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Beneficiaries Equity of The Parent Company (DetailsTextuals) (USD $) | 3 Months Ended |  | 3 Months Ended | 0 Months Ended | 3 Months Ended | 0 Months Ended |  |  | 3 Months Ended | 25 Months Ended
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Mar. 31, 2012 | Mar. 31, 2011 | May 02, 2006 | Mar. 31, 2012 7.50% Series C Preferred Shares | Apr. 16, 2012 7.50% Series C Preferred Shares Dividend Paid | Mar. 31, 2012 7.375% Series D Preferred Shares | Apr. 16, 2012 7.375% Series D Preferred Shares Dividend Paid | Apr. 19, 2012 7.375% Series D Preferred Shares Dividend Paid | Apr. 05, 2012 7.375% Series D Preferred Shares Dividend Paid | Mar. 31, 2012 Offering Program [Member] | Mar. 31, 2011 Offering Program [Member] | Mar. 31, 2012 Offering Program [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Preferential return |  |  |  | 7.50% |  | 7.375% |  |  |  |  |  |
Dividends paid for preferred shares | $ 1,998,000 | $ 1,998,000 |  |  | $ 900,000 |  | $ 1,100,000 |  |  |  |  |
Beneficiaries Equity of The Parent Company (Textuals) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share | 2,657,721 | 9,902,752 |  |  |  |  |  |  |  |  |  |
Distribution Declared per common partnership unit |  |  |  |  |  |  |  | $ 0.15 |  |  |  |
Amount of dividend declared |  |  |  |  |  |  |  |  | 21,600,000 |  |  |
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 |  |  |  |  |  |  |  |  |  |  | 188,400 |
Average sales price per share |  |  |  |  |  |  |  |  |  |  | $ 12.23 | $ 12.50
Issuance of Common Shares of Beneficial Interest |  | $ 2,305,000 |  |  |  |  |  |  |  |  | $ 2,200,000 |
Common partnership units issued to the parent company related to redemption |  |  |  |  |  |  |  |  |  |  | 188,400 |
Number of shares sold by the company |  |  |  |  |  |  |  |  |  | 6,421,553 |  |
Remaining shares available for sales |  |  |  |  |  |  |  |  |  | 8,578,447 |  |
Common shares capacity restored |  |  | 3,500,000 |  |  |  |  |  |  |  |  |
Additional shares Expected to be purchased under program | 500,000 |  |  |  |  |  |  |  |  |  |  |

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