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Geographic And Group Information (Geographic Revenue) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 26, 2014
Sep. 27, 2013
Sep. 26, 2014
Sep. 27, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue $ 60,437 $ 57,916 $ 176,394 $ 171,226
North America [Member]
       
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue 48,094 47,377 142,797 136,323
International Primarily European Countries [Member]
       
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue $ 12,343 $ 10,539 $ 33,597 $ 34,903