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Segment and Geographical Information - Net Sales and Operating Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 28, 2024
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Product Information [Line Items]          
Net sales     $ 1,630,308 $ 1,643,330 $ 1,717,267
Operating income (loss)     39,481 (65,264) 26,135
Asset impairment $ 25,000 $ 62,000 25,169 62,300 0
Operating Segments | High Purity Cellulose          
Product Information [Line Items]          
Net sales     1,301,622 1,312,764 1,335,846
Operating income (loss)     75,593 (41,567) 31,498
Asset impairment     25,169 62,300  
Operating Segments | High Purity Cellulose | Cellulose Specialties          
Product Information [Line Items]          
Net sales     871,752 783,424 866,225
Operating Segments | High Purity Cellulose | Commodity Products          
Product Information [Line Items]          
Net sales     341,128 431,902 354,612
Operating Segments | High Purity Cellulose | Other sales          
Product Information [Line Items]          
Net sales     88,742 97,438 115,009
Operating Segments | Paperboard          
Product Information [Line Items]          
Net sales     227,628 219,408 250,167
Operating income (loss)     31,431 37,160 37,158
Asset impairment     0 0  
Operating Segments | High-Yield Pulp          
Product Information [Line Items]          
Net sales     126,897 135,954 159,704
Operating income (loss)     (7,594) (3,155) 16,199
Asset impairment     0 0  
Eliminations          
Product Information [Line Items]          
Net sales     (25,839) (24,796) (28,450)
Corporate          
Product Information [Line Items]          
Operating income (loss)     $ (59,949) $ (57,702) $ (58,720)