Deferred Compensation and Other Benefits - Schedule of Net Periodic Pension Cost (Details) - Deferred Compensation and Other Benefits [Member] - Executive Officer [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jul. 01, 2016	Jun. 30, 2017	Jul. 01, 2016
Net periodic pension cost for the Executive Supplemental Benefit Plan
Interest cost	$ 55	$ 61	$ 110	$ 122
Amortization of actuarial loss	39	43	78	86
Net periodic pension cost	$ 94	$ 104	$ 188	$ 208