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Segment reporting - Reconciliation of Other Segment to Consolidated Totals (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Equity in earnings of affiliates, net of tax $ 9,588 $ 10,347 $ 14,207
Depreciation, depletion and amortization 374,859 340,988 308,824
Continuing Operations      
Segment Reporting Information [Line Items]      
Equity in earnings of affiliates, net of tax 9,588 10,347 14,207
Depreciation, depletion and amortization 316,061 282,029 250,533
Operating segments      
Segment Reporting Information [Line Items]      
Equity in earnings of affiliates, net of tax 9,588 10,347 14,207
Depreciation, depletion and amortization 225,504 200,063 175,993
Operating segments | Consumer Packaging      
Segment Reporting Information [Line Items]      
Equity in earnings of affiliates, net of tax 365 564 485
Depreciation, depletion and amortization 109,355 95,340 84,049
Operating segments | Industrial Paper Packaging      
Segment Reporting Information [Line Items]      
Equity in earnings of affiliates, net of tax 9,223 9,783 13,722
Depreciation, depletion and amortization 116,149 104,723 91,944
Other      
Segment Reporting Information [Line Items]      
Equity in earnings of affiliates, net of tax 0 0 0
Depreciation, depletion and amortization $ 90,557 $ 81,966 $ 74,540