14,025 $ 11,820 $ 43,429 $ 35,908
Provision for income taxes (2,166) (2,370) (7,068) (6,940)
Stock-based compensation, net of income taxes 11,859 9,450 36,361 28,968
Cost of revenue        
Stock-based compensation expense        
Stock-based compensation, before income taxes 2,354 1,596 6,792 4,747
Selling, general and administrative        
Stock-based compensation expense        
Stock-based compensation, before income taxes $ 11,671 $ 10,224 $ 36,637 $ 31,161