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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 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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6812-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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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. + 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 (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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