Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
Components of property, plant and equipment
Land	$ 38,630	$ 39,162	$ 39,367
Land improvements and leasehold improvements	91,542	91,122	93,166
Buildings and storage facilities	370,453	368,577	377,946
Machinery and equipment	949,142	936,476	921,190
Construction in progress	31,237	20,676	19,723
Property, plant and equipment, gross	1,481,004	1,456,013	1,451,392
Less: accumulated depreciation	717,561	669,984	627,829
Property, plant and equipment, net	$ 763,443	$ 786,029	$ 823,563

Land improvements and leasehold improvements, gross.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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Amount before accumulated depreciation of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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