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Benefit Plans (Schedule of Net Defined Benefit Cost) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 01, 2016
Jul. 03, 2015
Jul. 01, 2016
Jul. 03, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]        
Service cost $ 110 $ 78 $ 218 $ 157
Interest cost 45 15 88 30
Amortization of net loss 47 12 93 26
Expected return on plan assets (4) (3) (9) (6)
Net defined benefit cost $ 198 $ 102 $ 390 $ 207