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Geographic and Service Group Information (Long-Lived Assets Attributable To Geographic Area) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Jan. 01, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total long-lived assets $ 105,365 $ 107,713
North America [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total long-lived assets 89,199 89,087
International (Primarily European Countries) [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total long-lived assets $ 16,166 $ 18,626