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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 segment | Jun. 30, 2012
Segment Reporting Information [Line Items] |  |  |  |
Number of operating segments |  |  | 1 |
Revenue | $ 20,258 | $ 24,508 | $ 44,241 | $ 50,884
Operating costs and expenses | 14,414 | 19,679 | 32,260 | 40,433
Other income (expense) | (79) | 58 | 226 | 94
Income before provision for income taxes | 5,765 | 4,887 | 12,207 | 10,545
Sales |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 3,329 | 10,649 | 11,164 | 23,080
Operating costs and expenses | 1,600 | 7,563 | 6,482 | 17,118
Other income (expense) | 0 | 0 | 0 | 0
Income before provision for income taxes | 1,729 | 3,086 | 4,682 | 5,962
Rental |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 16,721 | 13,671 | 32,728 | 27,409
Operating costs and expenses | 6,258 | 5,874 | 13,070 | 11,383
Other income (expense) | 0 | 0 | 0 | 0
Income before provision for income taxes | 10,463 | 7,797 | 19,658 | 16,026
Service & Maintenance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 208 | 188 | 349 | 395
Operating costs and expenses | 85 | 98 | 153 | 191
Other income (expense) | 0 | 0 | 0 | 0
Income before provision for income taxes | 123 | 90 | 196 | 204
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Operating costs and expenses | 6,471 | 6,144 | 12,555 | 11,741
Other income (expense) | (79) | 58 | 226 | 94
Income before provision for income taxes | $ (6,550) | $ (6,086) | $ (12,329) | $ (11,647)

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- Definition Total costs of sales and operating expenses for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 5 + Details
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- Definition The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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