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Quarterly Financial Data (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental and other revenues | $ 128,730 | [1] | $ 122,086 | [1] | $ 117,057 | [1] | $ 114,979 | [1] | $ 117,330 | [1] | $ 115,528 | [1] | $ 113,765 | [1] | $ 114,503 | [1] | $ 482,852 | $ 461,126 | $ 448,018
Income from continuing operations | 12,850 | [1] | 5,402 | [1] | 14,143 | [1] | 12,106 | [1] | 11,153 | [1] | 8,501 | [1] | 39,811 | [1] | 11,445 | [1] | 44,501 | 70,910 | 46,458
Income from discontinued operations | 0 | [1] | 2,842 | [1] | 291 | [1] | 337 | [1] | 246 | [1] | 272 | [1] | 238 | [1] | 637 | [1] | 3,470 | 1,393 | 15,236
Net income | 12,850 |  | 8,244 |  | 14,434 |  | 12,443 |  | 11,399 |  | 8,773 |  | 40,049 |  | 12,082 |  | 47,971 | 72,303 | 61,694
Net (income) attributable to noncontrolling interests in the Operating Partnership | (595) |  | (366) |  | (623) |  | (507) |  | (501) |  | (366) |  | (1,933) |  | (520) |  | (2,091) | (3,320) | (3,197)
Net (income) attributable to noncontrolling interests in consolidated affiliates | (201) |  | (249) |  | (182) |  | (123) |  | (204) |  | 148 |  | (215) |  | (214) |  | (755) | (485) | (11)
Dividends on Preferred Stock | (627) |  | (627) |  | (1,622) |  | (1,677) |  | (1,677) |  | (1,677) |  | (1,677) |  | (1,677) |  | (4,553) | (6,708) | (6,708)
Excess of Preferred Stock redemption/repurchase over carrying value | 0 |  | 0 |  | (1,895) |  | 0 |  |  |  |  |  |  |  |  |  | (1,895) | 0 | 0
Net income available for common stockholders | 11,427 |  | 7,002 |  | 10,112 |  | 10,136 |  | 9,017 |  | 6,878 |  | 36,224 |  | 9,671 |  | 38,677 | 61,790 | 51,778
Earnings Per Share, Basic [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations available for common stockholders (in dollars per share) | $ 0.16 |  | $ 0.06 |  | $ 0.14 |  | $ 0.14 |  | $ 0.13 |  | $ 0.10 |  | $ 0.51 |  | $ 0.13 |  | $ 0.49 | $ 0.84 | $ 0.55
Income from discontinued operations available for common stockholders (in dollars per share) | $ 0.00 |  | $ 0.04 |  | $ 0.00 |  | $ 0.00 |  | $ 0.00 |  | $ 0.00 |  | $ 0.00 |  | $ 0.01 |  | $ 0.05 | $ 0.02 | $ 0.21
Net income available for common stockholders | $ 0.16 |  | $ 0.10 |  | $ 0.14 |  | $ 0.14 |  | $ 0.13 |  | $ 0.10 |  | $ 0.51 |  | $ 0.14 |  | $ 0.54 | $ 0.86 | $ 0.76
Earnings Per Share, Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations available for common stockholders (in dollars per share) | $ 0.16 |  | $ 0.06 |  | $ 0.14 |  | $ 0.14 |  | $ 0.13 |  | $ 0.10 |  | $ 0.50 |  | $ 0.13 |  | $ 0.49 | $ 0.84 | $ 0.55
Income from discontinued operations available for common stockholders (in dollars per share) | $ 0.00 |  | $ 0.04 |  | $ 0.00 |  | $ 0.00 |  | $ 0.00 |  | $ 0.00 |  | $ 0.00 |  | $ 0.01 |  | $ 0.05 | $ 0.02 | $ 0.21
Net income available for common stockholders | $ 0.16 |  | $ 0.10 |  | $ 0.14 |  | $ 0.14 |  | $ 0.13 |  | $ 0.10 |  | $ 0.50 |  | $ 0.14 |  | $ 0.54 | $ 0.86 | $ 0.76
Continuing Operations Reconciliation To Previous Reported Amounts [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental and other revenues, as reported |  |  | 122,086 |  | 117,057 |  | 115,592 |  | 117,865 |  | 115,528 |  | 113,765 |  | 115,054 |  |  |  |
Discontinued operations |  |  | 0 |  | 0 |  | (613) |  | (535) |  | 0 |  | 0 |  | (551) |  |  |  |
Rental and other revenues, as adjusted | 128,730 | [1] | 122,086 | [1] | 117,057 | [1] | 114,979 | [1] | 117,330 | [1] | 115,528 | [1] | 113,765 | [1] | 114,503 | [1] | 482,852 | 461,126 | 448,018
Income from continuing operations, as reported |  |  | 5,402 |  | 14,143 |  | 12,443 |  | 11,399 |  | 8,501 |  | 39,811 |  | 11,694 |  |  |  |
Discontinued operations |  |  | 0 |  | 0 |  | (337) |  | (246) |  | 0 |  | 0 |  | (249) |  |  |  |
Income from continuing operations, as adjusted | 12,850 | [1] | 5,402 | [1] | 14,143 | [1] | 12,106 | [1] | 11,153 | [1] | 8,501 | [1] | 39,811 | [1] | 11,445 | [1] | 44,501 | 70,910 | 46,458
Income from discontinued operations, as reported |  |  | 2,842 |  | 291 |  | 0 |  | 0 |  | 272 |  | 238 |  | 388 |  |  |  |
Additonal discontinued operations from properties sold subsequent to the respective reporting period |  |  | 0 |  | 0 |  | 337 |  | 246 |  | 0 |  | 0 |  | 249 |  |  |  |
Income from discontinued operations, as adjusted | $ 0 | [1] | $ 2,842 | [1] | $ 291 | [1] | $ 337 | [1] | $ 246 | [1] | $ 272 | [1] | $ 238 | [1] | $ 637 | [1] | $ 3,470 | $ 1,393 | $ 15,236
[1] | The amounts presented may not equal to the amounts previously reported in the most recent Form 10-Qs or prior 10-K for each period as a result of discontinued operations.

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