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Property, plant and equipment - Summary of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment [Abstract]    
Land $ 112,714 $ 119,262
Timber resources 42,355 42,310
Buildings 550,497 566,529
Machinery and equipment 3,179,781 3,191,008
Construction in progress 237,056 132,223
Property, plant and equipment, gross 4,122,402 4,051,332
Accumulated depreciation and depletion (2,824,902) (2,807,222)
Property, plant and equipment, net $ 1,297,500 $ 1,244,110