Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2024	Sep. 30, 2023	Sep. 28, 2024	Sep. 30, 2023
Income Statement [Abstract]
Net sales	$ 401,103	$ 368,670	$ 1,207,804	$ 1,220,844
Cost of sales	(357,534)	(359,938)	(1,079,165)	(1,160,044)
Gross margin	43,569	8,732	128,639	60,800
Selling, general and administrative expense	(22,685)	(21,162)	(65,569)	(58,653)
Foreign exchange gain (loss)	(1,828)	624	1,641	(1,510)
Asset impairment (Note 2)	(25,169)	0	(25,169)	0
Indefinite suspension charges (Note 2)	(7,825)	0	(14,451)	0
Other operating income (expense), net	(2,862)	(2,634)	3,381	(4,939)
Operating income (loss)	(16,800)	(14,440)	28,472	(4,302)
Interest expense	(20,479)	(21,015)	(62,604)	(51,949)
Components of pension and OPEB, excluding service costs (Note 14)	783	501	1,900	(834)
Other income (expense), net	(173)	3,281	1,748	6,894
Loss from continuing operations before income tax	(36,669)	(31,673)	(30,484)	(50,191)
Income tax benefit (Note 15)	4,595	5,392	5,916	11,227
Equity in loss of equity method investment	(524)	(259)	(1,427)	(1,591)
Loss from continuing operations	(32,598)	(26,540)	(25,995)	(40,555)
Income from discontinued operations, net of tax (Note 3)	0	1,440	3,217	312
Net loss	$ (32,598)	$ (25,100)	$ (22,778)	$ (40,243)
Basic and Diluted earnings per common share (Note 12)
Loss from continuing operations-basic (in dollars per share)	$ (0.49)	$ (0.41)	$ (0.40)	$ (0.62)
Loss from continuing operations-diluted (in dollars per share)	(0.49)	(0.41)	(0.40)	(0.62)
Income from discontinued operations-basic (in dollars per share)	0	0.02	0.05	0
Income from discontinued operations-diluted (in dollars per share)	0	0.02	0.05	0
Net loss-basic (in dollars per share)	(0.49)	(0.39)	(0.35)	(0.62)
Net loss-diluted (in dollars per share)	$ (0.49)	$ (0.39)	$ (0.35)	$ (0.62)