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Income Taxes - (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Jul. 01, 2017
Jul. 02, 2016
Changes in the balances of gross unrecognized tax benefits        
Effective tax rate (as a percent) 34.00% 27.00% 36.00% 33.10%
GNU gain on sale of business assets $ 250 $ 3,836 $ 250 $ 3,836
Tax benefit related to stock-based compensation $ 100   $ 300