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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 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) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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