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Property, Plant and Equipment, net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment
Property, plant and equipment, gross	$ 470,420	$ 438,708
Less accumulated depreciation and amortization	(273,302)	(257,115)
Property, plant and equipment excluding capital projects in progress, net	197,118	181,593
Capital projects in progress	35,692	32,123
Property, plant and equipment, net	232,810	213,716
Original cost of fully depreciated assets still in use	166,700	156,700
Depreciation expense	21,600	20,400	$ 20,400
Payments to Acquire Manufacturing Facility		12,600
Buildings and Improvements, Gross		7,300
Estimated Building Improvements Minimum	17,000
Estimated Building Improvements Maximum	19,000
Land
Property, Plant and Equipment
Property, plant and equipment, gross	32,127	28,698
Buildings and site improvements
Property, Plant and Equipment
Property, plant and equipment, gross	183,882	171,890
Leasehold improvements
Property, Plant and Equipment
Property, plant and equipment, gross	5,550	5,560
Machinery and equipment
Property, Plant and Equipment
Property, plant and equipment, gross	248,861	232,560
Software development
Property, Plant and Equipment
Property, plant and equipment, gross	4,600	1,600
Capital projects in progress	$ 13,500	$ 12,200

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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.

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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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