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Summary of Quarterly Results (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract] |
Schedule of quarterly financial information |
| 1st Quarter (a) |  | 2nd Quarter (b) |  | 3rd Quarter |  | 4th Quarter
2011: |  |  |  |  |  |  |
Total revenue | $ | 146,794 |  |  | $ | 144,094 |  |  | $ | 144,308 |  |  | $ | 146,609 |
Net income (loss) | (490 | ) |  | (6,234 | ) |  | 6,611 |  |  | (4,602 | )
Net income (loss) allocated to Common Shares | (439 | ) |  | (6,069 | ) |  | 6,249 |  |  | (4,240 | )
Basic earnings (loss) per Common Share | $ | (0.02 | ) |  | $ | (0.06 | ) |  | $ | 0.03 |  |  | $ | (0.05 | )
Diluted earnings (loss) per Common Share | $ | (0.02 | ) |  | $ | (0.06 | ) |  | $ | 0.03 |  |  | $ | (0.05 | )
2010: |  |  |  |  |  |  |
Total revenue | $ | 139,502 |  |  | $ | 134,191 |  |  | $ | 140,179 |  |  | $ | 146,084 |
Net loss | (399 | ) |  | (5,600 | ) |  | (6,616 | ) |  | (4,991 | )
Loss allocated to Common Shares | (348 | ) |  | (5,441 | ) |  | (6,437 | ) |  | (4,848 | )
Basic loss per Common Share | $ | (0.02 | ) |  | $ | (0.06 | ) |  | $ | (0.06 | ) |  | $ | (0.05 | )
Diluted loss per Common Share | $ | (0.02 | ) |  | $ | (0.06 | ) |  | $ | (0.06 | ) |  | $ | (0.05 | )
(a) | During the first quarter of 2011, the Company recorded additional income of $0.5 million related to electricity charges in prior years that were under-billed to a certain tenant. This resulted in the overstatement of total revenue by $0.5 million during the current year and in the understatement of total revenue by $0.3 million and $0.2 million for the years ended December 31, 2009 and 2008, respectively. As management believes that this error was not material to prior years' consolidated financial statements and that the impact of recording the error in the current year is not material to the Company's consolidated financial statements, the Company recorded the related adjustment in the current year.
(b) | The consolidated statement of operations for the second quarter of 2011 also contained an out of period depreciation and amortization expense adjustment of $4.7 million relating to intangible assets representing tenant relationships and in-place leases that should have been written off in prior periods. This resulted in the overstatement of depreciation and amortization expense by $4.7 million million in the current year. During the year ended December 31, 2010, depreciation and amortization expense was overstated by $1.7 million and was understated by $1.4 million, $1.8 million, $1.7 million and $1.5 million during the years ended December 31, 2009, 2008, 2007, and 2006, respectively. As management believes that this error was not material to prior years' consolidated financial statements and that the impact of recording the error in the current year is not material to the Company's consolidated financial statements, the Company recorded the related adjustment during the current year.

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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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