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Postretirement Health Care (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 03, 2015
Sep. 27, 2014
Oct. 03, 2015
Sep. 27, 2014
Compensation and Retirement Disclosure [Abstract]        
Service cost $ 201 $ 126 $ 603 $ 378
Interest cost 204 184 612 552
Amortization of (gain)/loss 59 0 177 0
Net periodic benefit cost $ 464 $ 310 $ 1,392 $ 930