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Property and Equipment | 12 Months Ended
--- | ---
Dec. 31, 2012
Property and Equipment |
Property and Equipment | 4. Property and Equipment The amount of property and equipment and their respective estimated useful lives are as follows (in thousands, except estimated useful lives):
|  | As of December 31, |  |
--- | --- | --- | --- | ---
|  | Estimated Useful Lives
|  | 2012 |  | 2011
Land |  | $ | 4,653 |  | $ | 5,008 |  | Indefinite
Buildings and leasehold improvements |  |  | 21,081 |  |  | 14,640 |  | 3 - 15 years
Office equipment, furniture and fixtures |  |  | 8,415 |  |  | 6,467 |  | 3 - 7 years
Computer equipment and software costs |  |  | 80,233 |  |  | 67,498 |  | 3 - 9 years
Machinery, equipment and vehicles |  |  | 66,122 |  |  | 48,318 |  | 3 - 30 years
|  |  | 180,504 |  |  | 141,931 |  |
Accumulated depreciation and amortization |  |  | 67,979 |  |  | 51,221 |  |
|  | $ | 112,525 |  | $ | 90,710 |  |
For 2012, 2011 and 2010, we recorded depreciation expense of $18.6 million, $15.5 million and $9.3 million, respectively. The amount of computer software costs, including capitalized internally developed software costs are as follows (in thousands):
As of December 31, |
--- | ---
|  | 2012 |  | 2011 |
Computer software costs |  | $ | 60,465 |  | $ | 50,592 |
Accumulated amortization |  |  | 27,710 |  |  | 20,481 |
Computer software costs, net |  | $ | 32,755 |  | $ | 30,111 |
Included in capitalized computer software costs are costs incurred in connection with software development in progress of $3.0 million and $7.7 million as of December 31, 2012 and 2011, respectively. For 2012, 2011 and 2010, we recorded amortization expense related to computer software costs of $7.2 million, $6.1 million and $4.2 million, respectively. The assets and accumulated amortization recorded under capital leases are as follows (in thousands):
As of December 31, |
--- | ---
|  | 2012 |  | 2011 |
Capital leases |  | $ | 4,489 |  | $ | 4,236 |
Accumulated amortization |  |  | 816 |  |  | 713 |
Capital leases, net |  | $ | 3,673 |  | $ | 3,523 |

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- Definition The entire disclosure for long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. This disclosure may include property plant and equipment accounting policies and methodology, a schedule of property, plant and equipment gross, additions, deletions, transfers and other changes, depreciation, depletion and amortization expense, net, accumulated depreciation, depletion and amortization expense and useful lives, 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 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 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 210.5-02.13-14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: 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 5: 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 + Details
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