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Property, Plant and Equipment, Net (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2013
--- | --- | --- | ---
Property, Plant and Equipment |  |  |
Property, plant and equipment, gross | $ 442,699 | $ 438,782 | $ 422,860
Less accumulated depreciation and amortization | (240,289) | (235,535) | (221,468)
Property, plant and equipment excluding capital projects in progress, net | 202,410 | 203,247 | 201,392
Capital projects in progress | 5,047 | 6,286 | 9,618
Property, plant and equipment, net | 207,457 | 209,533 | 211,010
Land |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment, gross | 29,960 | 29,347 | 30,364
Buildings and site improvements |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment, gross | 178,135 | 178,391 | 173,923
Leasehold improvements |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment, gross | 5,492 | 5,213 | 4,708
Machinery, equipment, and software |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment, gross | $ 229,112 | $ 225,831 | $ 213,865

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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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 + 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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- Definition 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. + 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 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 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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