CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Net sales	$ 357,005	$ 363,963	$ 735,213	$ 745,643
Costs of products sold	338,872	326,566	680,866	676,581
Gross profit	18,133	37,397	54,347	69,062
Selling, general and administrative expenses	28,639	28,400	59,384	61,566
Goodwill and other asset impairment charges	0	0	0	117,349
Gains (losses) on dispositions of plant, equipment and timberlands, net	(21)	73	(665)	(2,888)
Operating income (loss)	(10,485)	8,924	(4,372)	(106,965)
Non-operating income (expense)
Interest expense	(17,261)	(7,672)	(29,855)	(15,534)
Interest income	559	38	830	55
Other, net	(3,045)	(455)	(6,323)	(1,795)
Total non-operating expense	(19,747)	(8,089)	(35,348)	(17,274)
Income (loss) from continuing operations before income taxes	(30,232)	835	(39,720)	(124,239)
Income tax provision (benefit)	6,399	3,295	10,093	(13,489)
Loss from continuing operations	(36,631)	(2,460)	(49,813)	(110,750)
Discontinued operations:
Income (loss) before income taxes	(309)	408	(711)	371
Income tax provision	0	0	0	0
Income (loss) from discontinued operations	(309)	408	(711)	371
Net loss	$ (36,940)	$ (2,052)	$ (50,524)	$ (110,379)
Basic earnings per share
Loss from continuing operations (in dollars per share)	$ (0.82)	$ (0.05)	$ (1.11)	$ (2.47)
Income (loss) from discontinued operations (in dollars per share)	(0.01)	0.01	(0.02)	0.01
Basic loss per share (in dollars per share)	(0.83)	(0.04)	(1.13)	(2.46)
Diluted earnings per share
Loss from continuing operations (in dollars per share)	(0.82)	(0.05)	(1.11)	(2.47)
Income (loss) from discontinued operations (in dollars per share)	(0.01)	0.01	(0.02)	0.01
Diluted loss per share (in dollars per share)	$ (0.83)	$ (0.04)	$ (1.13)	$ (2.46)
Weighted average shares outstanding
Basic (in shares)	45,041	44,841	44,999	44,775
Diluted (in shares)	45,041	44,841	44,999	44,775