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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Federal statutory tax expense $ 24,943 $ 24,678 $ 45,098
State taxes, net of federal tax effect 3,997 2,197 3,874
Credit for increasing research activities (3,950) (3,407) (3,808)
Deduction related to domestic production activities 0 (1,537) (2,243)
Valuation allowance (1,141) 4,232 231
Federal rate adjustment to deferred taxes 0 (45,386) 0
Equity based compensation (666) (1,544) 0
Change in uncertain tax positions 766 (163) 117
Foreign income tax rate differential 124 2,094 845
Other – net 1,326 (450) (841)
Total income tax expense $ 25,399 $ (19,286) $ 43,273