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Property and Equipment | 12 Months Ended
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Dec. 31, 2015
Property, Plant and Equipment [Abstract] |
Property and Equipment | Property and Equipment Property and equipment are as follows (in thousands):
| December 31
| 2015 |  | 2014
Land | $ | 7,145 |  |  | $ | 6,780 |
Buildings and leasehold improvements | 34,351 |  |  | 33,765 |
Machinery, equipment and rental tools | 85,611 |  |  | 80,731 |
Equipment in progress | 12,304 |  |  | 7,299 |
Furniture and fixtures | 2,749 |  |  | 2,528 |
Transportation equipment | 7,462 |  |  | 6,566 |
Computer equipment and software | 11,382 |  |  | 7,605 |
Property and equipment | 161,004 |  |  | 145,274 |
Less accumulated depreciation | (69,091 | ) |  | (59,163 | )
Property and equipment, net | $ | 91,913 |  |  | $ | 86,111 |
Depreciation expense, including expense recorded in cost of revenue, totaled $13.2 million, $13.1 million, and $11.2 million for the years ended December 31, 2015, 2014, and 2013, respectively. During the year ended December 31, 2015, an impairment of $2.3 million was recognized related to rental equipment. No impairments were recognized in 2014 and 2013 related to property and equipment.

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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 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 2: 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=51717284&loc=d3e1361-107760 Reference 3: 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=51719941&loc=d3e2921-110230 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 + Details
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