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Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 30, 2024
Apr. 01, 2023
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Net sales $ 387,656 $ 466,761  
Operating income (loss) 17,075 16,594  
Total assets 2,135,046   $ 2,182,700
Operating Segments | High Purity Cellulose      
Segment Reporting Information [Line Items]      
Net sales 306,808 374,194  
Operating income (loss) 20,741 12,934  
Total assets 1,485,599   1,510,076
Operating Segments | High Purity Cellulose | Cellulose Specialties      
Segment Reporting Information [Line Items]      
Net sales 194,423 226,665  
Operating Segments | High Purity Cellulose | Commodity Products      
Segment Reporting Information [Line Items]      
Net sales 90,001 124,040  
Operating Segments | High Purity Cellulose | Other      
Segment Reporting Information [Line Items]      
Net sales 22,384 23,489  
Operating Segments | Paperboard      
Segment Reporting Information [Line Items]      
Net sales 52,960 58,994  
Operating income (loss) 7,909 9,734  
Total assets 101,873   105,804
Operating Segments | High-Yield Pulp      
Segment Reporting Information [Line Items]      
Net sales 34,326 41,860  
Operating income (loss) (671) 7,256  
Total assets 48,028   43,811
Eliminations      
Segment Reporting Information [Line Items]      
Net sales (6,438) (8,287)  
Corporate      
Segment Reporting Information [Line Items]      
Operating income (loss) (10,904) $ (13,330)  
Total assets $ 499,546   $ 523,009