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Selected Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information | financial data by quarter for each of the three months in the years ended December 31, 2012 and 2011 were as follows(in thousands, except for per share data):
| Quarter(1)(2) |
| First |  | Second |  | Third |  | Fourth |
2012 |  |  |  |  |  |  |  |
Real estate rental revenue | $ | 75,214 |  |  | $ | 75,590 |  |  | $ | 77,108 |  |  | $ | 77,071 |  |
Income from continuing operations | $ | 4,834 |  |  | $ | 5,694 |  |  | $ | 5,323 |  |  | $ | 1,248 |  |
Effect of disposal of industrial segment on net income | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |
Net income | $ | 5,181 |  |  | $ | 6,008 |  |  | $ | 9,561 |  |  | $ | 2,958 |  | (3)
Net income attributable to the controlling interests | $ | 5,181 |  |  | $ | 6,008 |  |  | $ | 9,561 |  |  | $ | 2,958 |  |
Income from continuing operations per share |  |  |  |  |  |  |  |
Basic | $ | 0.07 |  |  | $ | 0.08 |  |  | $ | 0.08 |  |  | $ | 0.02 |  |
Diluted | $ | 0.07 |  |  | $ | 0.08 |  |  | $ | 0.08 |  |  | $ | 0.02 |  |
Net income per share |  |  |  |  |  |  |  |
Basic | $ | 0.08 |  |  | $ | 0.09 |  |  | $ | 0.14 |  |  | $ | 0.04 |  |
Diluted | $ | 0.08 |  |  | $ | 0.09 |  |  | $ | 0.14 |  |  | $ | 0.04 |  |
2011 |  |  |  |  |  |  |  |
Real estate rental revenue | $ | 67,872 |  |  | $ | 70,321 |  |  | $ | 70,550 |  |  | $ | 75,413 |  |
Income (loss) from continuing operations | $ | 1,708 |  |  | $ | 3,963 |  |  | $ | 2,275 |  |  | $ | (10,844 | ) | (3)
Effect of disposal of industrial segment on net income | $ | 5,719 |  |  | $ | 5,978 |  |  | $ | 4,388 |  |  | $ | 399 |  |
Net income | $ | 4,688 |  |  | $ | 6,556 |  |  | $ | 63,036 |  |  | $ | 31,098 |  |
Net income attributable to the controlling interests | $ | 4,665 |  |  | $ | 6,522 |  |  | $ | 63,008 |  |  | $ | 30,689 |  |
Income (loss) from continuing operations per share |  |  |  |  |  |  |  |
Basic | $ | 0.03 |  |  | $ | 0.08 |  |  | $ | 0.03 |  |  | $ | (0.16 | ) |
Diluted | $ | 0.03 |  |  | $ | 0.08 |  |  | $ | 0.03 |  |  | $ | (0.16 | ) |
Net income per share |  |  |  |  |  |  |  |
Basic | $ | 0.07 |  |  | $ | 0.10 |  |  | $ | 0.95 |  |  | $ | 0.46 |  |
Diluted | $ | 0.07 |  |  | $ | 0.10 |  |  | $ | 0.95 |  |  | $ | 0.46 |  |
(1) | With regard to per share calculations, the sum of the quarterly results may not equal full year results due to rounding.
(2) | The prior quarter results have been restated to conform to the current quarter presentation. Specifically, results related to properties sold or held for sale have been reclassified into discontinued operations.
(3) | The three months ended December 31, 2012 and 2011 include the impact of real estate impairments of $2.1 million and $14.5 million, respectively.

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=20225539&loc=d3e1280-108306 + Details
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