Pension and Other Postretirement Benefits - Other Postretirement Benefits (Details) - Other Postretirement Benefit Plan - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 25, 2022	Sep. 30, 2023	Sep. 25, 2022
Pension Benefits
Service cost	$ 8	$ 11	$ 25	$ 34
Interest cost	375	183	1,126	548
Amortization of actuarial loss	486	823	1,455	2,470
Amortization of prior service credit	0	0	0	(368)
Net periodic pension (income)/cost or postretirement benefit cost	$ 869	$ 1,017	$ 2,606	$ 2,684