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Beneficiaries Equity of The Parent Company (DetailsTextuals) (USD $) | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Oct. 19, 2011 | Oct. 05, 2011 | May 02, 2006
Class of Stock [Line Items] |  |  |  |  |
Dividends paid for preferred shares | $ 5,994,000 | $ 5,994,000 |  |  |
Beneficiaries Equity of The Parent Company (Textuals) [Abstract] |  |  |  |  |
Redeemable limited partnership units excluded from the diluted earnings per share computations | 9,809,759 | 9,920,220 |  |  |
Distribution Declared per common partnership unit |  |  | $ 0.15 |  |
Amount of dividend declared |  |  |  | 20,500,000 |
Shares authorized for Equity Offering Program | 15,000,000 |  |  |  |
Maximum percentage of Gross sale price per share, compensation to sales agents | 2.00% |  |  |  |
Issuance of Common Shares of Beneficial Interest, shares | 679,285 |  |  |  |
Average sales price per share | $ 12.18 |  |  |  |
Issuance of Common Shares of Beneficial Interest | 8,272,000 | 66,927,000 |  |  |
Number of shares sold by the company | 6,421,553 |  |  |  |
Remaining shares available for sales | 8,578,447 |  |  |  |
Common partnership units issued to the parent company | 679,285 |  |  |  |
Common shares capacity restored |  |  |  |  | 3,500,000
Additional shares Expected to be purchased under program | 500,000 |  |  |  |
7.50% Series C Preferred Shares [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Dividends paid for preferred shares | 900,000 |  |  |  |
Percentage of Preferential return | 7.50% |  |  |  |
7.375% Series D Preferred Shares [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Dividends paid for preferred shares | $ 1,100,000 |  |  |  |
Percentage of Preferential return | 7.375% |  |  |  |

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