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Property and equipment (Tables) | 6 Months Ended
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Jun. 30, 2015
Property and Equipment | Property and equipment — net consist of the following (dollar amounts in thousands):
|  | Estimated Useful Life (Years) |  |  | June 30, 2015 |  |  | December 31, 2014 |
Land |  |  | — |  |  | $ | 5,273 |  |  | $ | 5,273 |
Buildings |  |  | 39-40 |  |  |  | 54,948 |  |  |  | 54,948 |
Building improvements |  |  | 5-40 |  |  |  | 131,300 |  |  |  | 114,131 |
Machinery and equipment |  |  | 3-15 |  |  |  | 102,996 |  |  |  | 80,919 |
Furniture, fixtures and office equipment |  |  | 5-10 |  |  |  | 5,015 |  |  |  | 5,015 |
Computer equipment and software |  |  | 3 |  |  |  | 10,355 |  |  |  | 10,465 |
Leasehold improvements |  |  | 4 |  |  |  | 17 |  |  |  | 17 |
Construction in progress |  |  |  |  |  |  | 7,118 |  |  |  | 39,580 |
|  |  |  |  |  |  | 317,022 |  |  |  | 310,348 |
Less accumulated depreciation and amortization |  |  |  |  |  |  | (123,154 | ) |  |  | (118,221 | )
Property and equipment — net |  |  |  |  |  | $ | 193,868 |  |  | $ | 192,127 |
Depreciation and Amortization Expense Related to Property and Equipment | Depreciation and amortization expense related to property and equipment for the three and six months ended June 30, 2015 and 2014 was as follows (in thousands):
|  | Three months ended June 30, |  |  | Six months ended June 30, |
|  | 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
Depreciation and amortization expense |  | $ | 2,740 |  |  | $ | 2,449 |  |  | $ | 5,117 |  |  | $ | 4,972 |

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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 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 2: 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 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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