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Property, plant and equipment (Tables) | 6 Months Ended
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Jun. 30, 2014
Summary of Property, Plant and Equipment (at Cost) | Property, plant and equipment (at cost) at June 30, 2014 and December 31, 2013 consists of the following:
|  | June 30, 2014 |  |  | December 31, 2013 |
Land |  | $ | 2,458 |  |  | $ | 2,458 |
Buildings and improvements |  |  | 14,355 |  |  |  | 14,167 |
Machinery and equipment |  |  | 105,815 |  |  |  | 94,184 |
Office furniture, fixtures and equipment |  |  | 9,980 |  |  |  | 9,717 |
Automotive equipment |  |  | 288 |  |  |  | 278 |
Construction in progress |  |  | 2,477 |  |  |  | 10,615 |
|  |  | 135,373 |  |  |  | 131,419 |
Less accumulated depreciation |  |  | (83,752 | ) |  |  | (78,951 | )
|  | $ | 51,621 |  |  | $ | 52,468 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 + Details
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