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Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 28, 2024
Sep. 30, 2023
Sep. 28, 2024
Sep. 30, 2023
Dec. 31, 2023
Segment Reporting Information [Line Items]          
Net sales $ 401,103 $ 368,670 $ 1,207,804 $ 1,220,844  
Operating income (loss) (16,800) (14,440) 28,472 (4,302)  
Total assets 2,159,360   2,159,360   $ 2,182,700
Operating Segments | High Purity Cellulose          
Segment Reporting Information [Line Items]          
Net sales 324,814 292,016 964,174 965,579  
Operating income (loss) (5,688) (5,547) 45,215 6,965  
Total assets 1,501,493   1,501,493   1,510,076
Operating Segments | High Purity Cellulose | Cellulose Specialties          
Segment Reporting Information [Line Items]          
Net sales 220,820 164,654 638,382 570,584  
Operating Segments | High Purity Cellulose | Commodity Products          
Segment Reporting Information [Line Items]          
Net sales 78,129 98,834 253,683 321,548  
Operating Segments | High Purity Cellulose | Other sales          
Segment Reporting Information [Line Items]          
Net sales 25,865 28,528 72,109 73,447  
Operating Segments | Paperboard          
Segment Reporting Information [Line Items]          
Net sales 54,809 57,212 168,068 164,300  
Operating income (loss) 6,890 13,088 26,999 28,680  
Total assets 101,549   101,549   105,804
Operating Segments | High-Yield Pulp          
Segment Reporting Information [Line Items]          
Net sales 27,822 25,393 94,981 111,397  
Operating income (loss) 294 (6,062) 436 2,030  
Total assets 48,295   48,295   43,811
Eliminations          
Segment Reporting Information [Line Items]          
Net sales (6,342) (5,951) (19,419) (20,432)  
Corporate          
Segment Reporting Information [Line Items]          
Operating income (loss) (18,296) $ (15,919) (44,178) $ (41,977)  
Total assets $ 508,023   $ 508,023   $ 523,009