Pension Plans - Pension plan net periodic benefit costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Apr. 01, 2022
Qualified Pension Plan
Defined Benefit Plan Disclosure
Service cost	$ (1,450)	$ (800)
Interest cost on projected benefit obligation	7,250	4,250
Expected return on plan assets	(9,550)	(10,525)
Amortization of net loss	1,875	975
Net pension cost (income)	1,025	(4,500)
SERP
Defined Benefit Plan Disclosure
Service cost	0	0
Interest cost on projected benefit obligation	44	22
Expected return on plan assets	0	0
Amortization of net loss	0	15
Net pension cost (income)	$ 44	$ 37