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Real Estate Investments (Pro Forma Operations Data) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Supplemental Pro Forma Operating Data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro forma revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 582,642 | $ 604,440
Pro forma income (loss) from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  | (29,000) | 7,890
Pro forma net income (loss) available to common shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (24,940) | $ 2,306
Loss per common share from continuing operations : |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic - as reported |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.16) | $ (0.29) | $ (0.04)
Basic -- as pro forma |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.28) | $ 0.00
Diluted - as reported |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.16) | $ (0.29) | $ (0.04)
Diluted - as pro forma |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.28) | $ 0.00
Earnings per Common Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to common shareholders, Basic | $ (0.05) | $ 0.03 | $ (0.06) | [1] | $ (0.02) | [2] | $ (0.05) | $ (0.06) | $ (0.06) | [1] | $ (0.02) | [2] | $ (0.10) | $ (0.19) | $ 0.00
Basic -- as pro forma |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.19) | $ 0.02
Net income (loss) attributable to common shareholders, Diluted | $ (0.05) | $ 0.03 | $ (0.06) | [1] | $ (0.02) | [2] | $ (0.05) | $ (0.06) | $ (0.06) | [1] | $ (0.02) | [2] | $ (0.10) | $ (0.19) | $ 0.00
Diluted - as pro forma |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.19) | $ 0.02
[1] | 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.
[2] | 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.

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