Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Income Tax Disclosure [Abstract]
Federal statutory tax expense	$ 45,098	$ 55,020	$ 36,836
State taxes, net of federal tax effect	3,874	4,269	4,118
Credit for increasing research activities	(3,808)	(3,320)	(2,569)
Deduction related to domestic production activities	(2,243)	(3,320)	(1,751)
Valuation allowance	231	565	2,474
Goodwill Impairment	0	0	4,298
Change in uncertain tax positions	117	(1,344)	1,099
Other – net	4	(106)	(729)
Total income tax expense	$ 43,273	$ 51,764	$ 43,776