Pension and Postretirement Benefit Obligations - Components of Net Periodic Postretirement Benefit Cost (Details) - Postretirement Benefits - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jul. 01, 2022	Jun. 30, 2023	Jul. 01, 2022
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 294	$ 384	$ 588	$ 767
Interest cost	697	475	1,395	949
Recognized net actuarial loss	0	91	0	183
Net periodic postretirement benefit cost	$ 991	$ 950	$ 1,983	$ 1,899