Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Components of property, plant and equipment
Land	$ 39,393	$ 29,739	$ 29,545
Land improvements and leasehold improvements	95,720	68,826	68,859
Buildings and storage facilities	354,625	284,998	282,826
Machinery and equipment	608,831	393,640	380,109
Construction in progress	54,163	102,394	65,539
Property, plant and equipment, gross	1,152,732	879,597	826,878
Less: accumulated depreciation	449,336	402,886	392,373
Property, plant and equipment, net	$ 703,396	$ 476,711	$ 434,505

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