v3.25.2
Segments - Assets (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 28, 2025
Jun. 29, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]      
Total assets $ 1,754,968   $ 2,129,657
Capital expenditures 62,221 $ 58,599  
Shared Cellulose Specialties and Commodity Products      
Segment Reporting Information [Line Items]      
Total assets 1,100,000   1,000,000
Capital expenditures 54,000 36,000  
Operating Segments | Cellulose Specialties      
Segment Reporting Information [Line Items]      
Total assets 176,801   214,659
Capital expenditures 0 0  
Operating Segments | Cellulose Commodities      
Segment Reporting Information [Line Items]      
Total assets 170,177   187,996
Capital expenditures 1,537 6,904  
Operating Segments | Biomaterials      
Segment Reporting Information [Line Items]      
Total assets 89,373   78,006
Capital expenditures 1,429 7,590  
Operating Segments | Paperboard      
Segment Reporting Information [Line Items]      
Total assets 96,969   93,600
Capital expenditures 1,502 1,655  
Operating Segments | High-Yield Pulp      
Segment Reporting Information [Line Items]      
Total assets 46,505   49,798
Capital expenditures 1,895 962  
Shared/Corporate      
Segment Reporting Information [Line Items]      
Total assets 1,175,143   $ 1,505,597
Capital expenditures $ 55,858 $ 41,488