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Property and equipment | 6 Months Ended
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Jun. 30, 2013
Property and equipment | 6. Property and equipment Property and equipment — net consist of the following (dollar amounts in thousands):
|  | Estimated Useful Life (Years) |  |  | June 30, 2013 |  |  | December 31, 2012 |
Land |  |  | — |  |  | $ | 5,273 |  |  | $ | 5,273 |
Buildings |  |  | 39-40 |  |  |  | 54,948 |  |  |  | 54,948 |
Building improvements |  |  | 5-40 |  |  |  | 114,245 |  |  |  | 114,245 |
Machinery and equipment |  |  | 3-15 |  |  |  | 81,368 |  |  |  | 81,382 |
Furniture, fixtures and office equipment |  |  | 5-10 |  |  |  | 5,164 |  |  |  | 5,239 |
Computer equipment and software |  |  | 3 |  |  |  | 11,834 |  |  |  | 11,840 |
Leasehold improvements |  |  |  |  |  |  | 17 |  |  |  | 17 |
Construction in progress |  |  |  |  |  |  | 13,757 |  |  |  | 12,266 |
|  |  |  |  |  |  | 286,606 |  |  |  | 285,210 |
Less accumulated depreciation and amortization |  |  |  |  |  |  | (107,039 | ) |  |  | (101,249 | )
Property and equipment — net |  |  |  |  |  | $ | 179,567 |  |  | $ | 183,961 |
Leasehold improvements are amortized over four years which is the shorter of the term of the lease or the service lives of the improvements. Depreciation and amortization expense related to property and equipment for the three and six months ended June 30, 2013 and 2012 was as follows (in thousands):
|  | Three months ended June 30, |  |  | Six months ended June 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Depreciation and amortization expense |  | $ | 2,956 |  |  | $ | 3,304 |  |  | $ | 5,946 |  |  | $ | 6,661 |

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + 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 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13-14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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