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Segment and Geographical Information - Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 26, 2022
Mar. 27, 2021
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Net sales $ 351,716 $ 318,678  
Operating income (loss) (15,792) (472)  
Total identifiable assets 2,439,315   $ 2,445,024
Operating Segments | High Purity Cellulose      
Segment Reporting Information [Line Items]      
Net sales 280,945 249,761  
Operating income (loss) (7,804) 6,427  
Total identifiable assets 1,644,630   1,579,300
Operating Segments | Paperboard      
Segment Reporting Information [Line Items]      
Operating income (loss) 5,839 5,755  
Total identifiable assets 113,023   114,391
Operating Segments | High-Yield Pulp      
Segment Reporting Information [Line Items]      
Operating income (loss) (371) (541)  
Total identifiable assets 41,869   38,147
Operating Segments | Corporate      
Segment Reporting Information [Line Items]      
Operating income (loss) (13,456) (12,113)  
Operating Segments | Corporate and other      
Segment Reporting Information [Line Items]      
Total identifiable assets 639,794   $ 713,186
Eliminations      
Segment Reporting Information [Line Items]      
Net sales (5,607) (6,476)  
Cellulose Specialties | Operating Segments | High Purity Cellulose      
Segment Reporting Information [Line Items]      
Net sales 183,554 167,837  
Commodity Products | Operating Segments | High Purity Cellulose      
Segment Reporting Information [Line Items]      
Net sales 70,755 58,933  
Other sales | Operating Segments | High Purity Cellulose      
Segment Reporting Information [Line Items]      
Net sales 26,636 22,991  
Paperboard | Operating Segments | Paperboard      
Segment Reporting Information [Line Items]      
Net sales 54,237 47,849  
High-Yield Pulp | Operating Segments | High-Yield Pulp      
Segment Reporting Information [Line Items]      
Net sales $ 22,141 $ 27,544