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Consolidated Statements of Income (Loss) - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Statement [Abstract]      
Type of Revenue [Extensible List] Net sales Net sales Net sales
Net sales $ 1,084,694 $ 916,498 $ 927,673
Type of Cost, Good or Service [Extensible List] Net sales Net sales Net sales
Costs of products sold $ 939,899 $ 768,629 $ 780,131
Gross profit 144,795 147,869 147,542
Selling, general and administrative expenses 121,250 100,045 94,967
Gains on dispositions of plant, equipment and timberlands, net (5,069) (1,332) (2,060)
Operating income 28,614 49,156 54,635
Non-operating income (expense)      
Interest expense (12,353) (7,022) (10,408)
Interest income 73 399 1,123
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement 0 6,154 75,326
Other, net (2,657) (4,020) (4,477)
Total non-operating expense (14,937) (16,797) (89,088)
Income (loss) before income taxes 13,677 32,359 (34,453)
Income tax provision (benefit) 6,956 11,576 (9,242)
Income (loss) from continuing operations 6,721 20,783 (25,211)
Discontinued operations:      
Income before income taxes 216 544 1,284
Income tax provision (benefit) 0 29 (2,386)
Income from discontinued operations 216 515 3,670
Net income (loss) $ 6,937 $ 21,298 $ (21,541)
Basic earnings (loss) per share      
Income (loss) from continuing operations (in dollars per share) $ 0.15 $ 0.47 $ (0.57)
Income from discontinued operations (in dollars per share) 0 0.01 0.08
Basic earnings per share (in dollars per share) 0.15 0.48 (0.49)
Diluted earnings (loss) per share      
Income (loss) from continuing operations (in dollars per share) 0.15 0.47 (0.57)
Income (loss) from discontinued operations (in dollars per share) 0 0.01 0.08
Diluted earnings per share (in dollars per share) $ 0.15 $ 0.48 $ (0.49)
Weighted average shares outstanding      
Basic (in shares) 44,551 44,339 44,132
Diluted (in shares) 44,924 44,614 44,132