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STOCK-BASED COMPENSATION - Stock Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 26, 2020
Sep. 28, 2019
Sep. 26, 2020
Sep. 28, 2019
Stock-based compensation expense        
Stock-based compensation, before income taxes $ 16,870 $ 14,025 $ 40,973 $ 43,429
Provision for income taxes (2,508) (2,166) (6,047) (7,068)
Stock-based compensation, net of income taxes 14,362 11,859 34,926 36,361
Cost of revenue        
Stock-based compensation expense        
Stock-based compensation, before income taxes 3,261 2,354 7,616 6,792
Selling, general and administrative        
Stock-based compensation expense        
Stock-based compensation, before income taxes $ 13,609 $ 11,671 $ 33,357 $ 36,637