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STOCK-BASED COMPENSATION - Stock Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 27, 2021
Mar. 28, 2020
Stock-based compensation expense    
Stock-based compensation, before income taxes $ 13,189 $ 10,960
Provision for income taxes (1,987) (1,551)
Stock-based compensation, net of income taxes 11,202 9,409
Cost of revenue    
Stock-based compensation expense    
Stock-based compensation, before income taxes 2,713 2,035
Selling, general and administrative    
Stock-based compensation expense    
Stock-based compensation, before income taxes $ 10,476 $ 8,925