Supplemental Retirement Plan and Related Post Retirement Benefits - Summary of the Components of Net Periodic Cost (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 29, 2019 USD ($) retirement_plan	Jun. 30, 2018 USD ($)
Retirement Benefits [Abstract]
Number of non-qualified supplemental retirement defined benefit plans | retirement_plan			2
SERP
Defined Benefit Plan Disclosure
Service Cost	$ 46	$ 50	$ 91	$ 100
Interest Cost	229	225	458	450
Amortization of Prior Service Cost	96	97	193	194
Amortization of Net Actuarial Losses	75	157	150	314
Net Periodic Cost	446	529	892	1,058
SERP | SERP Medical
Defined Benefit Plan Disclosure
Service Cost	4	4	7	8
Interest Cost	11	12	23	23
Amortization of Prior Service Cost	4	4	8	8
Amortization of Net Actuarial Losses	11	15	21	29
Net Periodic Cost	$ 30	$ 35	$ 59	$ 68