Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Income Tax Disclosure [Abstract]
Federal statutory tax expense	$ 29,970	$ 24,943	$ 24,678
State taxes, net of federal tax effect	5,159	3,997	2,197
Credit for increasing research activities	(4,050)	(3,950)	(3,407)
Deduction related to domestic production activities	0	0	(1,537)
Valuation allowance	98	(1,141)	4,232
Federal rate adjustment to deferred taxes	0	0	(45,386)
Equity based compensation	639	(666)	(1,544)
Change in uncertain tax positions	(357)	766	(163)
Foreign income tax rate differential	596	124	2,094
Other – net	156	1,326	(450)
Total income tax expense	$ 32,211	$ 25,399	$ (19,286)