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Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Property, Plant and Equipment
Property, plant and equipment, gross	$ 530,788	$ 470,420	$ 461,556
Less accumulated depreciation and amortization	(297,321)	(273,302)	(275,096)
Property, plant and equipment excluding capital projects in progress, net	233,467	197,118	186,460
Capital projects in progress	31,711	35,692	43,210
Property, plant and equipment, net	265,178	232,810	229,670
Land
Property, Plant and Equipment
Property, plant and equipment, gross	33,030	32,127	30,217
Buildings and site improvements
Property, Plant and Equipment
Property, plant and equipment, gross	201,877	183,882	176,430
Leasehold improvements
Property, Plant and Equipment
Property, plant and equipment, gross	5,911	5,550	5,682
Machinery, equipment, and software
Property, Plant and Equipment
Property, plant and equipment, gross	$ 289,970	$ 248,861	$ 249,227

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- 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
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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 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.

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