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Property, Plant and Equipment, net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment
Property, plant and equipment, gross	$ 550,922	$ 470,420
Less accumulated depreciation and amortization	(299,907)	(273,302)
Property, plant and equipment excluding capital projects in progress, net	251,015	197,118
Capital projects in progress	22,005	35,692
Property, plant and equipment, net	273,020	232,810
Original cost of fully depreciated assets still in use	189,900	166,700
Depreciation expense	27,300	21,600	$ 20,400
Land
Property, Plant and Equipment
Property, plant and equipment, gross	33,087	32,127
Buildings and site improvements
Property, Plant and Equipment
Property, plant and equipment, gross	212,817	183,882
Buildings and Improvements, Gross	29,000
Leasehold improvements
Property, Plant and Equipment
Property, plant and equipment, gross	4,684	5,550
Machinery and equipment
Property, Plant and Equipment
Property, plant and equipment, gross	300,334	248,861
Software development
Property, Plant and Equipment
Property, plant and equipment, gross	20,500	4,600
Capital projects in progress	12,200	$ 13,500
McKinney facility
Property, Plant and Equipment
Buildings and Improvements, Gross	$ 21,200

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- Definition

Represents the original cost of fully depreciated property, plant and equipment that are still in use.

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Represents the aggregate of long-lived physical assets excluding capital projects in progress used in the normal conduct of business and not intended for resale.

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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.

+ References

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-Publisher FASB
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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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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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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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