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Beneficiaries Equity of The Parent Company (DetailsTextuals) (USD $) | 3 Months Ended | 6 Months Ended |  |  |
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Jun. 30, 2011 | Jun. 30, 2011 | Jun. 30, 2010 | Jul. 06, 2011 | May 31, 2011 | May 02, 2006
Beneficiaries Equity of The Parent Company (Textuals) [Abstract] |  |  |  |  |  |
Redeemable limited partnership units excluded from the diluted earnings per share computations |  | 9,809,759 | 2,809,108 |  |  |
Dividend declared per common share |  |  |  |  | $ 0.15 |
Amount of dividend declared |  |  |  | $ 20,500,000 |  |
Preferential return for series C |  | 7.50% |  |  |  |
Preferential return for series D |  | 7.375% |  |  |  |
Dividend paid for series C preferred shares | 900,000 | 900,000 |  |  |  |
Dividend paid for series D preferred shares | 1,100,000 | 1,100,000 |  |  |  |
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 | $ 41,692,000 |  |  |
No 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 | 500,000 |  |  |  |

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