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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 01, 2021
Oct. 02, 2020
Oct. 01, 2021
Oct. 02, 2020
Dec. 31, 2020
Income Tax Disclosure [Abstract]          
Effective income tax rate 4.80% 3.40% 7.50% 9.30%  
Income before provision for income taxes $ 23,179 $ 31,400 $ 78,935 $ 68,204  
Discrete tax benefits 1,600 $ 4,900 6,100 $ 5,900  
Significant change in unrecognized tax benefits is reasonably possible, amount of unrecorded benefit 3,500   3,500    
Unrecognized tax benefits 4,400   4,400    
Unrecognized tax benefits that would impact effective tax rate 4,400   4,400    
Accrued payroll taxes $ 9,700   $ 9,700   $ 9,700