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Quarterly Financial Data | 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 The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section G -Subsection 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e725-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 28 -Paragraph 23, 24 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e765-108305 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 28 -Paragraph 30 -Subparagraph a-j -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 302 -Paragraph a Reference 7: 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=6952194&loc=d3e1280-108306 + Details
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