Income Taxes (Effective Income Tax Rate Reconciliation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Income Tax Disclosure [Abstract]
Federal statutory tax expense (benefit)	$ 27,386	$ 24,639	$ 14,640
State taxes, net of federal tax effect	2,164	2,096	1,199
Credit for increasing research activities	0	(942)	(839)
Deduction related to domestic production activities	(1,192)	(1,005)	(874)
Foreign income tax	(899)	(629)	(666)
Executive compensation limitation	1,672	40	0
Valuation allowance	0	2	1,149
Uncertain tax positions	611	654	558
Other tax credits	0	(203)	0
Other - net	(464)	(241)	(280)
Total income tax expense (benefit)	$ 29,278	$ 24,411	$ 14,887