Deferred Compensation and Other Benefits - Schedule of Net Periodic Pension Cost for ESBP (Details) - Deferred Compensation and Other Benefits [Member] - Executive Officer [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2017	Sep. 30, 2016	Sep. 29, 2017	Sep. 30, 2016
Net periodic pension cost for the Executive Supplemental Benefit Plan
Interest cost	$ 55	$ 60	$ 165	$ 182
Amortization of actuarial loss	40	43	118	129
Net periodic pension cost	$ 95	$ 103	$ 283	$ 311