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STOCK-BASED COMPENSATION - Stock Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 26, 2021
Jun. 27, 2020
Jun. 26, 2021
Jun. 27, 2020
Stock-based compensation expense        
Stock-based compensation, before income taxes $ 17,077 $ 13,143 $ 30,266 $ 24,103
Provision for income taxes (2,465) (1,988) (4,452) (3,539)
Stock-based compensation, net of income taxes 14,612 11,155 25,814 20,564
Cost of revenue        
Stock-based compensation expense        
Stock-based compensation, before income taxes 3,012 2,320 5,725 4,355
Selling, general and administrative        
Stock-based compensation expense        
Stock-based compensation, before income taxes $ 14,065 $ 10,823 $ 24,541 $ 19,748