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Geographic And Group Information (Long-Lived Assets Attributable To Geographic Area) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total long-lived assets $ 106,924 $ 90,486
North America [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total long-lived assets 90,579 78,200
International (Primarily European Countries) [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total long-lived assets $ 16,345 $ 12,286