CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Statement [Abstract]
Net sales	$ 329,443	$ 357,005	$ 656,699	$ 735,213
Costs of products sold	292,656	338,872	585,402	680,866
Gross profit	36,787	18,133	71,297	54,347
Selling, general and administrative expenses	29,420	28,639	65,477	59,384
Losses (gains) on dispositions of plant, equipment and timberlands, net	73	(21)	71	(665)
Operating income (loss)	7,294	(10,485)	5,749	(4,372)
Non-operating income (expense)
Interest expense	(17,900)	(17,261)	(35,585)	(29,855)
Interest income	273	559	534	830
Other, net	(2,509)	(3,045)	(4,536)	(6,323)
Total non-operating expense	(20,136)	(19,747)	(39,587)	(35,348)
Loss from continuing operations before income taxes	(12,842)	(30,232)	(33,838)	(39,720)
Income tax provision	2,953	6,399	8,107	10,093
Loss from continuing operations	(15,795)	(36,631)	(41,945)	(49,813)
Discontinued operations:
Loss before income taxes	(484)	(309)	(681)	(711)
Income tax provision	0	0	0	0
Loss from discontinued operations	(484)	(309)	(681)	(711)
Net loss	$ (16,279)	$ (36,940)	$ (42,626)	$ (50,524)
Basic earnings per share
Loss from continuing operations (in dollars per share)	$ (0.35)	$ (0.82)	$ (0.93)	$ (1.11)
Loss from discontinued operations (in dollars per share)	(0.02)	(0.01)	(0.02)	(0.02)
Basic loss per share (in dollars per share)	(0.37)	(0.83)	(0.95)	(1.13)
Diluted earnings per share
Loss from continuing operations (in dollars per share)	(0.35)	(0.82)	(0.93)	(1.11)
Loss from discontinued operations (in dollars per share)	(0.02)	(0.01)	(0.02)	(0.02)
Diluted loss per share (in dollars per share)	$ (0.37)	$ (0.83)	$ (0.95)	$ (1.13)
Weighted average shares outstanding
Basic (in shares)	45,338	45,041	45,261	44,999
Diluted (in shares)	45,338	45,041	45,261	44,999