CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Net sales	$ 332,101	$ 329,921	$ 988,800	$ 1,065,134
Costs of products sold	296,620	285,434	882,022	966,300
Gross profit	35,481	44,487	106,778	98,834
Selling, general and administrative expenses	32,511	24,714	97,988	84,098
Loss on sale of Ober-Schmitten	0	17,805	0	17,805
Losses (gains) on dispositions of plant, equipment and timberlands, net	(1)	(685)	70	(1,350)
Operating income (loss)	2,971	2,653	8,720	(1,719)
Non-operating income (expense)
Interest expense	(18,404)	(17,386)	(53,989)	(47,241)
Interest income	237	329	771	1,159
Other, net	(3,316)	(1,948)	(7,852)	(8,271)
Total non-operating expense	(21,483)	(19,005)	(61,070)	(54,353)
Loss from continuing operations before income taxes	(18,512)	(16,352)	(52,350)	(56,072)
Income tax provision	1,490	3,328	9,597	13,421
Loss from continuing operations	(20,002)	(19,680)	(61,947)	(69,493)
Discontinued operations:
Income (loss) before income taxes	4,755	(183)	4,074	(894)
Income tax provision	0	0	0	0
Income (loss) from discontinued operations	4,755	(183)	4,074	(894)
Net loss	$ (15,247)	$ (19,863)	$ (57,873)	$ (70,387)
Basic earnings per share
Loss from continuing operations (in dollars per share)	$ (0.44)	$ (0.43)	$ (1.37)	$ (1.54)
Income (loss) from discontinued operations (in dollars per share)	0.11	0	0.09	(0.02)
Basic loss per share (in dollars per share)	(0.33)	(0.43)	(1.28)	(1.56)
Diluted earnings per share
Loss from continuing operations (in dollars per share)	(0.44)	(0.43)	(1.37)	(1.54)
Income (loss) from discontinued operations (in dollars per share)	0.11	0	0.09	(0.02)
Diluted loss per share (in dollars per share)	$ (0.33)	$ (0.43)	$ (1.28)	$ (1.56)
Weighted average shares outstanding
Basic (in shares)	45,442	45,099	45,322	45,033
Diluted (in shares)	45,442	45,099	45,322	45,033