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Employee Benefits (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 02, 2016
Apr. 04, 2015
Compensation and Retirement Disclosure [Abstract]    
Service cost $ 252 $ 300
Interest cost on projected benefit obligation 1,271 1,250
Expected return on plan assets (1,551) (1,523)
Amortization of unrecognized loss 223 211
Net periodic pension cost $ 195 $ 238