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Geographic and Service Group Information (Long-Lived Assets Attributable to Geographic Area) (Details) - USD ($)
$ in Thousands
Dec. 30, 2016
Jan. 01, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total long-lived assets $ 90,486 $ 92,892
North America [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total long-lived assets 78,200 78,230
International (Primarily European Countries) [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total long-lived assets $ 12,286 $ 14,662