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Benefit Plans (Change in Projected Benefit Obligation) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 28, 2018
Dec. 29, 2017
Dec. 30, 2016
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation at beginning of year $ 2,608 $ 2,285  
Service cost 214 200 $ 173
Interest cost 48 42 36
Plan participants’ contribution 84 75  
Actuarial gain (150) (90)  
Benefits (paid) transferred in, net 42 11  
Defined Benefit Plan, Settlement and Curtailment (619) 0  
Foreign currency translation (24) 107  
Projected benefit obligation at end of year $ 2,203 $ 2,608 $ 2,285