Geographic And Group Information (Geographic Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2015	Jun. 27, 2014	Jul. 03, 2015	Jun. 27, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 66,395	$ 61,052	$ 127,369	$ 115,957
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	55,255	49,215	103,965	94,703
International Primarily European Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 11,140	$ 11,837	$ 23,404	$ 21,254