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Unaudited Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information [Table Text Block] |
| 2012
| 3/31/2012 |  | 6/30/2012 |  | 9/30/2012 |  | 12/31/2012
Total gross revenues(1) | $ | 79,123 |  |  | $ | 82,750 |  |  | $ | 87,473 |  |  | $ | 95,533 |
Net income (loss) | $ | 5,478 |  |  | $ | 5,626 |  |  | $ | 175,289 |  |  | $ | (1,755 | )
Net income (loss) attributable to common shareholders | $ | (2,187 | ) |  | $ | (3,392 | ) |  | $ | 168,950 |  |  | $ | (7,039 | )
Net income (loss) attributable to common shareholders - basic per share | $ | (0.01 | ) |  | $ | (0.02 | ) |  | $ | 1.09 |  |  | $ | (0.04 | )
Net income (loss) attributable to common shareholders - diluted per share | $ | (0.01 | ) |  | $ | (0.02 | ) |  | $ | 0.96 |  |  | $ | (0.04 | )
| 2011
| 3/31/2011 |  | 6/30/2011 |  | 9/30/2011 |  | 12/31/2011
Total gross revenues(1) | $ | 77,290 |  |  | $ | 77,474 |  |  | $ | 79,492 |  |  | $ | 79,570 |
Net income (loss) | $ | (15,993 | ) |  | $ | (56,957 | ) |  | $ | (30,844 | ) |  | $ | 14,016 |
Net income (loss) attributable to common shareholders | $ | (23,638 | ) |  | $ | (50,539 | ) |  | $ | (37,048 | ) |  | $ | 7,504 |
Net income (loss) attributable to common shareholders - basic per share per share | $ | (0.16 | ) |  | $ | (0.33 | ) |  | $ | (0.24 | ) |  | $ | 0.05 |
Net income (loss) attributable to common shareholders - diluted per share per share | $ | (0.16 | ) |  | $ | (0.33 | ) |  | $ | (0.24 | ) |  | $ | 0.05 |
_____________ (1) All periods have been adjusted to reflect the impact of properties sold during the years ended December 31, 2012 and 2011, and properties classified as held for sale, which are reflected in discontinued operations in the Consolidated Statements of Operations.

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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 -Topic 270 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (a)-(j) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6952194&loc=d3e1280-108306 + Details
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