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STOCK-BASED COMPENSATION - Stock Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 29, 2019
Jun. 30, 2018
Jun. 29, 2019
Jun. 30, 2018
Stock-based compensation expense        
Stock-based compensation, before income taxes $ 16,505 $ 13,547 $ 29,404 $ 24,088
Provision for income taxes (2,855) (2,454) (4,902) (4,570)
Stock-based compensation, net of income taxes 13,650 11,093 24,502 19,518
Cost of revenue        
Stock-based compensation expense        
Stock-based compensation, before income taxes 2,489 1,738 4,438 3,151
Selling, general and administrative        
Stock-based compensation expense        
Stock-based compensation, before income taxes $ 14,016 $ 11,809 $ 24,966 $ 20,937