v3.25.2
Segment- Significant Operating Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 28, 2025
Jun. 29, 2024
Jun. 28, 2025
Jun. 29, 2024
Segment Reporting Information [Line Items]        
Net sales $ 340,048 $ 419,045 $ 696,015 $ 806,701
Key input costs (wood, chemicals, energy) 141,758 181,447 299,291 352,656
Freight 24,873 29,791 52,123 58,480
Depreciation and amortization 28,143 31,482 57,326 60,847
Fixed and other general costs 121,633 128,016 239,580 249,648
Total cost of sales 316,407 370,736 648,320 721,631
Selling, general and administrative expense 17,965 21,809 41,224 42,884
Indefinite suspension charges 229 6,626 634 6,626
Other operating expense (income), net 6,786 (8,323) 22,269 (9,712)
Operating income (loss) (1,339) 28,197 (16,432) 45,272
Total depreciation and amortization 31,187 33,511 62,438 66,794
Operating Segments | Cellulose Specialties        
Segment Reporting Information [Line Items]        
Net sales 207,682 240,642 408,790 445,994
Key input costs (wood, chemicals, energy) 81,770 90,517 161,206 171,034
Freight 9,365 11,087 18,653 20,895
Depreciation and amortization 16,705 17,966 31,883 33,761
Fixed and other general costs 67,121 69,571 128,792 128,590
Total cost of sales 174,961 189,141 340,534 354,280
Selling, general and administrative expense 3,414 2,928 7,432 5,588
Indefinite suspension charges 0 0 0 0
Other operating expense (income), net 761 (893) 1,002 (842)
Operating income (loss) 28,546 49,466 59,822 86,968
Total depreciation and amortization 16,798 18,578 31,650 35,807
Operating Segments | Biomaterials        
Segment Reporting Information [Line Items]        
Net sales 6,531 7,790 13,452 14,577
Key input costs (wood, chemicals, energy) 1,362 1,587 2,587 2,707
Freight 527 858 1,055 1,735
Depreciation and amortization 579 657 1,099 757
Fixed and other general costs 1,708 2,968 3,239 5,668
Total cost of sales 4,176 6,070 7,980 10,867
Selling, general and administrative expense 1,308 289 2,667 570
Indefinite suspension charges 0 0 0 0
Other operating expense (income), net 57 (4) 71 (25)
Operating income (loss) 990 1,435 2,734 3,165
Total depreciation and amortization 754 653 1,235 748
Operating Segments | Cellulose Commodities        
Segment Reporting Information [Line Items]        
Net sales 59,443 85,458 134,498 180,731
Key input costs (wood, chemicals, energy) 27,482 49,135 66,374 99,667
Freight 4,407 7,410 10,737 14,823
Depreciation and amortization 7,438 10,807 17,136 22,285
Fixed and other general costs 27,751 34,787 57,462 76,834
Total cost of sales 67,078 102,139 151,709 213,609
Selling, general and administrative expense 1,287 1,893 3,671 4,177
Indefinite suspension charges 229 6,626 634 6,626
Other operating expense (income), net 562 (4,461) 922 (4,451)
Operating income (loss) (9,713) (20,739) (22,438) (39,230)
Total depreciation and amortization 7,178 9,796 16,928 21,520
Operating Segments | Paperboard        
Segment Reporting Information [Line Items]        
Net sales 46,451 60,299 95,644 113,259
Key input costs (wood, chemicals, energy) 22,695 31,025 49,377 58,024
Freight 4,617 5,176 9,465 10,023
Depreciation and amortization 2,904 1,494 6,132 2,897
Fixed and other general costs 14,122 10,276 26,859 19,660
Total cost of sales 44,338 47,971 91,833 90,604
Selling, general and administrative expense 2,637 2,461 5,514 4,879
Indefinite suspension charges 0 0 0 0
Other operating expense (income), net 0 (2,333) 471 (2,333)
Operating income (loss) (524) 12,200 (2,174) 20,109
Total depreciation and amortization 5,382 3,206 10,634 6,436
Operating Segments | High-Yield Pulp        
Segment Reporting Information [Line Items]        
Net sales 28,858 32,833 60,347 67,159
Key input costs (wood, chemicals, energy) 17,134 17,708 36,274 36,676
Freight 5,957 5,260 12,213 11,004
Depreciation and amortization 517 558 1,076 1,147
Fixed and other general costs 11,410 9,310 23,476 18,198
Total cost of sales 35,018 32,836 73,039 67,025
Selling, general and administrative expense 717 767 1,330 1,575
Indefinite suspension charges 0 0 0 0
Other operating expense (income), net 9 (1,583) 9 (1,583)
Operating income (loss) (6,886) 813 (14,031) 142
Total depreciation and amortization 546 563 1,121 1,119
Corporate And Eliminations        
Segment Reporting Information [Line Items]        
Net sales (8,917) (7,977) (16,716) (15,019)
Key input costs (wood, chemicals, energy) (8,685) (8,525) (16,527) (15,452)
Freight 0 0 0 0
Depreciation and amortization 0 0 0 0
Fixed and other general costs (479) 1,104 (248) 698
Total cost of sales (9,164) (7,421) (16,775) (14,754)
Selling, general and administrative expense 8,602 13,471 20,610 26,095
Indefinite suspension charges 0 0 0 0
Other operating expense (income), net 5,397 951 19,794 (478)
Operating income (loss) (13,752) (14,978) (40,345) (25,882)
Total depreciation and amortization $ 529 $ 715 $ 870 $ 1,164