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Pension and Other Postretirement Obligations (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 29, 2025
Jun. 30, 2024
Jun. 29, 2025
Jun. 30, 2024
Pension Obligations        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 882 $ 739 $ 1,644 $ 1,487
Interest cost 3,832 3,660 7,600 7,336
Expected return on plan assets (3,974) (4,027) (7,798) (8,074)
Amortization of prior service cost 39 44 76 89
Actuarial losses (gains) 321 (26) 640 (52)
Net periodic benefit cost 1,100 390 2,162 786
Other Postretirement Obligations        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 8 10 15 20
Interest cost 230 235 453 473
Expected return on plan assets 0 0 0 0
Amortization of prior service cost 0 0 0 0
Actuarial losses (gains) (84) (116) (166) (233)
Net periodic benefit cost $ 154 $ 129 $ 302 $ 260