Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Components of property, plant and equipment
Land	$ 39,241	$ 29,739	$ 29,579
Land improvements and leasehold improvements	84,127	68,826	68,384
Buildings and storage facilities	327,418	284,998	280,226
Machinery and equipment	514,030	393,640	377,202
Construction in progress	164,532	102,394	37,456
Property, plant and equipment, gross	1,129,348	879,597	792,847
Less: accumulated depreciation	433,521	402,886	384,272
Property, plant and equipment, net	$ 695,827	$ 476,711	$ 408,575

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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