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v3.25.0.1

Segment and Geographical Information - Net Sales and Operating Income (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] |  |  |  |  |
Net sales |  |  | $ 1,630,308 | $ 1,643,330 | $ 1,717,267
Operating income (loss) |  |  | 39,481 | (65,264) | 26,135
Asset impairment | $ 25,000 | $ 62,000 | 25,169 | 62,300 | 0
Operating Segments | High Purity Cellulose |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Net sales |  |  | 1,301,622 | 1,312,764 | 1,335,846
Operating income (loss) |  |  | 75,593 | (41,567) | 31,498
Asset impairment |  |  | 25,169 | 62,300 |
Operating Segments | High Purity Cellulose | Cellulose Specialties |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Net sales |  |  | 871,752 | 783,424 | 866,225
Operating Segments | High Purity Cellulose | Commodity Products |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Net sales |  |  | 341,128 | 431,902 | 354,612
Operating Segments | High Purity Cellulose | Other sales |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Net sales |  |  | 88,742 | 97,438 | 115,009
Operating Segments | Paperboard |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Net sales |  |  | 227,628 | 219,408 | 250,167
Operating income (loss) |  |  | 31,431 | 37,160 | 37,158
Asset impairment |  |  | 0 | 0 |
Operating Segments | High-Yield Pulp |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Net sales |  |  | 126,897 | 135,954 | 159,704
Operating income (loss) |  |  | (7,594) | (3,155) | 16,199
Asset impairment |  |  | 0 | 0 |
Eliminations |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Net sales |  |  | (25,839) | (24,796) | (28,450)
Corporate |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Operating income (loss) |  |  | $ (59,949) | $ (57,702) | $ (58,720)

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