Quarterly report pursuant to Section 13 or 15(d)

Supplemental Retirement Plan and Related Post Retirement Benefits - Summary of the Components of Net Periodic Cost (Details)

v3.19.1
Supplemental Retirement Plan and Related Post Retirement Benefits - Summary of the Components of Net Periodic Cost (Details)
$ in Thousands
3 Months Ended
Mar. 30, 2019
USD ($)
retirement_plan
Mar. 31, 2018
USD ($)
Retirement Benefits [Abstract]    
Number of non-qualified supplemental retirement defined benefit plans | retirement_plan 2  
SERP    
Defined Benefit Plan Disclosure    
Service Cost $ 45 $ 50
Interest Cost 229 225
Amortization of Prior Service Cost 97 97
Amortization of Net Actuarial Losses 75 157
Net Periodic Cost 446 529
SERP | SERP Medical    
Defined Benefit Plan Disclosure    
Service Cost 3 4
Interest Cost 12 11
Amortization of Prior Service Cost 4 4
Amortization of Net Actuarial Losses 10 15
Net Periodic Cost $ 29 $ 34