Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Oct. 02, 2020	Sep. 27, 2019	Jul. 03, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Effective income tax rate	3.40%	13.80%	9.30%	16.00%
Income (loss) before provision for income taxes	$ 31,400	$ 35,499	$ 68,204	$ 95,463
Discrete tax benefits	4,900	$ 2,300	5,900	$ 4,400
Unrecognized tax benefits	5,000		5,000			$ 4,400
Significant change in unrecognized tax benefits is reasonably possible, amount of unrecorded benefit	3,900		3,900
Unrecognized tax benefits that would impact effective tax rate	5,000		5,000			$ 4,400
Accrued Payroll Taxes	$ 6,500		$ 6,500		$ 6,500