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Geographic And Group Information (Geographic Revenue) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 27, 2014
Jun. 28, 2013
Jun. 27, 2014
Jun. 28, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue $ 61,052 $ 58,961 $ 115,957 $ 113,310
North America [Member]
       
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue 48,297 46,636 94,703 88,946
International Primarily European Countries [Member]
       
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue $ 12,755 $ 12,325 $ 21,254 $ 24,364