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Benefit Plans (Net Pension Costs) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 28, 2018
Dec. 29, 2017
Dec. 30, 2016
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 214 $ 200 $ 173
Interest cost 48 42 36
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement 69 0 0
Expected return on assets (17) (19) (18)
Recognized net actuarial loss 33 44 38
Net pension cost $ 347 $ 267 $ 229