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Stock-Based Compensation - Stock Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Sep. 26, 2015
Sep. 27, 2014
Stock-based compensation expense        
Stock-based compensation, before income taxes $ 10,476 $ 8,251 $ 30,349 $ 23,132
Provision for income taxes (3,733) (2,943) (10,737) (8,271)
Stock-based compensation, net of income taxes 6,743 5,308 19,612 14,861
Cost of revenue        
Stock-based compensation expense        
Stock-based compensation, before income taxes 1,670 1,337 4,959 4,008
Selling, general and administrative        
Stock-based compensation expense        
Stock-based compensation, before income taxes $ 8,806 $ 6,914 $ 25,390 $ 19,124