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Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2011
Quarterly Financial Data [Abstract] |
Quarterly Financial Data | 17. Quarterly Financial Data (unaudited) Summarized quarterly financial data, which has been adjusted for discontinued operations as discussed in Note 7, "Property Acquisitions, Discontinued Operations, Assets Held for Sale and Impairments," for the years ended December 31, 2011 and 2010, is as follows:
|  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |
(in thousands, except per share amounts) |  | First |  |  | Second |  |  | Third |  |  | Fourth |  |  | Total(a) |
2011: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 158,865 |  |  | $ | 162,750 |  |  | $ | 166,541 |  |  | $ | 167,712 |  |  | $ | 655,868 |
Net income (loss) attributable to common shareholders |  |  | 7,286 |  |  |  | (16,597 | ) |  |  | 11,840 |  |  |  | 46,850 |  |  |  | 49,379 |
Net income (loss) attributable to common shareholders per share – basic |  |  | 0.10 |  |  |  | (0.23 | )(b) |  |  | 0.16 |  |  |  | 0.63 | (c) |  |  | 0.67 |
Net income (loss) attributable to common shareholders per share – diluted |  |  | 0.10 |  |  |  | (0.23 | )(b) |  |  | 0.16 |  |  |  | 0.62 | (c) |  |  | 0.66 |
2010: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 147,218 |  |  | $ | 149,049 |  |  | $ | 152,037 |  |  | $ | 153,146 |  |  | $ | 601,450 |
Net income attributable to common shareholders |  |  | 2,285 |  |  |  | 2,134 |  |  |  | 1,650 |  |  |  | 17,147 |  |  |  | 23,216 |
Net income attributable to common shareholders per share – basic |  |  | 0.03 |  |  |  | 0.03 |  |  |  | 0.02 |  |  |  | 0.24 | (d) |  |  | 0.33 |
Net income attributable to common shareholders per share – diluted |  |  | 0.03 |  |  |  | 0.03 |  |  |  | 0.02 |  |  |  | 0.24 | (d) |  |  | 0.33 |
(a) | Net income per share is computed independently for each of the quarters presented. Therefore, the sum of quarterly net income (loss) per share amounts may not equal the total computed for the year.
(b) | Includes a $29,791 loss, or $0.41 basic and diluted per share, impact related to a loss on discontinuation of a hedging relationship.
(c) | Includes a $24,621, or $0.33 basic and diluted per share, impact related to the gain on sale of discontinued operations.
(d) | Includes a $9,614, or $0.14 basic and $0.13 diluted per share, impact related to the gain on sale of discontinued 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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