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. 29, 2018	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 89	$ 63	$ 175	$ 63
Interest cost	148	134	296	232
Expected return on asset	(162)	(143)	(326)	(212)
Amortization of actuarial loss	73	80	146	159
Net periodic pension cost	$ 148	$ 134	$ 291	$ 242