Shareholders' Equity - Changes in AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jul. 01, 2022	Jun. 30, 2023	Jul. 01, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Accumulated other comprehensive income (loss)	$ (63,515)	$ (82,429)	$ (69,378)	$ (80,169)
Other comprehensive income (loss) before reclassifications	4,553	(13,532)	9,528	(16,492)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	931	1,048	1,819	1,748
Ending Accumulated other comprehensive income (loss)	(58,031)	(94,913)	(58,031)	(94,913)
Pension and Postretirement Medical
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Accumulated other comprehensive income (loss)	(38,846)	(59,407)	(39,734)	(60,107)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	931	1,048	1,819	1,748
Ending Accumulated other comprehensive income (loss)	(37,915)	(58,359)	(37,915)	(58,359)
Cumulative Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Accumulated other comprehensive income (loss)	(24,669)	(23,022)	(29,644)	(20,062)
Other comprehensive income (loss) before reclassifications	4,553	(13,532)	9,528	(16,492)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0	0	0
Ending Accumulated other comprehensive income (loss)	$ (20,116)	$ (36,554)	$ (20,116)	$ (36,554)