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Employee Benefits (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 01, 2016
Oct. 03, 2015
Oct. 01, 2016
Oct. 03, 2015
Compensation and Retirement Disclosure [Abstract]        
Service cost $ 246 $ 251 $ 750 $ 851
Interest cost on projected benefit obligation 1,179 1,300 3,721 3,800
Expected return on plan assets (1,561) (1,563) (4,663) (4,609)
Amortization of unrecognized loss 340 138 787 560
Net periodic pension cost $ 204 $ 126 $ 595 $ 602