Plant, Equipment and Timberlands - Summary of Plant, Equipment and Timberlands (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Accumulated depreciation	$ (696,928)	$ (645,404)
Subtotal	631,230	637,636
Construction in progress	31,686	38,175
Total	662,916	675,811	$ 758,812
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	24,145	23,718
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	233,048	228,310
Machinery, equipment & other
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,070,965	$ 1,031,012