Pension and Other Postretirement Benefits - Other Postretirement Benefits (Details) - Other Postretirement Benefit Plan - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 26, 2022	Jun. 30, 2023	Jun. 26, 2022
Pension Benefits
Service cost	$ 8	$ 11	$ 17	$ 23
Interest cost	375	183	750	365
Amortization of actuarial loss	486	823	972	1,647
Amortization of prior service credit	0	(132)	0	(368)
Net periodic pension (income)/cost or postretirement benefit cost	$ 869	$ 885	$ 1,739	$ 1,667