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Segment and Geographical Information - Significant Operating Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 28, 2024
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Product Information [Line Items]          
Key input costs (wood, chemicals, energy)     $ 698,118 $ 771,109 $ 841,676
Freight     116,274 130,833 146,022
Depreciation and amortization     126,124 133,473 123,437
Fixed and other general costs     524,210 519,761 483,049
Cost of sales     1,464,726 1,555,176 1,594,184
Selling, general and administrative expense     92,258 75,712 91,475
Asset impairment $ 25,000 $ 62,000 25,169 62,300 0
Indefinite suspension charges     16,630 0 0
Other operating (income) expense     (7,956) 15,406 5,473
Total assets   2,182,700 2,129,657 2,182,700  
Depreciation and amortization     137,173 139,983 134,576
Capital expenditures     117,150 133,143 146,279
Operating Segments | High Purity Cellulose          
Product Information [Line Items]          
Key input costs (wood, chemicals, energy)     535,055 607,773 659,855
Freight     75,382 83,390 93,952
Depreciation and amortization     115,963 125,522 115,117
Fixed and other general costs     443,086 454,306 409,587
Cost of sales     1,169,486 1,270,991 1,278,511
Selling, general and administrative expense     20,515 18,243 19,683
Asset impairment     25,169 62,300  
Indefinite suspension charges     16,630    
Other operating (income) expense     (5,771) 2,797 6,154
Total assets   1,510,076 1,503,268 1,510,076  
Depreciation and amortization     117,749 122,925 117,017
Capital expenditures     100,797 118,665 136,866
Operating Segments | Paperboard          
Product Information [Line Items]          
Key input costs (wood, chemicals, energy)     117,393 113,678 135,128
Freight     20,512 18,131 22,434
Depreciation and amortization     7,832 5,848 5,998
Fixed and other general costs     41,802 35,021 39,967
Cost of sales     187,539 172,678 203,527
Selling, general and administrative expense     11,021 9,570 9,471
Asset impairment     0 0  
Indefinite suspension charges     0    
Other operating (income) expense     (2,363) 0 11
Total assets   105,804 93,600 105,804  
Depreciation and amortization     14,701 12,933 13,130
Capital expenditures     5,644 776 3,413
Operating Segments | High-Yield Pulp          
Product Information [Line Items]          
Key input costs (wood, chemicals, energy)     71,890 75,144 75,609
Freight     20,380 29,312 29,636
Depreciation and amortization     2,329 2,103 2,322
Fixed and other general costs     38,589 29,402 32,814
Cost of sales     133,188 135,961 140,381
Selling, general and administrative expense     2,912 2,893 3,084
Asset impairment     0 0  
Indefinite suspension charges     0    
Other operating (income) expense     (1,609) 255 40
Total assets   43,811 49,798 43,811  
Depreciation and amortization     2,451 2,025 2,364
Capital expenditures     2,156 1,421 2,210
Corporate and Eliminations          
Product Information [Line Items]          
Key input costs (wood, chemicals, energy)     (26,220) (25,486) (28,916)
Freight     0 0 0
Depreciation and amortization     0 0 0
Fixed and other general costs     733 1,032 681
Cost of sales     (25,487) (24,454) (28,235)
Selling, general and administrative expense     57,810 45,006 59,237
Asset impairment     0 0  
Indefinite suspension charges     0    
Other operating (income) expense     1,787 12,354 (732)
Total assets   $ 523,009 482,991 523,009  
Depreciation and amortization     2,272 2,100 2,065
Capital expenditures     $ 8,553 $ 12,281 $ 3,790