Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Components of property, plant and equipment
Land	$ 39,159	$ 39,704	$ 39,705
Land improvements and leasehold improvements	89,941	92,455	92,138
Buildings and storage facilities	368,678	379,195	375,715
Machinery and equipment	920,232	898,557	881,617
Construction in progress	24,556	19,473	20,936
Property, plant and equipment, gross	1,442,566	1,429,384	1,410,111
Less: accumulated depreciation	644,906	569,073	539,960
Property, plant and equipment, net	$ 797,660	$ 860,311	$ 870,151

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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