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Employee Benefit Plans (Details) - Components of other postretirement benefit cost - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 01, 2016
Sep. 26, 2015
Oct. 01, 2016
Sep. 26, 2015
Components of other postretirement benefit cost [Abstract]        
Interest cost $ 64 $ 70 $ 191 $ 210
Amortization of prior service benefit   (23)   (69)
Amortization of actuarial loss 24 29 71 87
Net periodic postretirement benefit cost $ 88 $ 76 $ 262 $ 228