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STOCK-BASED COMPENSATION - Stock Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Stock-based compensation expense    
Stock-based compensation, before income taxes $ 12,899 $ 10,541
Provision for income taxes (2,047) (2,116)
Stock-based compensation, net of income taxes 10,852 8,425
Cost of revenue    
Stock-based compensation expense    
Stock-based compensation, before income taxes 1,949 1,413
Selling, general and administrative    
Stock-based compensation expense    
Stock-based compensation, before income taxes $ 10,950 $ 9,128