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Stock-Based Compensation - Stock Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Stock-based compensation expense    
Stock-based compensation $ 10,541 $ 9,486
Cost of revenue    
Stock-based compensation expense    
Stock-based compensation 1,413 1,546
Selling, general and administrative    
Stock-based compensation expense    
Stock-based compensation $ 9,128 $ 7,940