Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Components of property, plant and equipment
Land	$ 23,380us-gaap_Land	$ 21,801us-gaap_Land
Land improvements and leasehold improvements	71,817	67,153
Buildings and storage facilities	275,059us-gaap_BuildingsAndImprovementsGross	231,976us-gaap_BuildingsAndImprovementsGross
Machinery and equipment	333,559us-gaap_MachineryAndEquipmentGross	308,215us-gaap_MachineryAndEquipmentGross
Software	55,436	13,351
Construction in progress	29,620us-gaap_ConstructionInProgressGross	48,135us-gaap_ConstructionInProgressGross
Property, plant and equipment, gross	788,871us-gaap_PropertyPlantAndEquipmentGross	690,631us-gaap_PropertyPlantAndEquipmentGross
Less: accumulated depreciation and amortization	335,264	303,173
Property, plant and equipment, net	$ 453,607us-gaap_PropertyPlantAndEquipmentNet	$ 387,458us-gaap_PropertyPlantAndEquipmentNet

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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- Definition

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 before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software.

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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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