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Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Property, Plant and Equipment
Property, plant and equipment, gross	$ 479,264	$ 470,420	$ 449,020
Less accumulated depreciation and amortization	(279,607)	(273,302)	(264,398)
Property, plant and equipment excluding capital projects in progress, net	199,657	197,118	184,622
Capital projects in progress	50,808	35,692	32,038
Property, plant and equipment, net	250,465	232,810	216,660
Land
Property, Plant and Equipment
Property, plant and equipment, gross	32,370	32,127	30,535
Buildings and site improvements
Property, Plant and Equipment
Property, plant and equipment, gross	186,974	183,882	173,605
Leasehold improvements
Property, Plant and Equipment
Property, plant and equipment, gross	5,515	5,550	5,616
Machinery, equipment, and software
Property, Plant and Equipment
Property, plant and equipment, gross	$ 254,405	$ 248,861	$ 239,264

X

- Definition

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
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-Section S99
-Paragraph 1
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- Definition

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 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.

+ References

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