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Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Apr. 01, 2023
Mar. 26, 2022
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Net sales $ 466,761 $ 351,716  
Operating income (loss) 16,594 (15,792)  
Total assets 2,309,969   $ 2,347,528
Operating Segments | High Purity Cellulose      
Segment Reporting Information [Line Items]      
Net sales 374,194 280,945  
Operating income (loss) 12,934 (7,804)  
Total assets 1,589,328   1,654,214
Operating Segments | High Purity Cellulose | Cellulose Specialties      
Segment Reporting Information [Line Items]      
Net sales 226,665 183,554  
Operating Segments | High Purity Cellulose | Commodity Products      
Segment Reporting Information [Line Items]      
Net sales 124,040 70,755  
Operating Segments | High Purity Cellulose | Other      
Segment Reporting Information [Line Items]      
Net sales 23,489 26,636  
Operating Segments | Paperboard      
Segment Reporting Information [Line Items]      
Net sales 58,994 54,237  
Operating income (loss) 9,734 5,839  
Total assets 115,642   112,757
Operating Segments | High-Yield Pulp      
Segment Reporting Information [Line Items]      
Net sales 41,860 22,141  
Operating income (loss) 7,256 (371)  
Total assets 44,123   50,947
Eliminations      
Segment Reporting Information [Line Items]      
Net sales (8,287) (5,607)  
Corporate      
Segment Reporting Information [Line Items]      
Operating income (loss) (13,330) $ (13,456)  
Total assets $ 560,876   $ 529,610