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Beneficiaries Equity of The Parent Company (DetailsTextuals) (USD $) | 3 Months Ended | 6 Months Ended |  | 0 Months Ended | 6 Months Ended | 0 Months Ended | 6 Months Ended |  |  | 6 Months Ended | 28 Months Ended | 0 Months Ended | 6 Months Ended |  | 6 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  | 6 Months Ended | 12 Months Ended
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Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | May 02, 2006 | May 03, 2012 7.50% Series C Preferred Shares | Jun. 30, 2012 7.50% Series C Preferred Shares | Jul. 16, 2012 7.375% Series D Preferred Shares | Jun. 30, 2012 7.375% Series D Preferred Shares | Jul. 19, 2012 7.375% Series D Preferred Shares Dividend Paid | Jul. 05, 2012 7.375% Series D Preferred Shares Dividend Paid | Jun. 30, 2012 Offering Program [Member] | Jun. 30, 2011 Offering Program [Member] | Jun. 30, 2012 Offering Program [Member] | Jul. 16, 2012 6.90% Series E Preferred Stock [Member] | Jun. 30, 2012 6.90% Series E Preferred Stock [Member] | Apr. 11, 2012 6.90% Series E Preferred Stock [Member] | Jun. 30, 2012 6.90% Series E Preferred Stock [Member] | Jun. 30, 2012 Subsidiaries [Member] | Jun. 30, 2011 Subsidiaries [Member] | Jun. 30, 2012 Subsidiaries [Member] | Jun. 30, 2011 Subsidiaries [Member] | Dec. 31, 2011 Subsidiaries [Member] | Jul. 19, 2012 Subsidiaries [Member] | Jul. 05, 2012 Subsidiaries [Member] | Jun. 30, 2012 Subsidiaries [Member] 7.50% Series C Preferred Shares | Jun. 30, 2012 Subsidiaries [Member] 6.90% Series E Preferred Stock [Member] | Dec. 31, 2011 Subsidiaries [Member] 6.90% Series E Preferred Stock [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Redeemed or Called During Period, Value |  |  | $ (47,910,000) |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock |  |  | 96,240,000 | 0 |  |  |  |  |  |  |  |  |  |  |  | 96,300,000 |  |  |  |  | 96,240,000 | 0 |  |  |  |  |  |
Stock Redeemed or Called During Period, Shares |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Preferential return |  |  |  |  |  |  |  |  | 7.375% |  |  |  |  |  |  | 6.90% |  | 6.90% |  |  | 6.90% |  | 0.00% |  |  |  | 7.375% | 7.375%
Dividends paid for preferred shares |  |  | 5,047,000 | 3,996,000 |  |  | 200,000 | 1,100,000 |  |  |  |  |  |  | 1,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption Premium | 2,090,000 | 0 | 2,090,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,090,000 | 0 | 2,090,000 | 0 |  |  |  | (2,100,000) |  |
Beneficiaries Equity of The Parent Company (Textuals) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share |  |  | 2,657,721 | 9,809,759 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 | 4,000,000 | 4,000,000 |  | 4,000,000 |  | 0 |  |  |  | 2,300,000 | 2,300,000
Distribution Declared per common partnership unit |  |  |  |  |  |  |  |  |  | $ 0.15 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.15 |  |  |  |
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 | $ 12.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Common Shares of Beneficial Interest |  |  |  | 8,272,000 |  |  |  |  |  |  |  |  | 8,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common partnership units issued to the parent company related to redemption |  |  |  |  |  |  |  |  |  |  |  |  | 679,285 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25 | $ 25 |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, per share per annum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.725 |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Amount |  |  |  |  |  |  |  |  |  |  | $ 21,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21,600,000 |  |  |

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