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Geographic and Group Information (Long-Lived Assets Attributable To Geographic Area) (Details) - USD ($)
$ in Thousands
Sep. 28, 2018
Dec. 29, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total long-lived assets $ 113,311 $ 109,946
North America [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total long-lived assets 93,758 90,605
International (Primarily European Countries) [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total long-lived assets $ 19,553 $ 19,341