Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Components of property, plant and equipment
Land	$ 23,380us-gaap_Land	$ 23,380us-gaap_Land	$ 21,906us-gaap_Land
Land improvements and leasehold improvements	73,651	71,817	67,876
Buildings and storage facilities	274,877us-gaap_BuildingsAndImprovementsGross	275,059us-gaap_BuildingsAndImprovementsGross	234,109us-gaap_BuildingsAndImprovementsGross
Machinery and equipment	340,109us-gaap_MachineryAndEquipmentGross	333,559us-gaap_MachineryAndEquipmentGross	309,283us-gaap_MachineryAndEquipmentGross
Software	68,193	55,436	13,403
Construction in progress	18,354us-gaap_ConstructionInProgressGross	29,620us-gaap_ConstructionInProgressGross	52,200us-gaap_ConstructionInProgressGross
Property, plant and equipment, gross	798,564us-gaap_PropertyPlantAndEquipmentGross	788,871us-gaap_PropertyPlantAndEquipmentGross	698,777us-gaap_PropertyPlantAndEquipmentGross
Less: accumulated depreciation and amortization	346,926	335,264	312,645
Property, plant and equipment, net	$ 451,638us-gaap_PropertyPlantAndEquipmentNet	$ 453,607us-gaap_PropertyPlantAndEquipmentNet	$ 386,132us-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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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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