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Benefit Plans (Schedule of Net Defined Benefit Cost) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 29, 2018
Jun. 30, 2017
Jun. 29, 2018
Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 122 $ 115 $ 249 $ 225
Interest cost 45 40 91 78
Amortization of net loss 16 19 32 36
Expected return on plan assets (5) (6) (9) (10)
Net defined benefit cost 178 168 363 329
Discontinued Operations [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Net defined benefit cost 109 101 223 198
Continuing Operations [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Net defined benefit cost $ 69 $ 67 $ 140 $ 131