Pension and Other Postretirement Benefits - Other Postretirement Benefits (Details) - Other Postretirement Benefit Plan - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2022	Jun. 27, 2021	Jun. 26, 2022	Jun. 27, 2021
Pension Benefits
Service cost	$ 11	$ 13	$ 23	$ 26
Interest cost	183	141	365	282
Amortization of actuarial loss	823	852	1,647	1,704
Amortization of prior service credit	(132)	(836)	(368)	(1,672)
Net periodic postretirement benefit cost	$ 885	$ 170	$ 1,667	$ 340